:   Drug: letrozole;   Dietary Supplement: calcium carbonate;   Other: laboratory biomarker analysis;   Dietary Supplement: calcium citrate;   Dietary Supplement: calcium glucarate;   Drug: calcium gluconate;   Dietary Supplement: cholecalciferol;   Procedure: assessment of therapy complications;   Procedure: musculoskeletal complications management/prevention
Sponsors:   Fred Hutchinson Cancer Research Center;   National Cancer Institute (NCI)
Completed - verified August 2011