CANCER
CANCER CANCER 506 507 509 510 INTRODUCTION Cancers are a large family of diseases that involve abnormal cell growth with the potential to invade or spread to other parts of the body. They form a subset of neoplasms. A neoplasm or tumor is a group of cells that have undergone unregulated growth and will often form a mass or lump, but may be distributed diffusely. All tumor cells show the six hallmarks of cancer. These characteristics are required to produce a malignant tumor. They include: •Cell growth and division absent the proper signals. •Continuous growth and division even given contrary signals. •Avoidance of programmed cell death. •Limitless number of cell divisions. •Promoting blood vessel construction. •I...