Evaluation of gonadal function following long-term treatment for acute lymphoblastic leukemia in girls.

Twenty-four girls were studied following long-term treatment (mean: 50 months) for acute lymphoblastic leukemia; 14 were prepubertal and 10 pubertal. Follow-up during endocrine studies ranged from 2 months to 6.7 years (mean: 2.3 years). Five of 14 prepubertal patients started clinical pubertal development at a normal age and were reevaluated during puberty, increasing the pubertal group to 15 patients. Thirteen of 15 pubertal patients had received cranial radiotherapy. Ten of 15 pubertal patients started menses during the endocrine study. Although age of menarche was normal, in nine patients it was below the normal mean. Except for the remaining patient, all had received cranial cobalt therapy. In 6 of 19 patients bone age was significantly accelerated. Serum gonadotrophin response to LH-RH was normal in 13 prepubertal patients and in 10 pubertal patients. In 3 of 10 pubertal patients follicle-stimulating hormone (FSH) values were temporarily elevated. Only one pubertal patient had oligoamenorrhea. Five patients were studied by measuring serum progesterone on days 19-22 of the cycle to determine corpus luteum function. Three of them showed progesterone levels compatible with adequate corpus luteum function (6, 19, and 12 ng/ml, respectively) and two presented low progesterone levels (2 ng/ml), probably because of their short gynecological age (0.24 and 0.3 years, respectively). This study suggests that neither the disease nor the long-term antileukemia therapy seems to injure gonadal function in girls. A tendency to early sexual development was observed, which may be related to cranial cobalt therapy.