reported a patient with primary mucinous cystadenocarcinoma of the testis whose laboratory findings showed elevated serum CA19-9 (17,200 U/mL, normal <37 U/mL) and CEA (6.5 ng/mL, normal<5 ng/mL), but normal levels of the germ cell tumor markers LDH, β-hCG, and AFP (25). The gene discussed is CEACAM5; the disease is testicular germ cell tumor.