What is a BCOR-Internal Tandem Duplication (ITD) Sarcoma?
BCOR-Internal Tandem Duplication Sarcoma is a very rare type of cancer that develops due to a change in a gene called BCOR. Genes normally control how cells grow and function, but in this condition, a part of the BCOR gene is abnormally repeated. This repetition is called “internal tandem duplication.” Because of this change the normal control of cell growth is lost and cells begin to grow in an uncontrolled way, forming a tumour.
This tumour is now considered a separate and distinct disease, different from other BCOR-related tumours. It mainly affects soft tissues such as muscles and connective tissue, but in some cases it can also develop inside the body in organs like the abdomen or chest.
Incidence
This tumour is very rare and is most commonly seen in infants and young children. However, it can also occur in older children and adults. Since it is a newly recognised tumour type, exact numbers and statistics are still limited.
Symptoms
Symptoms depend on where the tumour is located. If it develops in soft tissues, a lump or swelling may be noticed, which may or may not be painful. The lump can increase in size over time.
If the tumour is inside the body, symptoms can be different. For example, a tumour in the abdomen may cause swelling, pain or a feeling of fullness. If it affects the chest, it may lead to breathing difficulty or cough. In some cases the tumour may grow quickly and cause pressure on nearby structures, leading to discomfort or functional problems.
Diagnosis
Imaging tests such as MRI or CT scans are used to locate the tumour and understand its size and extent. A biopsy is necessary to confirm the diagnosis, where a small sample of tissue is examined under a microscope. Special genetic testing plays a very important role as it detects the BCOR internal tandem duplication, which confirms the exact type of tumour.
Treatment
Treatment usually includes surgical removal of the tumour. In many cases, chemotherapy is also given, especially if the tumour is aggressive or has spread. Radiotherapy may be used in certain situations depending on the location and response to treatment.
Prognosis
The outcome varies from patient to patient. Some cases respond well to treatment, especially when the tumour is detected early and completely removed. However, more aggressive cases may come back or spread to other parts of the body. Because of this, regular follow-up and monitoring are very important to check for any recurrence.
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