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Thymic carcinoma is a rare malignant tumor of the mediastinum, originating from thymic epithelial cells. The most common tissue types are squamous cell carcinoma and undifferentiated carcinoma. Thymic cancer exhibits significantly different malignant biological behavior from thymoma in terms of histological behavior. Thymic carcinoma is more common in adult males, with an average age of 50 years old. Among them, lymphocytic epithelial carcinoma can also be seen in children. Basal cell like carcinoma is more common in middle-aged and elderly males, and mucoepidermoid carcinoma and adenosquamous cell carcinoma can also be seen in middle-aged and elderly females.
Figure 1. Thymic Carcinoma.
Most patients present with chest pain or discomfort, and some may experience symptoms such as weight loss, night sweats, coughing, and difficulty breathing. If the tumor is large, there may be manifestations of superior vena cava obstruction. Most thymic cancer patients present with invasion or metastasis upon initial detection, usually involving surrounding organs or spreading to the mediastinal lymph nodes, unnamed veins, pleura, lungs, and pericardium. Individual patients may also exhibit some subsidiary symptoms of thymoma, such as systemic lupus erythematosus. Very few patients with thymic cancer may only be occasionally detected during physical examinations without any clinical symptoms. The clinical manifestations of thymic cancer are very similar to thymoma. In addition to the symptoms of mediastinal metastasis and rapid progression, there may also be extrathoracic metastasis.
| Examination Methods | Details |
| Immunohistochemical examination | It is the primary method for diagnosing thymic cancer and distinguishing it from malignant thymoma, lung cancer, and other malignant tumors. Most scholars have found through extensive research that monoclonal antibodies against cytokeratin are almost positively reactive with all thymic cancers, and the application of different cytokeratin monoclonal antibodies can help diagnose subtypes of thymic cancer. |
| EB virus antibody assay | At present, EBV antibody testing can be performed for the diagnosis of thymic lymphoid epithelial cancer. When suffering from thymic lymphoepithelial carcinoma, the antibody titer often increases significantly. |
| Chest X-ray Examination | The most common manifestation is a solid mass, with shadows mostly located in the thymus area of the anterior upper mediastinum. The size of the mass varies, the shape is often irregular, and the density is thick and uniform, which is a typical manifestation of a solid mass. If the lump protrudes to one side of the chest cavity, it can overlap with the pulmonary hilum and large vessel shadows. A few cases may show signs of sternum bone destruction. |
| CT Examination | It has important value in determining whether thymic cancer has invasion and the degree of invasion. It often presents as a circular or irregular mass in the anterior upper mediastinum, and can clearly indicate the degree of pleural or pericardial effusion. Enhanced CT scan can clearly display the relationship between the mass and large blood vessels, which has important reference value for the design of surgical plans. |
Due to the significant similarity between thymic cancer and anterior mediastinal metastatic adenocarcinoma of the nasopharynx, lungs, kidneys, genitals, and rectum. Unlike clear cells in the kidneys and female genitourinary organs, thymic clear cell carcinoma contains a large number of cytoplasmic tension filaments and structurally intact granulosomes, with a lack of microfilament formation and a large amount of glycogen. However, detailed clinical data defining primary extrathymic carcinoma must be considered for cases diagnosed with thymic carcinoma.
Similarities with large cell lymphoma in the thymic region. Generally, in thymic cancer, cytokeratin and EMA are positive while CLA is negative.
It is often differentiated through histopathological examination, but in occasional cases, electron microscopy and immunohistochemistry techniques are required. Testicular tumors without thymic carcinoma possess cytoplasmic tension filaments and structurally intact bridging bodies; On the other hand, testicular tumors have a large amount of cytoplasmic glycogen and complex nucleoli. Embryonic adenocarcinoma typically includes ultrastructural cytoplasmic AFP globules and lacks true tension filaments. From an immunohistochemical perspective, testicular tumors are positive for placental alkaline phosphatase, negative for EMA, and negative for cytokeratin.
Thymic cancer is a rare disease, and a standard treatment model has not yet been established. There is also limited research on prognostic factors that affect survival. For cases without extensive or distant metastasis, surgical resection is the best choice, and vascular reconstruction is feasible for cases involving invasion of the unnamed vein. Those who invade the pericardium and phrenic nerve should strive for simultaneous resection. For cases that are difficult to completely remove, palliative resection of the lesion can also reduce tumor burden. Widespread metastatic lesions can be identified through thoracotomy or thoracoscopic biopsy to determine the pathological type and guide radiotherapy and chemotherapy. The effects of preoperative and postoperative radiotherapy on thymic cancer are not yet clear, and it is generally believed that lymphocytic epithelial tumors are more sensitive to radiotherapy. The efficacy of postoperative adjuvant chemotherapy has not been determined yet.
| Cat. No. | Product Name | Size | Species Reactivity | Application | Detection Method | |
| DEIABL443 | anti-Titin-Antibody ELISA Kit | 96T | Human | Qualitative | Inquiry |
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