Table 2.

Studies evaluating the association between vitamin D metabolites and cancer in humans.

Reference	Cancer	Calcidiol	Calcitriol
Ma et al. (1998)	Prostate	S	S
Jacobs et al. (2011)	Prostate	NS	NS
Barnett et al. (2010)	Prostate	S	–
Ahn et al. (2009)	Prostate	S	NS
Travis et al. (2009)	Prostate	NS	–
Robsahm et al. (2004)	Breast	S	–
Janowsky et al. (1999)	Breast	NS	S
Garland et al. (2007)	Breast	S	–
Abbas et al. (2008)	Breast	S	–
Mohr et al. (2008)	Breast	S	–
Newton-Bishop et al. (2009)	Melanoma	S	–
Nürnberg et al. (2009)	Melanoma	S	–
Robsahm et al. (2004)	Colon	S	–
Yin et al. (2009)	Colon	S	–
Jenab et al. (2010)	Colon	S	–
Wactawski-Wende et al. (2006)	Colon	NS	–
Gorham et al. (2007)	Colon	S	–

S, statistically significant; NS, not significant; –, not studied.