Which disease process involves uncontrolled cell growth that can damage tissues?

• A. Cancer
• B. Infection
• C. Autoimmune
• D. Allergy

Answer: (A)

Uncontrolled cell growth that damages tissues is a defining feature of cancer. In healthy tissue, cell division is tightly regulated by genes and signals that tell cells when to grow and when to stop or die. When mutations disrupt these controls, cells can begin to proliferate without normal limits, forming tumors. As cancer progresses, cells may invade nearby tissues and spread to distant sites (metastasis), causing further tissue damage and organ dysfunction. Infections involve pathogens causing disease, autoimmune conditions arise when the immune system targets the body's own tissues, and allergies are exaggerated immune responses to harmless substances; none inherently describe unregulated cell growth like cancer.