Immunological Study of IFN-γ, ICAM-4, and Vitamin D3 Markers among Gastrointestinal Tumor Patients in Babylon Province, Iraq.OBJECTIVE: The current study was directed to investigate the roles of ICAM-4, IFN-γ, and vitamin D3 markings among benign and malignant gastrointestinal stromal tumors (GISTs) Eighty-eight players, accommodated to the Babylon GIT Center,