ALB and vitamin D deficiency: Previous studies identified that risk factors for hypocalcemia include the type of cancer (hematologic malignancy and prostate, lung, and gastric cancers), poor performance status (PS), hospitalization, impaired kidney function, albumin-adjusted calcium level at baseline, elevated baseline bone turnover markers (urinary N-telopeptide of type I collagen and bone-specific alkaline phosphatase), higher baseline serum alkaline phosphatase levels, concomitant drug usage (vonoprazan and dexamethasone), and vitamin D deficiency at baseline [25–28].