Twelve volunteers—analysis of fasting effect on plasma CART levels.A total of 131 patients with neuroendocrine tumors: fifty-one midgut, thirty-eight pancreatic, five hindgut, five pulmonary, two thymic, two paraganglionic, two gastric, one ovarian, one renal, twenty-four of unknown origin. Sixty-eight patients with stable, sixty-three with progressive illness.Measurement of plasma CgA, CgB and CART immunoreactivity levels (gel chromatography and reverse-phase fast protein liquid chromatography). Here, CGA is linked to neuroendocrine neoplasm.