The aim of the following paper was to determine the influence of soft tissue therapy on respiratory efficiency and chest mobility of women suffering from breast cancer. This study was a controlled randomized trial. Tests were carried out in a group of patients (n=49), who were hospitalized in the Province Polyclinic Hospital, Konin, Poland. In the study group, irrespective of the standard physical therapy program, an additional therapy program was run. The program consisted in applying specific techniques of soft tissue treatment. All patients in the each term were subject to pulmonary function test, chest mobility and pain assessment. Statistical analysis of the obtained results of spirometry and chest mobility assessment have revealed no differences in the analyzed parameters between the examined groups in the period of joint therapeutic treatment. In the period between the 3rd examination and the end of the 11-month- rehabilitation treatment, statistically significant differences were observed in the analyzed spirometry parameters, however, there was no difference in the parameters describing airflow in small airways (MEF₅₀,PEF) between individual groups, during consecutive examinations in the course of diversified therapeutic treatment. Chest mobility assessment of the patients, performed during diversified therapeutic treatment, revealed statistically significant differences between the groups. However, there was no difference between the examined groups, as far as pain sensation is concerned. Enhancing the regular rehabilitation program by including additional therapeutic methods, which are based on myofascial release and post-isometric relaxation techniques, had a beneficial effects regarding respiratory system efficiency.