Can cancer patients have multiple cancers at the same time?

If cancer patients receive targeted treatment under the guidance of doctors to inhibit the proliferation of cancer cells in the body, the risk of cancer cells spreading or metastasizing to distant tissues or organs is small, and they generally do not suffer from multiple cancers at the same time. If cancer patients do not receive corresponding treatment according to doctors, the number of cancer cells in the body is large, and it is easy to spread or metastasize to distant tissues or organs such as lymph nodes, bones, kidneys, and liver.