Parathyroid Hormone Modifies the Effect of Vitamin D Supplementation on Risk of Relapse or Death in Patients with Digestive Tract Cancer: A Post Hoc Subgroup Analysis of the AMATERASU Randomized Clinical Trial. - Sasaki, Akitaka; Akutsu, Taisuke; Ohdaira, Hironori; Suzuki, Yutaka; Eto, Ken; Urashima, Mitsuyoshi (Cancers, 2026)