INS and type 1 diabetes mellitus: In the present study, we established a large cohort of patients undergoing TP for diffuse pancreatic tumors to summarize the characteristics of diabetes secondary to TP during perioperative and long-term follow-up, including the continuous glucose monitoring (CGM) parameters and insulin pump therapy which were rarely reported before, and compared these with complete insulin-deficient type 1 diabetes mellitus (T1DM).