Testicular seminomatous germ cell tumor

Testicular seminomatous germ cell tumor, also known as testicular seminoma, is a malignant neoplasm arising from the germ cells of the testis. It is the most common single histological type of testicular germ cell tumor, accounting for approximately 40-50% of all testicular germ cell tumors. Seminomas originate from transformed gonocytes or undifferentiated spermatogonia within the seminiferous tubules and are frequently preceded by germ cell neoplasia in situ (GCNIS), formerly known as intratubular germ cell neoplasia. The disease primarily affects the male reproductive system, though advanced cases may metastasize to retroperitoneal lymph nodes, lungs, and other organs. The most common presenting symptom is a painless testicular mass or swelling, though some patients may experience testicular discomfort, heaviness in the scrotum, or dull aching in the lower abdomen or groin. Serum tumor markers, particularly elevated beta-human chorionic gonadotropin (beta-hCG) in some cases and lactate dehydrogenase (LDH), may be present, though alpha-fetoprotein (AFP) is characteristically not elevated in pure seminomas. Established risk factors include cryptorchidism (undescended testis), personal or family history of testicular germ cell tumor, testicular dysgenesis, and disorders of sex development. There is evidence of genetic susceptibility, with genome-wide association studies identifying multiple susceptibility loci including variants in KITLG, DMRT1, and other genes. Treatment is highly effective and depends on stage at diagnosis. Radical inguinal orchiectomy is the initial treatment for all stages. For early-stage disease, options include active surveillance, adjuvant radiotherapy, or single-agent carboplatin chemotherapy. Advanced-stage seminoma is treated with cisplatin-based combination chemotherapy, which achieves high cure rates. Overall, seminoma has an excellent prognosis, with five-year survival rates exceeding 95% for all stages combined.

Common questions about Testicular seminomatous germ cell tumor