7 rare kinds of cancer

Rare cancers may be difficult to diagnose and treat.
Rare cancers may be difficult to diagnose and treat.

According to Cancer Research UK there are more than 200 different types of cancer, which develop when different types of cells in different parts of the body divide in an uncontrolled way.

Some cancers, like breast, bowel, prostate and lung cancer are common, others are less common and some are classified as rare.

22% of all cancers are rare

Rare Cancers Europe explains that rare cancers can be identified as those with an incidence of less than six per 100 000 persons per year. (Less common cancers have between six and 12 incidences per year per 100 000 population.)

Rare cancers can also be classified in the group of rare diseases, which is defined in the EU (European Union) as diseases with a prevalence of fewer than five cases out of a population of 10 000.

According to the Radboud Institute for Molecular Life Sciences (RIMLS), rare cancers (i.e. incidence less than six per 100 000), represent about 22% of all cancer cases.

The low frequency of these cancers poses challenges because of:

  • Late or incorrect diagnosis
  • Lack of access to appropriate therapies and clinical expertise
  • A very limited number of clinical trials due to the small number of patients
  • Lack of interest in the development of new therapies due to limitations in the market
  • Few available registries and tissue banks

7 types of rare cancers:

1. Head and neck cancer

Cancers known as head and neck cancers usually begin in the squamous cells that line the mucosal surfaces inside the head and neck (e.g. mouth, the nose and throat). Cancers of the head and neck can be categorised by the area where they begin, e.g. the oral cavity, pharynx, larynx, paranasal sinuses and nasal cavity and salivary glands.

2. Sarcoma

Sarcoma arises in the connective tissue of the body, i.e. fat, blood vessels, nerves, bones, muscles, deep skin tissues and cartilage. This type of cancer is divided into either bone sarcomas or soft tissue sarcomas  all share certain microscopic characteristics and have similar symptoms.

3. Thyroid cancer

Throid cancer is a rare type of cancer that affects the thyroid gland, a small gland at the base of the neck that produces hormones. Symptoms include a painless lump or swelling in the front of the neck, swollen glands in the neck, unexplained hoarseness, a lingering sore throat and difficulty swallowing.

4. Neuroendocrine cancer

A neuroendocrine tumour begins in the hormone-producing cells of the body’s neuroendocrine system. Neuroendocrine cells are found in organs like the lungs and gastrointestinal tract, including the stomach and intestines.

5. Brain tumours

Cancerous brain tumours are high-grade tumours that either start in the brain (primary tumours) or spread into the brain from elsewhere (secondary tumours). Symptoms include severe, persistent headaches, seizures, persistent nausea, vomiting and drowsiness, mental or behavioural changes, vision or speech problems, progressive weakness or paralysis on one side of the body.

6. Lymphoma

Lymphoma occurs when lymphocytes (white-blood cells) get out of control. They divide in an abnormal way or don’t die when they should. Abnormal lymphocytes can collect in your lymph nodes, often in your armpits, neck or groin, but they can collect in almost any part of your body. Symptoms will depend on where the lymphoma starts and what parts of your body is affected.

7. Paediatric (childhood) cancer

The most common cancers in children include leukaemia, lymphoma and brain cancer. Things that cause cancer in adults (e.g. smoking or exposure to environmental toxins) are usually not the same as in children. In most cases childhood cancers come from random mutations in the genes of growing cells, which means that there’s often no effective way to prevent them.

Image credit: iStock

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