Statement: Intervention 2 of the primary trial resulted in a lower percentage change in tumor diameter than intervention 1.
Primary_evidence: Outcome Measurement:    Percent Change (Between Baseline and Month 12) in Mammographic Density by the Boyd Method Compared Between Arms   To evaluate change in mammographic density using the Boyd method after one year of vitamin D supplementation compared to placebo in premenopausal women. The percent change in breast density will be reported here.   Time frame: 12 months Results 1:    Arm/Group Title: Placebo   Arm/Group Description: Patients receive oral placebo once daily for 12 months.   Overall Number of Participants Analyzed: 46   Mean (Standard Deviation)   Unit of Measure: percent change  -3.4         (7.1) Results 2:    Arm/Group Title: Vitamin D   Arm/Group Description: Patients receive oral vitamin D (2000 IU) once daily for 12 months.   Overall Number of Participants Analyzed: 40   Mean (Standard Deviation)   Unit of Measure: percent change  -1.4         (11.9)