P-162 Universally adopted vitamin D deficiency cutoff of 10 ng/mL is optimal for metastatic colorectal cancer prognostication and correlated with neutrophil/lymphocyte ratio

Serum Vitamin D (Vit.D) deficiency is an established poor prognostic factor in metastatic colorectal cancer (mCRC) patients (pts). Although a serum level < 10 ng/mL is universally adopted to define deficiency, the optimal cutoff value and main contributors of low Vit.D in this disease setting have been underreported. Consecutive mCRC pts treated with standard chemotherapy were tested for serum Vit. D levels, as well as for routine biochemical...