Cancer for the main information processing center associated with human body. Tumors inside brain are malignant or harmless, and certainly will happen at all ages. Just cancerous tumors tend to be malignant. Major brain tumors cancer at first forms in the brain muscle. Additional mind tumors types of cancer tend to be types of cancer that have spread toward brain muscle (metastasized) from in other places in the body. Secondary mind cancer is termed the organ or tissue where cancer tumors begins, particularly lung cancer tumors with secondary brain metastasis.