A look at Cancer

Sunday, January 14, 2018

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What is cancer?

Cancer is a disease of the body's own cells. Our bodies are made up of billions of cells and each one has a specific role to play. We are complex beings and there are many different types of cells – liver cells, brain cells, blood cells, and so on. Normally these cells are kept in check so that they only grow and divide when they are told to – such as when old cells need replacing or an organ needs repairing. In cancer these molecular checks are broken so cells are no longer kept under strict control. This can cause them to divide uncontrollably, ultimately leading to a mass of cells known as a tumour — the physical manifestation of the disease we call cancer.

What causes cancer?

The causes of cancer are complex, but the underlying biological reason is mutations or mistakes to the genetic code contained within a cell's DNA. These mutations are caused by a variety of factors, including things from inside and outside the body, as well as just by chance when a cell is going about its normal routine.

Some of the environmental or external factors that can cause these mutations are well known, such as tobacco smoking or too much sun exposure. Inside the body, certain chemicals produced through normal biological processes can also contribute to mutations in the genetic code.

What are the signs and symptoms of cancer?

The signs and symptoms of cancer are different depending on the type of cancer. This is primarily down to where in the body the cancer is located. For example, colon cancer, which occurs in the large intestine, can cause long-term diarrhoea or constipation, rectal bleeding and persistent intestinal cramps.

What are the most common cancers?

The 10 most common cancers worldwide are:

1.Lung cancer

2.Breast cancer

3.Colon cancer

4.Prostate cancer

5.Stomach cancer

6.Liver cancer

7.Cervical cancer

8.Oesophagus cancer

9.Bladder cancer

10.Non-Hodgkin lymphoma (a type of blood cancer)

What are the most deadly cancers?

Pancreatic cancer and lung cancer are the cancers with the lowest survival rates. But what is pancreatic cancer and why is it so deadly?

Pancreatic cancer is a type of cancer that is caused by cells in the pancreas dividing out of control and forming a mass of cells or a tumour. Symptoms of pancreatic cancer are not normally recognisable in the early stages of the disease, resulting in late diagnosis in many cases. This is one of the main reasons why survival rates for pancreatic cancer are among the worst for all cancers. Pancreatic cancer is curable if caught at an early stage and the tumour is removed before the cancer cells have had chance to spread to other organs in the body.

Lung cancer is a type of cancer that begins with cells of the lung tissue diving out of control and forming tumours. Like pancreatic cancer, the symptoms of lung cancer often don't appear until later in the disease, when it is much harder to treat and deadlier. Around 85 per cent of lung cancers are caused by long-term tobacco smoking and symptoms of lung cancer can include things like coughing blood, wheezing, weight loss, and chest pains. Consult your doctor if you are at all concerned about you're the health of your lungs.

What can you do to prevent cancer?

Research in uncovering more and more things that people can do to help reduce their risk of cancer. There are activities that we know for sure can help reduce your risk including not smoking tobacco, maintaining a healthy body weight, regular exercise, and eating a healthy diet.

What is cancer metastasis?

Metastasis is the scientific word that describes the process by which cancer cells from a tumour, spread to other parts of the body. The originating tumour is called a primary tumour and new tumours that appear elsewhere in the body and are seeded by cells from the primary tumours are referred to as secondary tumours. Secondary tumours are the same type of cancer as the primary. For example, a primary breast tumour is made up of breast tissue cells. If this cancer spreads and tumours appear in the lungs, these new tumours are secondary breast tumours and not lung tumours. This is because the cells that make up the tumour in the lung are still breast cancer cells.

— Worldwide Cancer Research

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