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LIVER
The liver is a vital organ present in vertebrates and some other animals. It has a wide range of
functions, including detoxification, protein synthesis, and production of biochemicals necessary for
digestion. The liver is necessary for survival; there is currently no way to compensate for the absence of
liver function.
This organ plays a major role in metabolism and has a number of functions in the body, including
glycogen storage, decomposition of red blood cells,plasma protein synthesis, hormone production, and
detoxification. It lies below the diaphragm in the thoracic region of the abdomen. It produces bile, an
alkaline compound which aids in digestion, via the emulsification of lipids. The liver's highly specialized
tissues regulate a wide variety of high-volume biochemical reactions, including the synthesis and
breakdown of small and complex molecules, many of which are necessary for normal vital functions.
ANATOMY
The liver is a reddish brown organ with four lobes of unequal size and shape. A human liver
normally weighs between 1.41.6 kg and is a soft, pinkish-brown, triangular organ. It is both the largest
internal organ (the skin being the largest organ overall) and the largest gland in the human body.
It is located in the right upper quadrant of the abdominal cavity, resting just below the
diaphragm. The liver lies to the right of the stomach and overlies the gallbladder. It is connected to two
large blood vessels, one called the hepatic artery and one called the portal vein. The hepatic artery
carries blood from the aorta whereas the portal vein carries blood containing digested nutrients from
the small intestine and the descending colon. These blood vessels subdivide into capillaries which then
lead to a lobule. Each lobule is made up of millions of hepatic cells which are the basic metabolic cells.
Figure 1 : Normal anatomy of the liver. CBD = common bile duct, CD = cystic duct, CHD = common
hepatic duct, HA = hepatic artery, IVC = inferior vena cava, LHA = left hepatic artery, LHD = left hepatic
duct, LHV = left hepatic vein, LPV = left portal vein, MHV = middle hepatic vein, PV = portal vein, RHA =
right hepatic artery, RHD = right hepatic duct, RHV = right hepatic vein, RPV = right portal vein.
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BILIARY FLOW
The term biliary tree is derived from the arboreal branches of the bile ducts. The bile produced
in the liver is collected in bile canaliculi, which merge to form bile ducts. Within the liver, these ducts are
called intrahepatic (within the liver) bile ducts, and once they exit the liver they are considered
extrahepatic (outside the liver).
The intrahepatic ducts eventually drain into the right and left hepatic ducts, which merge to
form the common hepatic duct. The cystic duct from the gallbladder joins with the common hepatic
duct to form the common bile duct. Bile can either drain directly into the duodenum via the common
bile duct or be temporarily stored in the gallbladder via the cystic duct. The common bile duct and the
pancreatic duct enter the second part of the duodenum together at the ampulla of Vater.
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JAUNDICE
Jaundice, (also known as icterus, attributive adjective: icteric) is a yellowish pigmentation of the
skin, the conjunctival membranes over the sclerae (whites of the eyes), and other mucous membranes
caused by hyperbilirubinemia (increased levels of bilirubin in the blood). This hyperbilirubinemia
subsequently causes increased levels of bilirubin in the extracellular fluids.
Bilirubin is a yellow chemical in hemoglobin, the substance that carries oxygen in your red blood
cells. As red blood cells break down, your body builds new cells to replace them. The old ones are
processed by the liver. If the liver cannot handle the blood cells as they break down, bilirubin builds up
in the body and your skin may look yellow.
Bilirubin is created by the activity of biliverdin reductase on biliverdin, a green tetrapyrrolic bile
pigment which is also a product of heme catabolism. Bilirubin, when oxidized, reverts to become
biliverdin once again. This cycle, in addition to the demonstration of the potent antioxidant activity of
bilirubin, has led to the hypothesis that bilirubin's main physiologic role is as a cellular antioxidant.
Tissue deposition of bilirubin occurs only in the presence of serum hyperbilirubinemia and is asign of either liver disease or, less often, a hemolytic disorder. The degree of serum bilirubin elevation
can be estimated by physical examination. Slight increases in serum bilirubin are best detected by
examining the sclerae which have a particular affinity for bilirubin due to their high elastin content.
The presence of sclera icterus indicates a serum bilirubin of at least 3.0 mg/dL. The ability to
detect scleral icterus is made more difficult if the examining room has fluorescent lighting. If the
examiner suspects scleral icterus, a second place to examine is underneath the tongue. As serum
bilirubin levels rise, the skin will eventually become yellow in light-skinned patients and even green if
the process is longstanding; the green color is produced by oxidation of bilirubin to biliverdin.
The differential diagnosis for yellowing of the skin is limited. In addition to jaundice, itincludes carotenoderma, the use of the drug quinacrine, and excessive exposure to phenols.
Carotenoderma is the yellow color imparted to the skin by the presence of carotene; it occurs in healthy
individuals who ingest excessive amounts of vegetables and fruits that contain carotene, such as carrots,
leafy vegetables, squash, peaches, and oranges. Unlike jaundice, where the yellow coloration of the skin
is uniformly distributed over the body, in carotenoderma the pigment is concentrated on the palms,
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soles, forehead and nasolabial folds. Carotenoderma can be distinguished from jaundice by the sparing
of the sclerae.
Another sensitive indicator of increased serum bilirubin is darkening of the urine, which is due to
the renal excretion of conjugated bilirubin. Patients often describe their urine as tea or cola colored.
Bilirubinuria indicates an elevation of the direct serum bilirubin fraction and therefore the presence of
liver disease.
Increased serum bilirubin levels occur when an imbalance exists between bilirubin production
and clearance. A logical evaluation of the patient who is jaundiced require understanding of bilirubin
production and metabolism.
