Feminization in hepatocellular carcinoma corrected by chemotherapy: a case report.

A 17-year-old boy with metastatic hepatocellular carcinoma and feminization became asymptomatic after administration of antineoplastic agents. Serum estradiol level, urine estrogens, and tumor estrogen receptors were changed after the treatment. Achievement of partial remission resulted in normalization of the serum sex hormone profile and disappearance of the feminization in spite of the presence of residual tumor. Thus, serum hormone levels alone cannot be used as tumor markers for control of therapy. This suggests that chemotherapy may have altered the biological behavior of the tumor, which resulted in loss of its ability to synthesize estrogen estrogen receptors.