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Thymoma and thymic carcinoma are rare cancers that develop in the thymus, a small organ located in the upper chest behind the breastbone. These tumours belong to a group known as thymic epithelial tumours, which arise from the lining cells of the thymus.
In many patients, early-stage disease does not cause noticeable symptoms. When symptoms appear, they are usually related to pressure on nearby structures in the chest or to immune-related conditions associated with the tumour. Treatment depends on tumour type, stage, and overall health, and may include surgery, systemic therapy or participation in clinical trials.
The thymus is part of the immune system and plays a role in the development of certain white blood cells known as T-cells. The gland contains epithelial cells and immune cells. Abnormal growth of epithelial cells can lead to thymoma or thymic carcinoma, while abnormal lymphocyte growth in the thymus region may lead to lymphoma.
Although both conditions originate in the thymus, they behave differently. Thymoma typically grows more slowly and is less likely to spread outside the chest. Thymic carcinoma is usually more aggressive and may spread earlier. Distinguishing between these tumour types is essential for planning treatment.
Thymoma is considered a rare cancer in Singapore. While uncommon overall, it is recognised as the most frequent tumour found in the anterior mediastinum (the front part of the chest cavity) in adults. Some patients with thymoma also have autoimmune conditions, most commonly myasthenia gravis, which affects muscle strength.
Early disease may not cause symptoms. As the tumour enlarges, it can affect nearby organs and nerves in the chest. Some patients also develop symptoms related to immune-system disturbances caused by the tumour.
When a thymic tumour presses on surrounding structures, symptoms may include:
If the tumour compresses the superior vena cava (a major vein returning blood to the heart), it may cause superior vena cava syndrome, which can lead to:
Some patients develop paraneoplastic syndromes linked to immune system changes. These may include:
Because symptoms can be mild or absent in early stages, medical review is recommended if persistent chest symptoms or unexplained fatigue occur.
Doctors begin with a clinical assessment and review of symptoms. If a thymic tumour is suspected, imaging tests and a biopsy are usually required.
Diagnostic tests and imaging options
May detect a mass in the chest and provide an initial assessment.
A CT scan of the chest is the primary imaging test used to evaluate thymic tumours. It helps determine tumour size, location, and possible spread.
MRI scans provide detailed images of surrounding tissues and may be used when additional information is needed.
A PET-CT scan helps identify active tumour areas and assess whether the cancer has spread to other parts of the body.
A biopsy confirms the diagnosis. A small sample of tumour tissue is examined to determine whether the tumour is thymoma or thymic carcinoma. In some cases, the tumour may be removed during surgery and analysed.
Accurate evaluation helps doctors:
Only a small number of risk factors are known.
Thymoma is more commonly diagnosed in middle-aged and older adults, particularly those aged 60 and above.
Some studies suggest thymoma may be slightly more common in Asian populations compared with Western populations, though it remains rare overall.
Most cases are not inherited and are not clearly linked to lifestyle factors.
Staging describes how far the tumour has spread and helps guide treatment.
Tumour confined to the thymus. Surgical removal is often associated with favourable outcomes, depending on tumour stage and overall health.
Tumour extends slightly beyond the thymus into nearby tissue. Surgery remains the main treatment and may be followed by radiotherapy.
Tumour involves nearby organs such as the lungs or blood vessels. Treatment may involve surgery combined with other therapies.
Cancer has spread within the chest cavity or to distant organs. Treatment usually involves a combination of therapies.
Treatment for thymoma or thymic carcinoma is tailored to each individual and depends on several factors, including the specific tumour type, stage of disease, and whether the cancer is newly diagnosed or has returned after previous treatment. Overall health and treatment goals are also considered when developing a care plan.
Treatment approaches may include:
Your doctor may also recommend involvement of a palliative care team at any stage of treatment. This multidisciplinary support focuses on managing symptoms, reducing treatment side effects, and improving quality of life throughout the cancer journey.
At OncoCare Singapore, our multidisciplinary team includes medical oncologists specialising in gastrointestinal and hepatobiliary cancers, liver surgeons experienced in advanced and minimally invasive procedures, radiation oncologists, radiologists, pathologists, oncology nurses, dietitians, and psycho-oncology counsellors. Together, they design an individualised treatment plan for every patient.
If you have risk factors or symptoms that may suggest liver cancer, seeking early consultation with our specialists is important. Timely diagnosis offers the best chance for effective treatment and improved outcomes.
