What is NTRK-Rearranged Spindle Cell Neoplasm?
NTRK-Rearranged Spindle Cell Neoplasm is a rare type of soft tissue tumour. It develops because of a change (fusion) in a gene called NTRK. This genetic change causes cells to grow and divide abnormally, leading to the formation of a tumour.
These tumours can occur in different parts of the body, especially in the arms, legs, head, neck, and trunk. They can affect both children and adults but are more common in children and young people.
Causes
The main cause is a genetic change called an NTRK gene fusion.
Normally, NTRK genes help control cell growth and the development of nerves. When part of an NTRK gene joins with another gene, it creates an abnormal protein that continuously sends growth signals to cells. As a result, the cells grow uncontrollably and form a tumour.
Doctors do not yet know why this genetic change occurs in some people.
Signs and Symptoms
Symptoms depend on the size and location of the tumour.
Common symptoms may include:
- A painless lump or swelling under the skin
- A growing mass in the soft tissues
- Pain or discomfort if the tumour presses on nearby nerves or organs
- Reduced movement in the affected area
- Weakness or numbness in nearby tissues
- Fatigue in some patients
If the cancer spreads to other parts of the body, symptoms may vary depending on the affected organ.
Diagnosis
Physical Examination
A doctor will examine the lump or swelling and ask about symptoms.
Imaging Tests
Scans may be used to determine the size and location of the tumour, including:
- MRI scan
- CT scan
- PET scan
Biopsy
A small sample of the tumour is removed and examined under a microscope.
Laboratory Testing
Special tests are performed on the tumour tissue, including:
- Immunohistochemistry (IHC)
- Molecular testing
- Next-Generation Sequencing (NGS)
- FISH testing
These tests help confirm the presence of an NTRK gene fusion, which is required for a definite diagnosis.
Treatment
Surgery
Surgery is usually the first treatment. Doctors try to remove the entire tumour whenever possible.
Radiation Therapy
Radiation may be used after surgery or when surgery is not possible.
Chemotherapy
Some patients may receive chemotherapy, depending on the type and stage of the tumour.
Targeted Therapy
Patients with NTRK gene fusions may benefit from special medicines called TRK inhibitors, which directly target the abnormal protein causing the cancer.
Examples include:
- Larotrectinib
- Entrectinib
These medicines have shown very good results in many patients, often shrinking tumours quickly and effectively.
Prognosis
The outlook depends on the tumour’s size, location, and whether it has spread to other parts of the body.
Some NTRK-Rearranged Spindle Cell Tumours grow slowly and behave less aggressively, while others can be more aggressive and spread to distant organs such as the lungs.
Early diagnosis and appropriate treatment, especially with targeted TRK inhibitor therapy when suitable, can significantly improve outcomes for many patients.
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