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Primary liver cancer is a disease in which malignant (cancer) cells arise from tissues in the liver. The different types of primary liver cancer are usually named after the types of cells from which it is thought the cancer has developed. Hepatocellular carcinoma (HCC) or hepatoma arises from the main cells of the liver called hepatocytes and accounts for about 85% of primary liver cancers. A less common type of primary liver cancer originates from cells that line the bile duct called cholangiocytes and is therefore called cholangiocarcinoma or bile duct cancer.
The liver is also the seat of another type of cancer called secondary (or metastatic) liver cancer. In this condition, the main cancer originates elsewhere in the body and secondary deposits are formed in the liver. A common example is colorectal cancer spreading to the liver via the bloodstream.
The three main risk factors for developing HCC (the most common primary liver cancer) are chronic hepatitis B infection, chronic hepatitis C infection and excessive alcohol consumption. The risk of an individual with chronic hepatitis B infection developing HCC is 100-fold that of an uninfected individual.
Other less common risk factors include aflatoxin (a poison found in mouldy peanuts, wheat, soya and grain), inherited conditions (e.g. haemochromatosis, alpha-1 anti-trypsin deficiency) and any cause of cirrhosis (scarring throughout the liver) like autoimmune hepatitis or primary biliary cirrhosis. Many liver cancers can be prevented by public health measures that reduce exposure to these known risk factors.
Patients who develop HCC usually have no symptoms other than those related to their chronic liver disease. With worsening symptoms of the existing chronic liver disease like abdominal distension with fluid (ascites), encephalopathy (altered mental state), jaundice, or gastro- instestinal tract bleeding may heighten the suspicion of development of HCC. Besides that, some patients may have mild to moderate upper abdominal pain, weight loss, early satiety, lethargy, anorexia or a palpable mass in the upper abdomen.
Screening can help doctors find and treat HCC early, when the cancer is localised and more easily removed by surgery. This may in turn improve the chance of survival. Those with chronic hepatitis B infection and liver scarring (cirrhosis) due to hepatitis C or other causes are at increased risk and should be screened for liver cancer.
The following tests and procedures may be performed to diagnose HCC and to show the stage of the cancer:
Although a diagnosis of HCC can be made based on the amount of AFP in the blood and on dedicated CT or MRI scans, a liver biopsy may sometimes be needed to be sure of the diagnosis. If the cancer has not already spread and if there is a chance it can be removed, then a biopsy might not be performed.
This is due to the small risk of the cancer spreading along the path of the needle when the biopsy needle is removed.
In this situation, the diagnosis is confirmed after an operation to remove the tumour.
The type of treatment for patients with HCC will depend on its stage (that is, its size and whether it has spread beyond its original site) and the patient’s general health. The main treatments used are surgery, tumour ablation, chemotherapy, targeted cancer therapy and radiotherapy.
Surgery is potentially curative and is therefore the treatment of choice for patients with early stage HCC. If only certain parts of the liver are affected by cancer and the rest of the liver is healthy, then surgery may be possible to remove the affected part or parts. This type of surgery is called a liver resection. Another form of surgery is a liver transplant. This involves the removal of the entire liver and replacement with a healthy donated liver. Such a major operation maybe performed when the cancer is in the liver only and a donated liver is available. If surgery is not possible, then other treatments may be offered to help control the cancer, thereby reducing symptoms and improving quality of life.
Tumour ablation aims to destroy primary liver cancer cells using either heat (radiofrequency ablation; RFA) or alcohol (percutaneous ethanol injection; PEI). This procedure is usually done in the scanning department so that ultrasound or computerised tomography (CT) can help the doctor to guide a needle through the skin and into the cancer within the liver. A local anaesthetic will be given. RFA treatment uses laser light or radio waves passed through the needleto destroy cancer cells by heating them to a very high temperature. PEI treatment uses alcohol injected through the needle into the cancer to destroy the cancer cells. Tumour ablation may sometimes be repeated if the tumour grows again.
Chemotherapy is the use of anti-cancer drugs to destroy cancer cells or stop them from dividing. It can help to control symptoms by shrinking the cancer and slowing its progression. Chemotherapy drugs are usually given as injections into the vein (intravenously), although they can sometimes be given as tablets.
Chemotherapy may also be administered as part of a treatment called chemoembolisation. Chemoembolisation involves the injection of chemotherapy drugs directly into the cancer in the liver, together with a gel or tiny plastic beads to block blood flow to the cancer (embolisation).
Not everyone is suitable for chemotherapy as it can only be given if the liver function is good enough.
An important part of the immune system is the ability to recognise foreign from normal cells. Immunotherapy isa relatively new form of therapy where patients receivea medication targeted at a receptor called the Program death protein 1(PD1) or programmed death ligand 1(PD- L1). These are known as checkpoint inhibitors. These drugs stimulate the immune cells called T lymphocytes to attack the cancer cells. A couple of immunotherapy drugs (both PD1 inhibitors) have been shown to be useful in liver cancer and more clinical trials are underway.
Targeted cancer therapy uses drugs or other substances that block the growth and spread of cancer by interfering with specific molecules involved in cancer growth and progression. There are a few targeted drugs available to treat liver cancer. These drugs targets cancers by stopping them from growing their own blood vessels. As cancer cells need a blood supply to bring nutrients and oxygen, this drug may therefore limit the cancer’s ability to develop. Indeed, these drugs has been demonstrated in large clinical studies to prolong survival in patients with advanced HCC, compared with supportive care alone.
Radiotherapy uses high-energy rays to destroy cancer cells or keep them from growing. External radiotherapy uses a machine outside the body the deliver radiation towards the cancer. Such treatment is not often used to treat HCC because the liver cannot take very high doses of radiation. It may however be used to relieve pain, for example, in patients whose cancer has spread to the bone. Alternatively, internal radiation uses a radioactive substance delivered selectively to the cancer via a major blood vessel that carries blood to the liver (hepatic artery).
Yes. There are several things we can do to prevent liver cancer. These include:
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