Toremifene use does not alter serum inhibin A and B levels during mid-luteal phase in women with premenstrual mastalgia

Aims.?To find out if there is any link between the therapeutic effect of toremifene on premenstrual mastalgia and luteal phase serum inhibin A and/or B levels.

Methods.?Forty-eight patients participating in a randomized cross-over trial on toremifene vs. placebo for premenstrual mastalgia gave three blood samples during the luteal phase of the menstrual cycle: the first at baseline, the second during the third toremifene/placebo cycle, and the third during the third placebo/toremifene cycle, respectively. The blood samples were analyzed for inhibin A and B with respective specific two-site enzyme-linked immunosorbent assays. Toremifene (20?mg/d) and placebo were administered during the luteal phase only.

Results.?When all the toremifene-treated cycles were compared with all the placebo cycles and with the baseline, the median inhibin A levels were 42, 38, and 40?pg/ml, respectively (baseline versus toremifene, p?=?0.638; baseline versus placebo, p?=?0.468; and toremifene versus placebo, p?=?0.365). The median inhibin B levels were at baseline 19?ng/l, during placebo 20?ng/l, and during toremifene 17?ng/l (baseline versus toremifene, p?=?0.983; baseline versus placebo, p?=?0.519; and toremifene versus placebo, p?=?0.880).

Conclusion.?A luteal administration of toremifene does not seem to result in any changes in mid-luteal concentrations of inhibin A or B in serum.