Is cancer contagious? Eating from the same bowl?

Cancer is usually referred to as malignant tumor, cancer is the body in the carcinogenic factors under the action of genetic changes, the body proliferation is not controlled to form a tumor. Tumor can continue to grow, break through the capsule, invasion of surrounding tissues and organs, and may be distant metastasis. Cancer is generally considered to be a genetic disease at this stage, many are in the role of external factors, due to some of their own genetic problems and show malignant transformation, so the formation of cancer. Cancer is not contagious, so cancer is not contagious, even if we eat together, it will not show infection.