Types of bilirubin
Unconjugated
Erythrocytes (red blood cells) generated in the bone marrow are disposed of in the spleen when they
get old or damaged. This releases hemoglobin, which is broken down to heme as the globin parts are
turned into amino acids. The heme is then turned into unconjugated bilirubin in the reticuloendothelial
cells of the spleen. This unconjugated bilirubin is not soluble in water. It is then bound to albumin and
sent to the liver.
Conjugated
In the liver it is conjugated with glucuronic acid by the enzyme Glucuronyltransferase, making it soluble
in water. Much of it goes into the bile and thus out into the small intestine. Some of the conjugated
bilirubin remains in the large intestine and is metabolised by colonic bacteria to urobilinogen, which is
further metabolized to stercobilinogen, and finally oxidised to stercobilin. This stercobilin gives feces its
brown color. Some of the urobilinogen is reabsorbed and excreted in the urine along with an oxidizedform, urobilin.
In urine
Normally, a tiny amount of bilirubin is excreted in the urine if any. If the livers function is impaired or
when biliary drainage is blocked, some of the conjugated bilirubin leaks out of the hepatocytes and
appears in the urine, turning it dark amber. The presence of this conjugated bilirubin in the urine can be
clinically analyzed, and is reported as an increase in urine bilirubin. However, in disorders involving
hemolytic anemia, an increased number of red blood cells are broken down, causing an increase in the
amount of unconjugated bilirubin in the blood. As stated above, the unconjugated bilirubin is not water
soluble, and thus one will not see an increase in bilirubin in the urine. Because there is no problem with
the liver or bile systems, this excess unconjugated bilirubin will go through all of the normal processing
mechanisms that occur (e.g., conjugation, excretion in bile, metabolism to urobilinogen, reabsorption)
and will show up as an increase in urine urobilinogen. This difference between increased urine bilirubin
and increased urine urobilinogen helps to distinguish between various disorders in those systems.
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Pre-hepatic : E.g. (hemolytic anemia due to malaria)
Laboratory findings include:
Urine: no bilirubin present, urobilirubin > 2 units (i.e., hemolytic anemia causes increased heme
metabolism; exception: infants where gut flora has not developed).
Serum: increased unconjugated bilirubin.
Kernicterus is associated with increased unconjugated bilirubin
Hepatic
Hepatic jaundice causes include acute hepatitis, hepatotoxicity and alcoholic liver disease, whereby cell
necrosis reduces the liver's ability to metabolize and excrete bilirubin leading to a buildup in the blood.
Less common causes include primary biliary cirrhosis, Gilbert's syndrome (a genetic disorder of bilirubin
metabolism which can result in mild jaundice, which is found in about 5% of the population), Crigler-
Najjar syndrome, metastatic carcinoma and Niemann-Pick disease, type C. Jaundice seen in the
newborn, known as neonatal jaundice, is common, occurring in almost every newborn as hepatic
machinery for the conjugation and excretion of bilirubin does not fully mature until approximately two
weeks of age.
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Laboratory findings include:
Urine: Conjugated bilirubin present, urobilirubin > 2 units but variable (except in children). Kernicterus is
a condition not associated with increased conjugated bilirubin.
Post-hepatic (OBSTRUCTIVE)
Post-hepatic jaundice, also called obstructive jaundice, is caused by an interruption to the drainage of
bile in the biliary system. The most common causes are gallstones in the common bile duct, and
pancreatic cancer in the head of the pancreas. Also, a group of parasites known as "liver flukes" can live
in the common bile duct, causing obstructive jaundice. Other causes include strictures of the common
bile duct, biliary atresia, ductal carcinoma, pancreatitis and pancreatic pseudocysts. A rare cause of
obstructive jaundice is Mirizzi's syndrome.
The presence of pale stools and dark urine suggests an obstructive or post-hepatic cause as normal feces
get their color from bile pigments. However, although pale stools and dark urine are a feature of biliary
obstruction, they can occur in many intra-hepatic illnesses and are therefore not a reliable clinicalfeature to distinguish obstruction from hepatic causes of jaundice.
Patients also can present with elevated serum cholesterol, and often complain of severe itching or
"pruritus".
Not one test can differentiate between various classifications of jaundice. A combination of liver
function tests is essential to arrive at a diagnosis.
TYPES OF JAUNDICE
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Diagnosis of jaundice
Most of the time jaundice is recognized by a yellowing of the skin and in the whites of the eyes. Also in
bowel movements may appear light in color since bilirubin is responsible for making stools dark. Urine
may become dark or brownish is color from bilirubin being excreted from the body through the urine.
One of the most serious side effects of jaundice is severe itching. The itching can become so severe thata person may not be able to control themselves from scratching.
Once jaundice is diagnosed it is important to determine the under-lying cause of the problem.
Sometimes the cause is already known and jaundice appears later as a side effect. Treating the jaundice
may be simple in some cases or difficult depending on the cause. Jaundice will only go away once the
original condition is treated.
Table of diagnostic test
Function test
Pre-hepatic
Jaundice Hepatic Jaundice Post-hepatic Jaundice
Total bilirubinNormal/
IncreasedIncreased
Conjugated bilirubin Normal Increased Increased
Unconjugated bilirubinNormal/
IncreasedIncreased Normal
UrobilinogenNormal/
IncreasedIncreased Decreased/ Negative
Urine Color Normal(urobilinogen) Dark (urobilinogen + conjugatedbilirubin) Dark (congujatedbilirubin)
Stool Color Normal Pale
Alkaline phosphatase
levels
Normal
Increased
Alanine transferase and
Aspartate transferase
levels
Increased
Conjugated Bilirubin in
Urine
Not Present Present
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Differential diagnosis of jaundice
OBSTRUCTIVE / MECHANICAL JAUNDICE
The liver plays a very important role in the human body. It produces around one liter of bile
every day, which helps the food get digested easily. The bile is stored in the gallbladder and it empties in
the upper intestine providing it with necessary bile. Any obstruction in this process causes obstructive
jaundice. Due the blockage the bile overflows into the blood and increase the level of bilirubin in the
blood. It can also causes various other infections in the body, so it is important to treat obstructive
jaundice as soon as possible.
