Our expert says:
Primary cancer just mean that this is the source of the cancer and secondary means this is a metastasis (spreading) of the cancer. As an example: you can develop colon cancer and get metastasis to the lung. If they biopsy the tumour in the lung, the type of tissue they will find is colon tissue. Sometimes the primary cancer will cause death ( for instance if it is a tumor in the brain and it starts bleeding) and sometimes the secondary cancer can cause death (for instance if it causes liver failure)
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