[Tamoxifen induced fluorescence as a marker of hormone receptors: cytological study of fine needle biopsy of malignant breast tumors in treated women].

Tamoxifen-induced fluorescence was used as a marker of hormone receptors in breast tumor cytology. Patients receiving Tamoxifen were compared to patients without such a therapy. Only those receiving this treatment showed fluorescence in their malignant cells. Moreover, in this group, such a fluorescence was noticed only in those patients with hormonal receptors in their tumor cells and not in the patients without estrogen and progesterone receptors. Such a technique seems to be a good method for predicting response to hormonal therapy.