One of the most frequent causes of obstructive jaundice is gallstones. Gallstones are pebble like
deposits in the gallbladder which occur when cholesterol and other things found in the bile become
hardened. Gallstones can be very tiny, almost too small to see, or they can be very large, nearing the
size of a golf ball. If a stone is too large it can cause an obstruction when it tries to pass through the bile
duct system. If the stone is not firmly stuck then the jaundice may not last very long however if it does
become lodged then you will develop symptoms of jaundice and other symptoms as well.
Another common cause of obstructive jaundice is tumors of the liver, pancreas or bile duct. Cancer of
the pancreas or liver can cause obstructive jaundice as well. Hepatitis, which is an inflammation of theliver caused by a virus, can cause obstructive jaundice and alcoholism is a big factor as well. Taking
certain medications can contribute to obstructive jaundice as can experiencing trauma to the liver area.
Primary biliary cirrhosis is a disease of the liver that slowly destroys the bile ducts. Sclerosing Cholangitis
is hardening and scarring of tissues of the bile duct caused by inflammation and Biliary Atresia is a
condition in which the bile ducts that carry the bile out of the liver are missing or damaged. Other
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causes of obstructive jaundice can include having parasites or worms, which is possible but rare, and
scarring to the liver from previous surgery.
SYMPTOMS
Due to increased levels of bilirubin in the blood the skin and eyes appear pale yellow in color.
Bilirubin also causes dark yellow color urine and pale colored stools. These are some of the obvious
obstructive jaundice symptoms. The other symptoms include:
Fever Weight loss Diarrhea smelly and bulky stools Upper abdominal pain Enlarged liver Enlarged spleen Malaise Itching skin Nausea
Once obstructive jaundice has been diagnosed treatment should begin immediately. Treatment
for obstructive jaundice includes surgical removal of the obstruction using a procedure called ERCP
(Endoscopic retrograde cholangiopancreatography). With this procedure you will be sedated and the
doctor will use an endoscope that will be inserted into your mouth, down your esophagus, into the
stomach and into the intestine looking for the blockage. Another procedure that can be used is
laparoscopic surgery which is where the surgeon makes one inch incisions to reach the obstruction.
Other treatment might be to cease all medications that are suspected in causing liver inflammation and
antibiotics may be started to treat infection. In cases of obstructive jaundice caused by cancer,
treatments may include chemotherapy, radiation and biliary drainage. Surgery is rarely used in these
cases. With biliary atresia a liver transplant may be necessary, especially in children.
Some complications of obstructive jaundice can include confusion, fatigue, and vitamin k
deficiency. Vitamin K deficiency can cause the blood to be unable to clot effectively which can then lead
to excessive bleeding and bruising. Cirrhosis of liver, acute liver failure, and brain disorders are caused
by the liver not filtering the waste products out of the blood properly. Malabsorption syndrome can be
another side effect of obstructive jaundice which means the body is not able to absorb nutrients
properly.
There are many reasons in which obstructive jaundice can cause serious harm to the body
therefore obstructive jaundice requires immediate medical attention.
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Gallbladder stones Pancreatic tumor
GALLBLADDER STONES
Gallstones are small, pebble-like substances that develop in the gallbladder. The gallbladder is a small,
pear-shaped sac located below your liver in the right upper abdomen. Gallstones form when liquid
stored in the gallbladder hardens into pieces of stone-like material. The liquidcalled bilehelps the
body digest fats. Bile is made in the liver, then stored in the gallbladder until the body needs it. The
gallbladder contracts and pushes the bile into a tubecalled the common bile ductthat carries it to
the small intestine, where it helps with digestion.
Bile contains water, cholesterol, fats, bile salts, proteins, and bilirubina waste product. Bile salts break
up fat, and bilirubin gives bile and stool a yellowish-brown color. If the liquid bile contains too much
cholesterol, bile salts, or bilirubin, it can harden into gallstones.
The two types of gallstones are cholesterol stones and pigment stones. Cholesterol stones are usually
yellow-green and are made primarily of hardened cholesterol. They account for about 80 percent of
gallstones. Pigment stones are small, dark stones made of bilirubin. Gallstones can be as small as a grain
of sand or as large as a golf ball. The gallbladder can develop just one large stone, hundreds of tiny
stones, or a combination of the two.
Gallstones can block the normal flow of bile if they move from the gallbladder and lodge in any of the
ducts that carry bile from the liver to the small intestine. The ducts include :
the hepatic ducts, which carry bile out of the liver cystic duct, which takes bile to and from the gallbladder common bile duct, which takes bile from the cystic and hepatic ducts to the small intestineIf any of the bile ducts remain blocked for a significant period of time, severe damage or infection
can occur in the gallbladder, liver, or pancreas. Left untreated, the condition can be fatal. Warning signs
of a serious problem are fever, jaundice, and persistent pain.
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Scientists believe cholesterol stones form when bile contains too much cholesterol, too much
bilirubin, or not enough bile salts, or when the gallbladder does not empty completely or often enough.
The reason these imbalances occur is not known.
The cause of pigment stones is not fully understood. The stones tend to develop in people who
have liver cirrhosis, biliary tract infections, or hereditary blood disorderssuch as sickle cell anemiain
which the liver makes too much bilirubin. The mere presence of gallstones may cause more gallstones
to develop. Other factors that contribute to the formation of gallstones, particularly cholesterol stones,
include:
Sex. Women are twice as likely as men to develop gallstones. Excess estrogen from pregnancy,
hormone replacement therapy, and birth control pills appears to increase cholesterol levels in bile and
decrease gallbladder movement, which can lead to gallstones.
