Despite of an obvious success in the management of cancer patients and in the quality of medical care for them, however there are still open questions on the effectiveness of prevention and treatment of complications after surgery, chemotherapy, and radiotherapy, as well as on the quality of comprehensive rehabilitation of such patients. One of the possible ways to solve these issues is low-level laser therapy.Laser therapy in Russia has been successfully used in many areas of modern clinical medicine for more than 50 years; it is still developing and improving. Main advantages of laser therapy are simplicity, comfort, and safety for patients, as well as low costs.The widespread use of low-level laser light has experimental and clinical justification. Awareness in principles of dosing, methodological features of laser procedures, justified prescription and strict compliance with indications and contraindications can ensure high effectiveness of the discussed therapy in oncologic patients.