Pancreatic cancer is one of the worst cancers which affect the human body. It is difficult
to detect early, and treatment failures are common. So it is easy to acknowledge the gloomy prognosis associated
with this disease.
The pancreas
The pancreas is
a long leaf shaped organ, almost resembling a flattened obelisk. The broad end
is called the head, the tapering point called the tail and the intervening part
called the neck and body. It lies transversely in front of the spine in the abdomen.
The head end is situated on the right side and the tail on the left, touching the
spleen. The common bile duct runs through the head, on its way from the liver to
the intestines. The pancreas produces a plethora of digestive enzymes which are secreted
into the gut. In addition, it produces the hormone insulin, the lack of which
causes diabetes mellitus.
The most common
cancer that arises in the pancreas is the adenocarcinoma, which carries the
worst prognosis. The main risk factors are smoking, excessive alcohol
consumption, obesity and diabetes mellitus. There is also a strong relation to
chronic pancreatitis and a family history of cancer. Hence this cancer can be
guarded against by lifestyle modifications, such as cessation of smoking,
change in drinking habits, regular exercise and a healthy lifestyle.
Signs and symptoms
The initial
signs and symptoms of this disease are very nonspecific and emulate everyday
troubles like indigestion and acidity. However, cancer of the pancreatic head
announces itself comparatively early by blocking the common bile duct and thus
causing jaundice, which is initially painless. Hence any painless jaundice should
be immediately investigated with an abdominal ultrasound. Cancer of the other
parts of the pancreas do not cause jaundice and are consequently diagnosed even
later. They usually cause severe abdominal pain spreading to the back, weight
loss, vomiting and onset diabetes.
Diagnosis
Diagnosis is
done by imaging, such as CT scan, MRI, CT guided fine needle biopsy (FNAC) and
a blood test to detect a specific
protein called CA 19.9, the level of which is elevated in pancreatic cancer. It
is not always possible to do preoperative biopsy or FNAC successfully, and it
frequently happens that the surgeon decides to operate on clinical and radiological
suspicion alone. During the operation, a frozen section biopsy is used to
confirm the disease.
Upon diagnosis,
the fate of the affected person hinges on whether the cancer is limited to the
pancreas and, if so, whether it can be surgically removed. Like most other
solid cancers, surgery is the keystone to the treatment of this cancer. If the
cancer has spread to other distant organs such as the liver, it is in the incurable
stage and the average survival of these patients is 6 to 9 months from diagnosis.
Anticancer chemotherapy drugs can be used to ameliorate the painful symptoms,
but it does not increase survival at this stage. If the cancerous tumour is not
limited to the pancreas but has extended to involve surrounding vital
structures, then it is inoperable, which means it cannot be surgically removed.
These patients are treated with a combination of chemotherapy and radiotherapy,
which can give an extended survival of
42 to 60 weeks.
If the tumour is
limited to the pancreas and is operable, then surgery carries the best chance
of cure. The operation varies according to where the tumour is located. If it
is in the head of the pancreas, then the surgery is called a Whipple procedure (pancreaticoduodenectomy).
This is a long and complicated surgery carrying significant chance of
post-operative complications and even death, up to 5 per cent.
If successful,
it carries a 5 year survival rate of 20 per cent, which means that 20 per cent
of patients are likely to live more than 5 years. The average survival of these
patients is 19 months. If the tumour is in the mid-part or body of pancreas, it
is rarely operable, but sometimes a total pancreatectomy or removal of whole pancreas
can be done. For cancers in the tail of the pancreas, a distal pancreatectomy
operation with removal of the spleen is done.
Of all the
patients diagnosed with pancreatic cancer, 80 per cent are inoperable at
diagnosis. Surgery is also not a guarantee of cure. Thus it is apparent that
treatment options for this disease are limited, even when detected relatively
early. Research is ongoing to find better options. As of now, it appears that prevention
is better than cure, and therein lies the importance of a healthy lifestyle.

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