CD4 and diabetes mellitus: Diabetes mellitus (p = 0.0076), serum albumin level (p = 0.030), Eastern Cooperative Oncology Group Performance Status (ECOG PS) (p = 0.0007), serum CA19–9 level (p = 0.0028), and peripheral CD4+ T cell ratio (p = 0.011) were significantly associated with prognosis in multivariate analyses.