BACKGROUND: Germ cell tumors (GCTs) primarily affect adolescent and young adult men. Detailed clinical and treatment characteristics in older men are lacking. METHODS: Patients with GCT seen over a 20-year period at Memorial Sloan-Kettering Cancer Center were identified. Primary tumor site and histology were compared for patients aged 50 years at diagnosis versus younger men. For patients aged 50, individual chart review was performed and treatment delays, changes, and toxicities were recorded for those treated with first-line chemotherapy. RESULTS: Of 4235 diagnoses of GCT, 3999 (94.4%) were made at age < 50 versus 236 (5.6%) at age 50. Compared with patients diagnosed before age 50, older men more frequently had seminoma (62.7% versus 36.7%) and less frequently, nonseminoma (34.7% versus 63.2%) (P <.0001). Predominant histology switched from nonseminoma to seminoma around age 35. Distribution of primary sites also differed for older versus younger men (testis: 89.4% versus 92.9%; retroperitoneal: 3.8% versus 0.7%; CNS 0% versus 1.7%) except for mediastinal primary tumors, which remained constant across age groups. Fifty patients age 50 received first-line platinum-based chemotherapy; 30 experienced complications leading to treatment discontinuation, delay 7 days, or regimen change. Twenty-two (44%) patients experienced neutropenic fever, 6 despite prophylactic growth factor support. Estimated 5-year survival for chemotherapy-treated patients was 84.9%. CONCLUSIONS: Men aged 50 years comprise less than 10% of GCT diagnoses and have distinct clinical and histological characteristics as compared with younger patients. Although complications from chemotherapy occur frequently in older men, prognosis remains excellent when risk-directed treatment is administered with curative intent. Cancer 2013;119:2574-81. V C 2013 American Cancer Society.KEYWORDS: germ cell tumors; testicular cancer; age over 50; epidemiology; histology; primary site; cisplatin.
INTRODUCTIONGerm cell tumors (GCTs) primarily affect adolescent and young adult men, with diagnoses in older patients, children, and women occurring much less commonly. In men, most GCTs arise in the testis but extragonadal primary tumor sites comprise up to 10% of cases, typically in midline locations such as the mediastinum, retroperitoneum, or pineal gland. The World Health Organization classification of tumors 1 categorizes GCTs in adolescents and adults into 3 histologic groups: classic seminoma with pure histology; nonseminomatous GCT (NSGCT), comprising embryonal carcinoma, yolk sac tumor, choriocarcinoma, teratoma, and mixed histologies (which can include seminoma); and spermatocytic seminoma.2 In most epidemiological studies, rates of seminoma slightly exceed those of NSGCT, 3,4 with spermatocytic seminoma comprising < 1% of cases. The incidence of seminoma and NSGCT differs across age groups, peaking between ages 35 and 39 years for seminoma compared with 25 to 29 years for NSGCT. 4 Nevertheless, both histologic types are rare in older men with fewer than 10% a...