High-dose Vitamin D Supplementation for ADT-Induced Bone Loss in Older Prostate Cancer Patients (URCC-22053)


This phase III trial tests whether high-dose vitamin D works in treating androgen-deprivation therapy (ADT)-induced bone loss in patients with prostate cancer who are undergoing androgen-deprivation therapy. Vitamins are substances that the body needs to grow and develop normally. Vitamin D helps the body absorb calcium. Calcium is one of the main building blocks of bone. A lack of vitamin D can lead to bone diseases such as osteoporosis or rickets. This trial may help researcher determine if high-dose vitamin D helps keep bones strong, lowers number of falls, and lessens fatigue in men getting androgen-deprivation therapy.

  • Be diagnosed with Stage I-IV prostate cancer without metastases to bone (lymph node involvement and prior diagnosis of a primary cancer is allowed)
  • Be age 60 years or older
  • Be starting ADT or have received their first ADT treatment in the past 3 months, with at least 6 planned months of treatment remaining (both luteinizing hormone-releasing hormone (LHRH) antagonists and LHRH agonists are permitted)
  • Have a total serum vitamin D between 10 and 27 ng/ml
  • Have an total serum calcium of less than or equal to 10.5 mg/dl
  • Have a normal GFR (glomerular filtration rate)
  • Agree not to take calcium and/or vitamin D supplements for the duration of the intervention other than those provided by the study
  • Be able to provide written informed consent
  • Be able to swallow pills and capsules
  • Be able to speak and read English

  • Have long term (greater than 3 months) use of any pharmacologic bone-modifying agent including but not limited to oral or IV bisphosphonates, denosumab, or teriparatide prior to enrollment
  • Have a diagnosis of stage IV chronic kidney disease
  • Have a diagnosis of grade II or greater hypercalcemia (serum calcium greater than 10.5 mg/dl)
  • Have a history of hypercalcemia or vitamin D toxicity/sensitivity


University of Rochester NCORP Research Base

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Gibbs Cancer Center
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St. Francis Cancer Center
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