Family history. Gallstones often run in families, pointing to a possible genetic link.
Weight. A large clinical study showed that being even moderately overweight increases the risk for
developing gallstones. The most likely reason is that the amount of bile salts in bile is reduced, resulting
in more cholesterol. Increased cholesterol reduces gallbladder emptying. Obesity is a major risk factor
for gallstones, especially in women.
Diet. Diets high in fat and cholesterol and low in fiber increase the risk of gallstones due to increased
cholesterol in the bile and reduced gallbladder emptying.
Rapid weight loss. As the body metabolizes fat during prolonged fasting and rapid weight losssuch as
crash dietsthe liver secretes extra cholesterol into bile, which can cause gallstones. In addition, the
gallbladder does not empty properly.
Age. People older than age 60 are more likely to develop gallstones than younger people. As people
age, the body tends to secrete more cholesterol into bile.
Ethnicity. American Indians have a genetic predisposition to secrete high levels of cholesterol in bile. In
fact, they have the highest rate of gallstones in the United States. The majority of American Indian men
have gallstones by age 60. Among the Pima Indians of Arizona, 70 percent of women have gallstones by
age 30. Mexican American men and women of all ages also have high rates of gallstones.
Cholesterol-lowering drugs. Drugs that lower cholesterol levels in the blood actually increase the
amount of cholesterol secreted into bile. In turn, the risk of gallstones increases.
Diabetes. People with diabetes generally have high levels of fatty acids called triglycerides. These fatty
acids may increase the risk of gallstones.
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Diagnosis of gallstones
Ultrasound examination-- the most sensitive and specific test for gallstones. A handheld device,which a technician glides over the abdomen, sends sound waves toward the gallbladder. The
sound waves bounce off the gallbladder, liver, and other organs, and their echoes make
electrical impulses that create a picture of the gallbladder on a video monitor. If gallstones are
present, the sound waves will bounce off them, too, showing their location.
Computerized tomography (CT) scan--The CT scan is a noninvasive x ray that produces cross-section images of the body. The test may show the gallstones or complications, such as infection
and rupture of the gallbladder or bile ducts.
Cholescintigraphy (HIDA scan)--The patient is injected with a small amount of nonharmfulradioactive material that is absorbed by the gallbladder, which is then stimulated to contract.
The test is used to diagnose abnormal contraction of the gallbladder or obstruction of the bile
ducts.
Endoscopic retrograde cholangiopancreatography (ERCP)--ERCP is used to locate and removestones in the bile ducts. After lightly sedating you, the doctor inserts an endoscopea long,
flexible, lighted tube with a cameradown the throat and through the stomach and into the
small intestine. The endoscope is connected to a computer and video monitor. The doctor
guides the endoscope and injects a special dye that helps the bile ducts appear better on the
monitor. The endoscope helps the doctor locate the affected bile duct and the gallstone. The
stone is captured in a tiny basket and removed with the endoscope.
Blood tests--Blood tests may be performed to look for signs of infection, obstruction,pancreatitis, or jaundice.
TREATMENT OF GALLSTONES
Surgery
If you have gallstones without symptoms, you do not require treatment. If you are having frequent
gallbladder attacks, your doctor will likely recommend you have your gallbladder removedan
operation called a CHOLECYSTECTOMY. Surgery to remove the gallbladdera nonessential organis
one of the most common surgeries performed on adults in the United States.
Nearly all cholecystectomies are performed with laparoscopy. After giving you medication to sedate
you, the surgeon makes several tiny incisions in the abdomen and inserts a laparoscope and a miniature
video camera. The camera sends a magnified image from inside the body to a video monitor, giving the
surgeon a close-up view of the organs and tissues. While watching the monitor, the surgeon uses the
instruments to carefully separate the gallbladder from the liver, bile ducts, and other structures. Then
the surgeon cuts the cystic duct and removes the gallbladder through one of the small incisions.
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Recovery after laparoscopic surgery usually involves only one night in the hospital, and normal activity
can be resumed after a few days at home. Because the abdominal muscles are not cut during
laparoscopic surgery, patients have less pain and fewer complications than after open surgery, which
requires a 5- to 8-inch incision across the abdomen.
If tests show the gallbladder has severe inflammation, infection, or scarring from other operations, thesurgeon may perform open surgery to remove the gallbladder. In some cases, open surgery is planned;
however, sometimes these problems are discovered during the laparoscopy and the surgeon must make
a larger incision. Recovery from open surgery usually requires 3 to 5 days in the hospital and several
weeks at home. Open surgery is necessary in about 5 percent of gallbladder operations.
The most common complication in gallbladder surgery is injury to the bile ducts. An injured common bile
duct can leak bile and cause a painful and potentially dangerous infection. Mild injuries can sometimes
be treated nonsurgically. Major injury, however, is more serious and requires additional surgery.
If gallstones are present in the bile ducts, the physicianusually a gastroenterologistmay use ERCP to
locate and remove them before or during gallbladder surgery. Occasionally, a person who has had a
cholecystectomy is diagnosed with a gallstone in the bile ducts weeks, months, or even years after the
surgery. The ERCP procedure is usually successful in removing the stone in these cases.
Nonsurgical Treatment
Nonsurgical approaches are used only in special situationssuch as when a patient has a serious
medical condition preventing surgeryand only for cholesterol stones. Stones commonly recur within 5
years in patients treated nonsurgically.
Oral dissolution therapy-- Drugs made from bile acid are used to dissolve gallstones. The drugsursodiol (Actigall) and chenodiol (Chenix) work best for small cholesterol stones. Months or
years of treatment may be necessary before all the stones dissolve. Both drugs may cause mild
diarrhea, and chenodiol may temporarily raise levels of blood cholesterol and the liver enzyme
transaminase.
