BRD2 and germ cell tumor: FSH, follicle-stimulating hormone; MESA, microscopic epididymal sperm aspiration; TESE, testicular sperm extraction; RPLND, retroperitoneal lymph node dissection; BEP, bleomycin/etoposide/cisplatin; ReVSA, retrograde vasal sperm aspiration; NSGCT, non-seminomatous germ cell tumor