Why can't malignant tumor do needle biopsy casually

For some malignant tumors, such as malignant melanoma, puncture biopsy, especially in the early stage, may stimulate distant metastasis of cancer cells, so that the tumor can not be cured. In this case, puncture biopsy is often not chosen, but directly expanded resection. But for most of the malignant tumor, have been found in the middle-late, has lost the chance of cure, such as lung cancer, pancreatic cancer, liver cancer, etc., in order to specify the specific pathological type of tumor biopsy is required, and only clear pathological types can formulate radiotherapy, chemotherapy and metastasize there and biopsy needle and risk of distant metastases are relatively small, Compared with the benefits of treating tumors, needle biopsies carry little risk and are safe for humans.

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