Contact dissolution therapy.--This experimental procedure involves injecting a drug directly intothe gallbladder to dissolve cholesterol stones. The drugmethyl tert-butyl ethercan dissolve
some stones in 1 to 3 days, but it causes irritation and some complications have been reported.
The procedure is being tested in symptomatic patients with small stones.
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Cholecystectomy
PANCREATIC CANCER
The pancreas has two main types of cells, exocrine and endocrine. Each type can form different
malignancies or benign tumors. In addition, tumors can spread to the pancreas from other organs.
Advanced technology has helped physicians recognize more cystic tumors of the pancreas. Although
many tumors are benign, one cystic tumor the intraductal papillary mucinous neoplasm is
premalignant and warrants aggressive treatment.
Exocrine Cell Tumors
Pancreatic exocrine cells typically form adenocarcinomas, malignancies that start in the ducts of thepancreas. About 95 percent of pancreatic cancers develop from exocrine cells and are
adenocarcinomas. Other less common types of exocrine cell cancers include:
Mucinous noncystic carcinoma Adenosquamous carcinomas Mucinous cyst adenocarcinoma Intraductal papillary mucinous carcinoma
Physicians base treatment plans for exocrine pancreatic cancer on how far the cancer has spread,
rather than its exact type. Benign tumors of the exocrine cells are called cystadenomas.
Endocrine Cell Tumors
Tumors that form from endocrine cells of the pancreas are less common and more likely to be benign
than exocrine cell tumors. Known as neuroendocrine tumors or islet cell tumors, their name is based on
the hormone that they produce. Tumors that develop from endocrine cells that are not hormonally
active are called nonfunctioning islet tumors.
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SYMPTOMS OF PANCREATIC CANCER
Pancreatic cancer typically does not exhibit noticeable symptoms early in its development. The most
classic symptom is that of painless jaundice, which occurs because the tumor obstructs the bile duct
and causes yellow eyes and dark urine.
Pancreatic cancer symptoms can include:
Abdominal pressure Abdominal pain Yellowing of the eyes and skin Dark urine
As the cancer spreads, some people experience pain in the upper abdomen and back. Activities such as
eating or lying down may cause increased pain. Nausea, loss of appetite, weight loss and the onset of
diabetes may also be signs of pancreatic cancer.
One form of pancreatic cancer, islet cell cancer, can cause the pancreas to make excess insulin or other
hormones. Weakness, dizziness, chills, muscle spasms or diarrhea may result.
RISK FACTORS FOR PANCREATIC CANCER
Age (particularly over 60) Male sex (likeliness of up to 30% over females) Smoking. Cigarette smoking has a risk ratio of 1.74 with regard to pancreatic cancer; a decade of
nonsmoking after heavy smoking is associated with a risk ratio of 1.2.
Diets low in vegetables and fruits Diets high in red meat Diets high in sugar-sweetened drinks (soft drinks) risk ratio 1.87. In particular, common soft
drink sweetener fructose has been linked to growth of pancreatic cancer cells.
Obesity Diabetes mellitus is both risk factor for pancreatic cancer, and, as noted earlier, new onset
diabetes can be an early sign of the disease.
Chronic pancreatitis has been linked, but is not known to be causal. The risk of pancreatic cancerin individuals with familial pancreatitis is particularly high.
Helicobacter pylori infection Family history, 510% of pancreatic cancer patients have a family history of pancreatic cancer.
The genes responsible for most of this clustering in families have yet to be identified. Pancreatic
cancer has been associated with the following syndromes; autosomal recessive ataxia-
telangiectasia and autosomal dominantly inherited mutations in the BRCA2 gene and PALB2
gene, Peutz-Jeghers syndrome due to mutations in the STK11 tumor suppressor gene,
hereditary non-polyposis colon cancer (Lynch syndrome), familial adenomatous polyposis, and
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the familial atypical multiple mole melanoma-pancreatic cancer syndrome (FAMMM-PC) due to
mutations in the CDKN2A tumor suppressor gene.
Gingivitis or periodontal disease Alcoholism
DIAGNOSIS OF PANCREATIC CANCER
Effective treatment for pancreatic cancer depends on knowing whether the tumor is confined to the
pancreas or has spread to nearby organs, nerves or blood vessels.
Computed tomography (CT) scansMuch like high-definition TVs, the scanners produce exceptionally clear, sharp images throughout the
body with 33 percent greater detail than traditional scans. The improved imaging allows doctors to
diagnose disease earlier and with greater accuracy. More importantly, scan radiation can be reduced up
to 50 percent, a critical benefit for cancer patients.
Magnetic resonance cholangiopancreatography (MRCP)
in magnetic resonance colangiopancreatography (MRCP), which uses magnetic fields and radio waves to
produce detailed images of your pancreas, liver and bile ducts. This noninvasive test is especially helpful
for diagnosing bile duct obstructions and for detecting pancreatic cysts fluid-filled pockets that can
develop on or within the pancreas. Most cysts are benign, but some may become cancerous over time
and should be followed by physicians skilled in their management.
Endoscopic ultrasound (EUS)During the test, a tiny ultrasound probe is placed in your stomach through an endoscope. The probe
produces sound waves that create extremely detailed images of your pancreas, which lies next to the
stomach.
Digital analysis of these images can help distinguish cancer from chronic pancreatitis an ongoing
inflammation of the pancreas. During EUS, your doctor may also remove cellular material (fine needle
aspiration) or small samples of pancreatic tissue (core biopsy). Mayo is one of the few medical centers in
the world performing core biopsies of the pancreas. The biopsies can help distinguish autoimmune
pancreatitis from pancreatic cancer. Doctors can also collect pancreatic juices or fluid from
precancerous cysts for laboratory analysis. EUS can be technically demanding and produces the best
results when performed by an experienced endoscopist.
