INS and neoplasm: In particular, improving patients were characterized by the following: (1) presence of a (preferentially malignant) pancreatic tumor, (2) diagnosis of impaired glucose homeostasis in the oGTT, but rarely elevated fasting glucose, concomitantly with tumor diagnosis, (3) postoperative normalization of insulin resistance and (4) postoperative decreased insulin secretion in the fasting and glucose-stimulated state.