Blood Test Clue Could Help Catch Colon Cancer Earlier

Scientists just discovered that something as simple as your annual blood test might hold clues to detecting colorectal cancer in younger adults before it becomes deadly.

Researchers at Epic Research found that adults under 45 with lower levels of two common liver enzymes were more likely to develop early-onset colorectal cancer. The enzymes, called AST and ALT, are already measured in most routine checkups, which means doctors could potentially spot warning signs without any new tests.

The finding surprised researchers because doctors typically watch for high liver enzyme levels as signs of problems. "Seeing that low AST and ALT were associated with a higher likelihood of early-onset colorectal cancer stood out," said Kersten Bartelt, a clinician who worked on the analysis.

Before anyone rushes to check their lab results, experts are clear about what this doesn't mean. Low enzyme levels don't cause cancer, and nobody should panic or demand early colonoscopy based on these numbers alone. The discovery simply points researchers toward understanding why colorectal cancer cases are climbing among younger people.

That rise matters deeply. Colorectal cancer has become the leading cause of cancer deaths among Americans under 50, overtaking all other cancer types in that age group. Doctors have been searching for answers about why this is happening and how to catch cases earlier when they're most treatable.

The researchers examined other routine blood markers like cholesterol, triglycerides, and potassium levels, but only the liver enzymes showed any connection to early cancer risk. Low AST and ALT might reflect factors like muscle mass, nutrition, or overall physiology rather than liver health specifically.

Why This Inspires

This research shows how answers to pressing health questions might be hiding in plain sight. Scientists are examining data that doctors already collect millions of times each year, looking for patterns that could save lives without requiring expensive new technologies or complicated procedures.

The work also demonstrates medicine's commitment to solving the puzzle of rising cancer rates in younger adults. Researchers are exploring everything from diet and exercise to genetics and gut bacteria, refusing to accept the increase as inevitable.

Current screening guidelines recommend everyone at average risk start colorectal cancer screening at age 45. People with family history, symptoms, or other risk factors may start earlier. Almost all colorectal cancers begin as polyps that colonoscopy can find and remove before they turn dangerous.

This discovery won't change those guidelines yet, but it opens new research directions that could one day lead to better ways of identifying who needs earlier or more frequent screening.