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The aim was to examine whether vitamin D supplementation (2000 IU/day) reduces the risk of relapse in a subgroup of patients with digestive tract cancer, showing a sufficient immune response in tumor stroma by conducting secondary subgroup analyses of the AMATERASU randomized, double-blind, placebo-controlled trial (UMIN1977). A total of 372 patients were divided into two subgroups stratified by the median density of immune cells infiltrating in tumor stroma into higher and lower halves. In the higher-half subgroup of CD56+ cells, the relapse ratio was significantly lower in the vitamin D group (7.4%) than in the placebo group (20.5%) (subdistribution hazard ratio (SHR), 0.35; 95% confidence interval (CI), 0.15-0.82), but it was equivalent (25.2% vs. 22.7%) in the lower-half subgroup of CD56+ cells (SHR, 1.21; 95% CI, 0.68-2.19) with a significant interaction ( P interaction  = 0.02). Although there were no significant differences, the risk of relapse was lower in the vitamin D group than in the placebo group in the higher half of CD45RO+ memory T cells (8.9% vs. 19.2%), and of CD8+ cytotoxic T cells (11.3% vs. 22.5%). In patients with digestive tract cancer, vitamin D supplementation was hypothesized to reduce the risk of relapse in the subgroup of patients who already have an adequate infiltration of immune cells in their tumor stroma.

cancers

Effect of Vitamin D Supplements on Relapse of Digestive Tract Cancer with Tumor Stromal Immune Response: A Secondary Analysis of the AMATERASU Randomized Clinical Trial