Endoscopic retrograde cholangiopancreatography (ERCP)ERCP is used to both assess and treat problems in the bile ducts. During a traditional ERCP, doctors injecta dye into the biliary tract through an endoscope before taking a series of X-rays. Traditional ERCP
doesn't allow direct observation of the ducts, however, and because X-rays may not provide enough
information for a complete diagnosis, some people may need repeat procedures.
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Treatment of pancreatic cancer
The rapid and aggressive spread of pancreas cancer into surrounding tissue, its resistance to standard
chemotherapy and its tendency to recur make it one of the most challenging cancers to treat. Surgery,
radiation, and palliative care may each be needed. For many people, managing symptoms is also a
critical part of care. The most appropriate options for you depend on the location and extent of the
cancer, your age, overall health and personal wishes.
Surgery
Surgery is the best option for people whose cancer can be safely and effectively removed. This usually
means that the tumor hasn't grown into any of the major blood vessels located near the pancreas or
spread to the liver, abdominal cavity or lungs.
Unfortunately, only about 20 percent of pancreatic cancer patients have tumors that can be surgically
removed (resected). And although improvements in diagnosis, staging, surgical techniques andpostoperative care have led to much better outcomes after surgery, pancreatic resection is still one of
the most difficult and demanding operations for both surgeons and patients.
1) Whipple procedure. Also known as pancreatoduodenectomy, the Whipple procedure is themost common surgery for pancreatic cancer. The surgery involves removing the "head" of the
pancreas the wide part of the pancreas next to the duodenum, the first part of the small
intestine.
To do that, surgeons must remove the duodenum, the gallbladder, the end of the common bile
duct and sometimes part of the stomach. The intestine, bile duct and remaining part of thepancreas are then reconnected. One not uncommon complication of this surgery is leaking of
pancreatic juices from the suture line. The leaking usually stops over time with no additional
treatment. Weight loss is another frequent complication of the Whipple procedure. On average,
patients lose about 7 percent of their pre-operative bodyweight after surgery. Because the
pancreas contains insulin-producing cells, diabetes is also a potential complication. Yet most
people who have normal blood sugar before surgery don't develop diabetes and those with
recently developed diabetes actually improve after surgery. In general, although many people
do very well after the Whipple procedure, up to a third may develop immediate complications
that affect their quality of life.
After pancreatic surgery, it will take some time before you can eat normally, and you may need
long-term treatment with pancreatic enzymes to help you digest food properly. Pancreatic
enzymes, nutrition counseling and supportive care are an integral part comprehensive
pancreatic cancer treatment.
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2) Minimally invasive surgery. In select cases, the Whipple procedure can be performed using aminimally invasive (laparoscopic) procedure. Although very successful in the right hands, this
technique requires great skill because the surgery is performed through a few small incisions
rather than a single large incision.
3) Central pancreatectomy--- which removes the center portion or body of the pancreas, whileretaining both ends (the head and tail). This procedure is performed in very few medical centers
in the United States and is generally used for early-stage benign tumors in the neck of the
pancreas a difficult area to treat without removing a large portion of the gland. By preserving
more of the pancreas and thus more of the cells that produce insulin and digestive enzymes
central pancreatectomy reduces the risk of diabetes and severe digestive problems.
4) total pancreatectomy, which removes the entire pancreas, along with the gallbladder, part ofthe stomach and small intestine, the bile duct, spleen, and nearby lymph nodes; and distal
pancreatectomy, in which the body and tail of the pancreas are removed.
Radiation therapy and multi-modality therapies
Radiation can be even be delivered during surgery using intraoperative radiation electron therapy,
Intraoperative radiation electron therapy allows doctors to treat tumors with high doses of radiation
the equivalent, in some cases, of 10 to 20 daily radiation treatments without harming nearby organs.
Palliative care
When cancer is so advanced that treatment options are limited, an experienced, integrated team of
palliative care providers serves the social, psychological and spiritual needs of patients and their
families. Your care team may include physicians from a number of fields as well as dietitians, medical
social workers, chaplains, psychologists, pharmacists and pain management specialists.
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PRIMARY BILIARY CIRRHOSIS
Definition
Primary biliary cirrhosis is a disease in which the bile ducts in your liver are slowly destroyed. Bile, a fluid
produced in your liver, is essential for the proper digestion of fats. It also helps rid your body of worn-out red blood cells, cholesterol and toxins. In primary biliary cirrhosis, the destruction of your bile ducts
can cause harmful substances to build up in your liver and sometimes lead to irreversible scarring of
liver tissue (cirrhosis).
The cause of primary biliary cirrhosis remains unclear. Many experts consider primary biliary cirrhosis
an autoimmune disease in which the body turns against its own cells, although it's likely that genetic and
environmental factors also play a part. Primary
biliary cirrhosis develops slowly. Medication
can slow the progression of the disease,
especially if treatment begins early.
SYMPTOMS
Early stage
Although some people with primary biliary
cirrhosis remain symptom-free for years after
they're diagnosed, others experience a number
of symptoms early in the disease:
Fatigue. A common symptom ofprimary biliary cirrhosis is fatigue, but
doctors haven't found any correlationbetween the degree of exhaustion and
the severity of the illness. This means that people with mild primary biliary cirrhosis and those
with more serious disease may be equally fatigued.
Itching. Another common symptom, itching (pruritus), is often most bothersome over your legs,arms and back. The severity of itching may change, often becoming worse at night and
improving during the day. Nighttime itching can disturb sleep, making fatigue worse and
sometimes leading to depression. The cause of this severe itching isn't clear.
