One year, an elderly female patient in her eighties, Sun, with no smoking history, recently developed dry cough, chest pain, wasting and other symptoms, and was diagnosed with left lung cancer with mediastinal lymph node metastasis by CT examination, her children were very filial and worried that further pathological puncture would cause psychological pressure on her mother. So the patient’s children bought ERSA for their mother at a cost of 10,000 yuan. After taking the drug for one month, the cough was significantly worse than before, and the patient could not rest because of the incessant coughing day and night. After more than 20 days of radiation therapy, the patient’s cough was significantly reduced, and the re-examination of CT indicated that the lung cancer lesions and mediastinal lymph node metastases were reduced by two-thirds compared with before. The patient’s children only said that it was really amazing, but they still had to follow the professional doctor’s advice for standardized and individualized treatment.