diagnosis (28, 30-32), while results from prospective studies with longer follow-up periods after vitamin D measurement have generally been less strong (20, 22, 26, 27, 29). It is unclear whether this difference reflects less misclassification of vitamin D status in studies with a short interval between measurement and cancer diagnosis or suggests a short-term etiologic effect of vitamin D on tumor development. Addi-
tional prospective studies exploring the timing of vitamin D assessment are clearly warranted.
diagnosis (28, 30-32), while results from prospective studies with longer follow-up periods after vitamin D measurement have generally been less strong (20, 22, 26, 27, 29). It is unclear whether this difference reflects less misclassification of vitamin D status in studies with a short interval between measurement and cancer diagnosis or suggests a short-term etiologic effect of vitamin D on tumor development. Addi-tional prospective studies exploring the timing of vitamin D assessment are clearly warranted.
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