Dry eyes and mouth (sicca syndrome). Sicca syndrome often occurs in people with otherautoimmune disorders. It causes inflammation in the moisture-secreting glands of the eyes and
mouth, resulting in the decreased production of tears and saliva.
Later stage
As the destruction of bile duct and liver cells progresses, other signs and symptoms may develop, such
as:
Jaundice. A common sign of advanced liver disease, jaundice turns your skin and the whites ofyour eyes yellow. The discoloration is due to high blood levels of bilirubin, a byproduct of the
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breakdown of the hemoglobin from old or damaged red blood cells. Normally, bile carries
bilirubin out of your liver so that it can be excreted from your body. But as more bile ducts are
destroyed and the flow of bile slows, bilirubin begins to build up in your blood and eventually
jaundice becomes visible in your skin and eyes.
Hyperpigmentation. Inadequate bile flow increases the production of the skin pigment melanin.This causes your skin to become darker, even in areas that aren't exposed to the sun.
Sometimes the deeper color isn't uniform, and your skin appears blotchy.
Swollen feet (edema) and abdomen (ascites). As liver damage progresses, your body begins toretain salt and fluids. At first, the excess salt and water accumulate mainly in your feet and
ankles (edema), which tend to become more swollen late in the day. In time, fluid can also
collect in your abdomen.
Cholesterol deposits (xanthomas). Your body uses bile as the main way of eliminating excesscholesterol. When disease interferes with this process, the amount of cholesterol in the blood
increases. This can lead to the formation of fatty deposits in the skin around your eyes, your
eyelids, or in the creases in your palms, soles, elbows or knees. These raised, waxy growths
usually don't appear until blood cholesterol reaches very high levels. Even then, not everyone
with primary biliary cirrhosis develops them.
Digestive problems. Because bile is essential for the digestion and absorption of fats, primarybiliary cirrhosis can cause intestinal problems. These include diarrhea and steatorrhea greasy,
bad-smelling stools that result from poor fat digestion.
CAUSES
The exact cause of primary biliary cirrhosis isn't known, but it appears to be an immune system disorder
that slowly destroys the bile ducts in your liver. Genetics and the environment also likely play a role in
this disease.
Normally, bile is excreted into canal-like spaces between your liver cells, which drain into an
interconnected series of thin tubes (ducts). The initial ducts are quite small, but become progressively
larger as they spread through your liver, much like the branches of a tree.
Origin of the condition
The problems in primary biliary cirrhosis begin with inflammation in the smallest ducts in your liver. In
time, the inflammation spreads to and destroys nearby liver cells. As these cells are destroyed, they're
replaced by scar tissue (fibrosis). Over a period of years, the combination of ongoing inflammation,
scarring and toxicity from trapped bile can lead to cirrhosis. Cirrhosis involves irreversible scarring of
liver tissue that makes it impossible for your liver to carry out essential functions.
The inflammation begins when T lymphocytes (T cells) begin accumulating in your liver. T cells are whiteblood cells that are part of your immune system response. Normally, T cells recognize and help defend
against bacteria and fungi. But in primary biliary cirrhosis, the T cells invade and destroy the cells lining
the small bile ducts. The T cells also produce chemicals that stimulate liver cells to secrete proteins that
attract more T cells, thereby creating an ongoing cycle of damage.
Researchers suspect that a genetic susceptibility coupled with an environmental trigger, such as
infection, may be at the root of this abnormal immune response:
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Genetics--Primary biliary cirrhosis seems to run in families, and scientists believe that some people may
inherit certain immune system defects that make them more susceptible to the disorder. Research has
identified three genetic variations associated with primary biliary cirrhosis. This finding may eventually
help researchers narrow in on the cause of primary biliary cirrhosis.
Infection--For decades, researchers have suspected that primary biliary cirrhosis might result from a
bacterial, fungal or parasitic infection, which would explain the massing of T cells in the small bile ducts.
Some women reported having urinary tract infections, primarily those caused by the Escherichia coli
bacterium, prior to the development of primary biliary cirrhosis. However, no commonplace infections
have yet been consistently linked to primary biliary cirrhosis.
RISK FACTORS
The following factors may increase your risk of primary biliary cirrhosis:
Your sex. More than 90 percent of people with primary biliary cirrhosis are women. Your age. Most people diagnosed with primary biliary cirrhosis are 35 to 60 years old. Although
older adults can develop the disease, it's rare in children.
Family history. Having a family history of primary biliary cirrhosis increases your risk ofdeveloping the disease.
COMPLICATIONS
As liver damage progresses, people with primary biliary cirrhosis may develop a number of serious
problems, including:
Cirrhosis. The term "primary biliary cirrhosis" isn't entirely accurate because cirrhosis develops only in
the later stages of the disease often many years after diagnosis. Yet when it does occur, cirrhosis can
be life-threatening because it interferes with your liver's ability to carry out essential functions. Cases ofprimary biliary cirrhosis are divided into four stages. The first stage inflammation of the bile ducts
is the least serious, and stage 4 cirrhosis the most serious. Ongoing cirrhosis can lead to liver
failure, which occurs when your liver is no longer able to function.
Increased pressure in the portal vein (portal hypertension). Blood from your intestine, spleen and
pancreas enters your liver through a large blood vessel called the portal vein. When scar tissue blocks
normal circulation through your liver, blood backs up, much like water behind a dam, leading to
increased pressure within the vein. And because blood doesn't flow normally through your liver,
hormones, drugs and other toxins aren't filtered properly before entering your bloodstream.
Enlarged veins (varices). When circulation through the portal vein is slowed or blocked, blood may backup into other veins mainly those in your stomach and esophagus. The blood vessels are thin walled,
and increased pressure in your veins can cause bleeding in your upper stomach or esophagus. This
bleeding is a life-threatening emergency that requires immediate medical care.
