Within a first flexible rectoscopy (Day 1) the product will be applied transanally. Then the patients will apply it as enemas twice daily for 7 days. On day 8 (after treatment completion), and on day 31 (after 23 days of no treatment) follow-up flexible rectoscopies will be performed.

Assessment of the effects of the mixture on the number of petechiae in the rectum. Within the first flexible rectoscopy (Day 1) the most affected areas of the rectal mucosa (on the anterior and posterior wall) will be determined. A 27 mm CAPTIVATOR hexagonal polypectomy snare (Boston Scientific) will be introduced through the endoscope, and will be fully opened. The fully open polypectomy snare (9,2 cm2) will be applied over the most affected areas on the anterior and posterior rectal wall, and the number of the petechiae within these areas will be documented. The flexible rectoscopy will be repeated on day 8 after patients have already received enemas with the examined substance twice daily for one week, and the number of the petechiae will be documented as above mentioned. After a period of 23 days with no treatment, a follow-up flexible rectoscopy will be performed on day 31, and the petechiae of the rectal mucosa will be once more assessed.

The effects of the mixture on subjects' quality of life will be assessed using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire - Proctitis Module with 20 Questions Score (EORTC QLQ-PRT20). The questionnaire consists of 18 quantitative, 2 qualitative (one of them being optional), and 1 semi-quantitative questions . Using the quantitative questions, a score can be defined. Its minimum value is 18 (meaning patients have no symptoms), and its maximum value is 72 (meaning greatest extent of lifestyle limitations because of radiation proctitis). The semi-quantitative question provides information about the highest number of defecations per 24 hours and is not included in the score. The qualitative questions determine the use of medicines, and patients' will to receive any assistance concerning their symptoms.

The score will be documented on day 1, 8, 31 and 6 months after treatment completion.