Investigation of antibodies to the DNA-topoisomerase-1, the marker for autoimmune process in the blood serum, was conducted in 22 patients with chronic fibrous-degenerative pancreatitis, operated on in the clinic. The trustworthy raising of the antibodies titer in comparison with such in healthy donors was noted. In comparative analysis of the index in patients before and after the operation it was established, that in 12 of them after the standard draining operation it did not change within up to 12 months, in 10 patients, after Frey operation, performed in our modification, it had lowered almost twice.