Am J Clin Nutr. 2011 Jan;93(1):108-17. Epub 2010 Oct 27.

Vitamin D and breast cancer recurrence in the Women's Healthy Eating and Living (WHEL) Study.
Jacobs ET, Thomson CA, Flatt SW, Al-Delaimy WK, Hibler EA, Jones LA, Leroy EC, Newman VA, Parker BA, Rock CL, Pierce JP.
Arizona Cancer Center, University of Arizona, Tucson AZ, USA. jacobse at u.arizona.edu

BACKGROUND: There is a paucity of research evaluating the relation between vitamin D and recurrence of breast cancer after treatment.

OBJECTIVE: This study was designed to evaluate the associations between circulating concentrations of 25-hydroxyvitamin D 25(OH)D and dietary, supplemental, and total intake of vitamin D and recurrent or new breast cancer events within the Women's Healthy Eating and Living (WHEL) Study.

DESIGN: A prospective cohort study design (n = 3085) was used to evaluate the relation between dietary, supplemental, and total vitamin D intake and recurrent breast cancer, and a nested case-control study with 512 matched pairs was used for analysis of the association between 25(OH)D and breast cancer recurrence.

RESULTS: No relation between 25(OH)D and breast cancer recurrence was observed. Compared with women with serum concentrations of 25(OH)D ? 30 ng/mL, adjusted odds ratios (95% CI) for breast cancer recurrence were 1.14 (0.57, 2.31) for those with concentrations < 10 ng/mL, 1.00 (0.68-1.48) for concentrations ? 10 and < 20 ng/mL, and 1.05 (0.76, 1.47) for concentrations ? 20 and < 30 ng/mL. No significant associations were observed when analyses were stratified by pre- and postmenopausal status or for local, regional, or distant recurrence or death. Vitamin D intake was not related to breast cancer recurrence overall, although for premenopausal women there was a significant inverse association between dietary vitamin D intake and recurrence (P for trend = 0.02).

CONCLUSION: These results do not provide support for a relation between concentrations of 25(OH)D after treatment and the recurrence of breast cancer. This trial is registered at clinicaltrials.gov for the WHEL Study as NCT00003787. PMID: 20980485
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See also in VitaminDWiki - very little consensus

• All items in category Breast Cancer and Vitamin D 259 items
• Overview Breast Cancer and Vitamin D

Apparently lots of problems with the study - details in early Feb 2010