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Glossary

Cancer

Cancer is a collective name for diseases in which cells grow uncontrollably and can crowd out healthy tissue or spread elsewhere in the body. There are hundreds of types, each with its own approach.

Cancer is not a single disease, but a collective name for hundreds of different diseases. What they share: cells in the body divide uncontrollably and no longer keep to the normal rules. That is how a tumour can arise, a tangle of such cells.

How does it work?

Every cell has instructions in its DNA that determine when it may divide, and when it must stop or clear itself away. Errors in that DNA can break those instructions. Such errors arise by chance when cells divide, or through outside influences, such as smoking or sunlight. Usually the body clears away damaged cells. If that goes wrong once, a cell can keep dividing.

A tumour can crowd out healthy tissue. In some forms, cells break loose and spread to other places, which makes the disease harder to treat. Cancer cells can also hide from the immune system.

Because every kind of cancer is different, there are many treatments, such as surgery, radiotherapy, drugs and immunotherapy. Which one is suitable is decided by a doctor together with the patient.

Why it matters

Cancer affects many people, and researchers are looking for new approaches in many places. A large part of this concerns the immune system. In a large study of 1,137 people with melanoma, a dangerous form of skin cancer, a personalised mRNA vaccine reduced the chance of recurrence by 42 per cent (link). It was given alongside the usual treatment. An Australian team meanwhile found that a little-known kind of immune cell can recognise and kill small-cell lung cancer, even when it hides from the rest of the immune system (link). They saw this in the lab; research in patients now follows.

AI is helping too, for instance in assessing the disease. Researchers at Mass General Brigham built an AI that estimates, from a single ordinary photo of the face, how old someone's body is and how likely they are to survive cancer (link). More research comes first.

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