In some cases, chemotherapy can be dangerous for cancer patients. This is indicated by the results of the work of biologists from Tomsk University. In some cases chemotherapy drugs provoke mutations in tumors and the emergence of new types of cancer, more resistant to medical treatment.

The findings were made in the analysis of 70 cases of breast cancer. Women held a course of chemotherapy. In 23% of cases, this treatment did not produce the desired result, remaining cancer cells have become resistant to most drugs, increased ability of the tumor to the formation of metastases.

While scientists can't answer the question of how to solve the problem. Some are standards in the treatment of cancer patients, but to save all patients with cancer doctors.

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