Menstrual and hormone patterns were investigated in 10 fertile women (median age 37, range 25-43 years) with locally advanced cervical cancer treated with neoadjuvant chemotherapy (CT). CT consisted of two cycles of high-dose cisplatin (CDDP, 40 mg/m2, Days 1 to 4) and bleomycin (B, 15 mg/m2, Days 1 and 8) separated by an interval of 21 days. Menstrual patterns before and during CT were recorded. FSH, LH, estradiol, and progesterone were assayed on the day that treatment was begun, after 2 and 4 days of CDDP administration, and weekly between and after the two cycles. Hormone assays during the first week of CT showed no significant change in hormone levels. After the first course of CT, five patients showed hypergonadotrophic amenorrhea and five patients maintained menses, two showing ovulatory and three showing follicular phase hormone patterns. After the second course of CT, one more patient become amenorrheic, and endocrine follow-up showed that two patients maintained hypergonadotrophic amenorrhea, four with hypergonadotrophic amenorrhea had a return of hormone levels to the follicular range of 7-9 weeks after, three maintained follicular phase hormone patterns until operation, and one ovulated. Gonadal dysfunction should be included among the side effects of high-dose CDDP and B regimens.