[Use of respiratory mixture containing 8.0-8.5% of oxygen in hypoxic radiotherapy of cervical neoplasms].

Combined radiotherapy of patients with cervical carcinoma of stages IIb and IIIb was conducted. Hypoxia (8.0-8.5% of O2 in the respiratory mixture) was used in microfractionated (2 Gy) irradiation of metastatic spreading zones. When irradiating under conditions of hypoxia, the number of fractions was brought up to 28 as compared to 20 in control. Despite a 40%-increase of the dose, seriousness of radiation reactions and remote injuries remained at the same level. It is found that patients endure well the respiratory mixture for 6 min. necessary for irradiation.