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There exists no alternative treatment comparable to surgical excission, so those cancer patients probably had inoperable and/or metastatic tumours, assigned to intravenous pharmacological interventions.
It is well established that most old  or novel  chemotherapeutic agents prolong patients' survival for only 3 months.
So, cancer patients undergoing conventional cancer treatment with various combinations of chemotherapy drugs, can expect to live maximum 3 months more than those cancer patients who initially choose alternative medicine therapies.
In fact, this minor survival benefit will only be achieved if we admit that all alternative therapies are completely worthless.