Liver cancer. The destruction of healthy liver tissue that occurs in cirrhosis increases your risk of liver
cancer.
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Weak bones (osteoporosis) . Liver scarring interferes with your liver's ability to process vitamin D and
calcium, both of which are essential for bone growth and health. As a result, weak, brittle bones and
bone loss may be complications of late-stage primary biliary cirrhosis, and your doctor may order a bone
density test to look for osteoporosis.
Vitamin deficiencies. A lack of bile affects the absorption of fats and of the fat-soluble vitamins, A, D, E
and K. This sometimes leads to deficiencies of these vitamins in advanced cases of primary biliary
cirrhosis.
Cognitive impairment. Some people with primary biliary cirrhosis have problems with memory and
concentration. Cognitive difficulties don't seem to correlate directly to the amount of liver damage,
however.
Other complications
In addition to bile duct and liver damage, people with primary biliary cirrhosis are likely to have other
metabolic or immune system disorders, including:
Thyroid disease. Thyroid problems are common in people with primary biliary cirrhosis. They may
appear long before bile duct damage is diagnosed, or thyroid disorders may develop after you've
received a diagnosis of primary biliary cirrhosis.
Limited scleroderma (CREST syndrome). This immune system disorder is a subset of scleroderma, a
disease that leads to thickening, tightening and hardening of connective tissue. CREST syndrome can
affect many body systems, including your blood vessels and esophagus, and sometimes your digestive
tract, lungs and heart. People with primary biliary cirrhosis generally have some, rather than all, of the
signs and symptoms of CREST.
Raynaud's phenomenon. One of the components of CREST, Raynaud's phenomenon may also occur inpeople with primary biliary cirrhosis. It occurs when small blood vessels (capillaries) spasm in response
to cold or emotional stress, blocking the flow of blood. The areas of affected skin generally turn white
before becoming blue, cold and numb. When circulation improves, the skin usually reddens and may
throb or tingle.
Rheumatoid arthritis. Some people with primary biliary cirrhosis have the aching joints that typify
rheumatoid arthritis, another autoimmune disorder.
TESTS AND DIAGNOSIS
Many people with primary biliary cirrhosis have no symptoms of the disease when they're initiallydiagnosed. Instead, doctors often become aware of a problem during routine blood tests or an
evaluation for another condition.
If your doctor suspects primary biliary cirrhosis, several tests can help make the diagnosis, including:
Liver function tests. These blood tests check the levels of enzymes that may indicate liverdisease in general and bile duct injury in particular. Certain liver enzymes are elevated in most
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people with primary biliary cirrhosis, especially alkaline phosphatase, which is produced in the
bile ducts.
Ultrasound imaging. This noninvasive test uses high-frequency sound waves to create preciseimages of structures within the body, including the bile ducts. It's sometimes used to rule out
other causes of bile flow blockage, such as gallstones or tumors.
Anti-mitochondrial antibodies (AMAs). Found in every cell, mitochondria are the prime energyproducers of your body. Antibodies are proteins in your blood that help destroy bacteria and
other harmful pathogens. Most people with primary biliary cirrhosis have anti-mitochondrial
antibodies antibodies that target enzymes in the mitochondria. These antibodies almost
never occur in people who don't have primary biliary cirrhosis, even if they have other liver
disorders. For that reason, a positive AMA test is considered a very reliable indicator of the
disease. At the same time, a small percentage of people with primary biliary cirrhosis don't have
AMAs. False-positive tests, which indicate a problem where none exists, also can occur. Because
an AMA test isn't entirely foolproof, doctors usually perform a liver biopsy, which can
definitively confirm the presence or absence of the disease.
Liver biopsy. In this test, a small sample of liver tissue (biopsy) is removed and examined in alaboratory, either to confirm the diagnosis or to determine the extent (stage) of the disease.
Doctors withdraw the tissue through a small incision using a thin needle. Doctors may take moreliver biopsies as time goes on to check the progression of the disease.
Magnetic resonance imaging (MRI) and magnetic resonance elastography (MRE). MRI is afrequently used imaging test that uses a powerful magnetic field and radio waves to produce
detailed images inside your body. When diagnosing primary biliary cirrhosis, MRI can be used to
detect abnormalities of your liver. MRE is a relatively new test that may help your doctor
diagnose primary biliary cirrhosis and may help avoid the need for a liver biopsy, which is more
invasive. MRE technology works by combining traditional magnetic resonance imaging with low-
frequency sounds waves. The MRI component shows the size and structure of your tissues and
organs. The low-frequency sound waves then help reveal physical properties of those tissues
and organs such as tissue stiffness. Stiffness of your liver may indicate cirrhosis.
TREATMENT
Treatments aimed at slowing the disease and prolonging life include:
1) Ursodeoxycholic acid (UDCA). Also known as ursodiol (Actigall), UDCA is a bile acid that helpsmove bile through your liver. Although UDCA doesn't cure primary biliary cirrhosis, it may
prolong life if started early in the disease and is commonly considered the first line of therapy.
It's less likely to help people with advanced liver damage. Side effects of UDCA may include
weight gain, hair loss and diarrhea.
2) Other drugs. Sometimes other drugs are used off-label or in clinical trials to treat primary biliarycirrhosis, but many have proved to have serious side effects or haven't been effective. For
example, some studies show that the drug methotrexate, which is normally used to treat
arthritis, psoriasis and some types of cancer, isn't helpful in primary biliary cirrhosis, whereas
others show it to be somewhat effective.
3) Liver transplant. When treatments no longer control primary biliary cirrhosis and the liverbegins to fail, a liver transplant may help prolong life. People with primary biliary cirrhosis who
have liver transplants often do very well, although the disease may recur in the new liver.