What is a CIC-DUX4 sarcoma?
CIC-DUX4 sarcoma is a very rare and aggressive type of soft tissue cancer. It develops because of a specific genetic change inside the tumour cells. In this condition, two genes called CIC and DUX4 join together abnormally, which is known as a gene fusion. This fusion disturbs the normal control of cell growth and causes the cells to grow very fast and in an uncontrolled way.
In the past, doctors often confused this tumour with Ewing sarcoma because both can look similar under the microscope. However, modern testing has shown that CIC-DUX4 sarcoma is a different disease and usually behaves more aggressively. It most commonly develops in deep soft tissues such as muscles, but in some cases, it can also involve other areas of the body.
Incidence
This cancer is very rare and only a small number of cases have been reported worldwide. It is most commonly seen in young adults, but it can occur in older individuals as well. It usually affects areas like the arms, legs, or the trunk of the body.
Symptoms
The most common symptom is a rapidly growing lump or swelling. Unlike many slow-growing tumours, this lump increases in size quickly over a short period of time. The lump may become painful as it grows larger. If it presses on nearby muscles, nerves, or joints, it can cause discomfort, difficulty in movement or weakness in the affected area.
In more advanced stages, patients may also experience general symptoms such as unexplained weight loss, tiredness or weakness, which are common in many types of cancer.
Diagnosis
Diagnosis begins with imaging tests such as MRI or CT scans to identify the size and location of the tumour. However, a biopsy is necessary to confirm the diagnosis. In this test, a small piece of the tumour is removed and examined under a microscope. Special molecular tests are very important, as they detect the CIC-DUX4 gene fusion, which confirms the exact diagnosis.
Treatment
Treatment usually involves a combination of surgery, chemotherapy, and sometimes radiotherapy. Surgery is done to remove as much of the tumour as possible. Because this tumour is aggressive, strong treatment is required, similar to other high-grade sarcomas.
Prognosis
The prognosis is generally not very good compared to many other sarcomas. This tumour tends to grow quickly and can spread to other parts of the body, especially the lungs. However, early diagnosis and proper aggressive treatment can improve the chances of survival. Regular follow-up is very important to monitor for recurrence or spread.
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