Cancer

4. Collection of over 200 diseases characterized by uncontrollable cell division and lack of programmed cell death
6. Improving the quality of life by relieving symptoms and reducing suffering
8. Noncancerous tumor
10. Spreading of cancer cells from a primary site of origin to distant sites
13. Cancer type in which viruses account for between 80% and 90% of cases
15. According to the Roman numeral staging system, the most advanced cancer stage, with metastasis to other organs or throughout the body
17. Development of any new and independent cells in the body that do not follow the same laws governing other cells and serve no useful purpose
18. Early cancer that is present only in the cell layers where it began; preinvasive stage
20. Cancer that causes most cancer-related deaths in both men and women in the United States

1. Cancerous tumor
2. A type of metastasis that involves direct invasion of tumors into surrounding tissues
3. General term used to describe the extent and spread of cancer
5. Cancer-causing agents such as chemicals, radiation, and viruses
7. The use of chemical agents to destroy cancer cells
9. Use of ionizing radiation to destroy cancer cells
11. Treatment method used to remove tumors, cancerous organs, and affected lymph nodes
12. A type of metastasis that involves the spreading of cancer cells along surfaces of membranes that cover body cavities
14. Study of tumors
16. Mass formed by neoplastic cells
19. Staging system that assesses cancer in three different categories: size of the primary tumor, extent of lymph node involvement, and presence and extent of metastasis