the following serum tumor markers are elevated above normal levels in 50 percent or more of patients with various malignant neoplasms : alpha-fetoprotein in yolk sac tumors , hepatomas , retinoblastomas , embryonal carcinomas , breast carcinomas , and carcinomas of uterine cervix ;
C0006826
malignant neoplasms
C0035335
retinoblastomas