AP BIOLOGY

Detailed explanation-1: -Malignant tumors can grow quickly and spread to other parts of the body in a process called metastasis. However, not all malignant tumors grow quickly; some can grow much slower over time. The cancer cells that move to other parts of the body are the same as the original ones, but they can invade other organs.

Detailed explanation-2: -Scientists have found that for most breast and bowel cancers, the tumours begin to grow around ten years before they’re detected. And for prostate cancer, tumours can be many decades old. “They’ve estimated that one tumour was 40 years old. Sometimes the growth can be really slow, ” says Graham.

Detailed explanation-3: -A cancerous tumor is malignant, meaning it can grow and spread to other parts of the body. A benign tumor means the tumor can grow but will not spread. Some types of cancer do not form a tumor. These include leukemias, most types of lymphoma, and myeloma.

Detailed explanation-4: -Cancer cells don’t follow the regular routine. Needed or not, they grow and divide and don’t die off when they should. It’s this out-of-control growth that leads to cancer.