- Gonadal dysfunction-The chemotherapy drug cyclophosphamide may affect sex hormone production, leading to infertility, early menopause or brittle bones. Low sex hormone levels may also increase the risk for heart attack, obesity or fracture. Patients will have blood tests to measure hormone levels as well as mineral levels, lipid levels and blood cell counts. They will also have a DEXA scan to measure bone mineral density and a CT scan of the abdomen to evaluate the distribution of fatty tissue in the abdomen. Males will be offered a semen analysis as part of the fertility evaluation.