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Oral OPT, administered to postmenopausal breast cancer patients receiving adjuvant AI therapy, was associated with improved EFS and DDFS; the time of OPT initiation (a time-dependent effect) did not affect the outcome. OPT did not alter the risk of visceral metastasis. Cancer 2017;123:2444-51. © 2017 American Cancer Society.

Cancer treatment-induced bone loss treatment has an important role to prevent bone loss-related events like fracture, significant morbidity, mortality, disfigurement and loss of self-esteem, and health-care expenditure. Numerous factors, including treatment regimens and bone metastasis, increase the risk of osteoporosis or local bone destruction in most breast and prostate cancer patients. Cytotoxic chemotherapies, radiation, and hormonal therapies can lead to premature menopause and decrease bone mineral density. Over 60 % of breast cancer patients within 1 year of beginning postoperative adjuvant chemotherapy experience ovarian failure. Also, ovarian ablation and aromatase inhibitors used to treat breast cancer and orchiectomy and androgen deprivation therapy (ADT; to treat prostate cancer) cause substantial bone loss. In this article, we will focus mainly on antiresorptive therapy in the management of cancer treatment-induced bone loss (CTIBL). An understanding of CTIBL is critical for determining how to assess the risk and identify which patients may benefit from preventive therapy.