Changes in serum hormonal levels from the onset of radiotherapy. The serum estradiol level, which was very high before radiotherapy, rapidly decreased after the onset of radiotherapy (dashed line; pg/mL). The serum luteinizing hormone level (solid line; mIU/mL) and serum follicle stimulating hormone level (long dashed, short dashed line; mIU/mL) gradually increased after radiotherapy. These changes in hormonal levels suggested that our patient was of post-menopausal status. FSH; follicle stimulating hormone, LH; luteinizing hormone, RT; radiotherapy.