Adenomatous (tubular adenoma) Only a small percentage actually become cancerous, but nearly all malignant polyps began as adenomatous. Fortunately, the process for these polyps to turn into colon cancer typically takes many years.
Do all adenomas turn into cancer?
Theyre considered benign, or noncancerous. But sometimes cancer can develop in an adenoma if it isnt removed. If adenomas become cancerous, theyre referred to as adenocarcinomas. Less than 10 percent of all adenomas will turn into cancer, but more than 95 percent of colon cancers develop from adenomas.
How often do adenomatous polyps become cancer?
Still, most adenomas are harmless—only about 10% of adenomas turn into cancer. Adenomas also have various growth patterns: About 80% are tubular. Tubular polyps have less than a 5% chance of becoming cancerous.