A neuroendocrine tumour is a rare tumour that can develop in many different organs of the body. It affects the cells that release hormones into the bloodstream (neuroendocrine cells).
Neuroendocrine tumours can be cancerous (malignant) or non-cancerous (benign). They often grow slowly, but not always.
The symptoms of a neuroendocrine tumour depend on where in the body it is and what hormones it produces.
A tumour in the lung (pulmonary neuroendocrine tumour) may cause wheezing or a persistent cough.
Some tumours may lead to abnormally large amounts of hormones being released into the bloodstream. These are known as "functioning tumours" and can cause symptoms such as diarrhoea, flushing, cramps, wheezing, low blood sugar (hypoglycaemia), changes in blood pressure and heart problems.
The cause of neuroendocrine tumours isn't fully understood. However, your chance of developing one is increased if you have one of the following inherited conditions:
Research suggests your risk of developing a neuroendocrine tumour is slightly increased if your father, mother, brother or sister has had any type of cancer.
Types of scans used include:
How a neuroendocrine tumour is treated will depend on your individual circumstances, such as:
Unfortunately, many people are only diagnosed after the tumour has spread to other parts of the body.
However, it may still be possible to use surgery to remove the tumour. If surgery can't completely cure your condition, it may be used to help reduce and manage any symptoms.
Medication called somatostatin analogues, such as octreotide or lanreotide, may be recommended. They stop your body producing too many hormones, and can reduce the severity of your symptoms and slow the condition's progression. You'll have an injection, usually once every 28 days.
It may also be possible to shrink the tumour or stop it growing using treatments that block its blood supply (embolisation), or using chemotherapy, radiotherapy or radiofrequency ablation (where heat is used to destroy the cells).
There are also two treatments – everolimus and sunitinib – that can be used to treat some neuroendocrine tumours in adults if:
Everolimus is taken as a tablet, and sunitinib is taken as a capsule.
The National Institute for Health and Care Excellence (NICE) has more information about everolimus and sunitinib.
Cancer Research UK also has more information about neuroendocrine tumours.