This study examined the effects of millimeter wave (MW) therapy in 317 patients suffering from duodenal and gastric ulcers. MW therapy consisted of 30 minutes  per day exposure of the epigastric area apparatus,(10 mW/cm2, 5.6-mm wavelength) until complete ulcer cicatrisation was achieved. Results showed a 95-percent rate of ulcer cicatrisation in patients receiving the treatment compared to a 78-percent rate in controls. One year follow up showed a 54-percent ulcer recurrence rate in MW-treated patients, which was markedly less than the rate for controls.

M.V. Poslavsky, Experience with Application of Millimeter-Range Radiation for Treatment and Prophylaxis of Stomach and Duodenal Ulcer, Vopr Kurortol Fizioter Lech Fiz Kult, (4), 1989, p. 31-36.