Colon Cancer Cells May "Switch Identity" to Spread

Scientists have found a surprising new way that colon cancer spreads through the body. Researchers say cancer cells can change their identity, almost like a disguise, which helps them travel and form new tumors in other organs. The study was published in a science journal called Cell Stem Cell. This discovery could change how doctors think about and treat colon cancer.

For a long time, scientists believed that cancer spread mainly because of changes in DNA, called mutations. But this new research suggests something different is going on. Instead of DNA changes, the cancer cells go through what scientists call epigenetic changes. These changes turn genes on or off without actually changing the genetic code itself.

At the center of this discovery is a molecule called GATA6. Think of GATA6 as a kind of identity keeper for the cells that line the intestine. It helps those cells do their normal jobs in the body. But when GATA6 levels drop, cancer cells can lose their identity and turn into something very different.

When that happens, the cells shift into a more basic, primitive state — similar to cells found in a developing baby. Scientists call this ability cellular plasticity, meaning cells can change what type they are based on their environment. This shift makes the cancer cells much better at surviving, moving through the body, and starting new tumors.

Researchers from Weill Cornell Medicine and the Massachusetts Institute of Technology studied this process using special lab models called organoids. Organoids are tiny, three-dimensional clusters of cancer cells grown to act like real tumors. By transplanting these cells into mice over and over, the team was able to watch how cancer cells became more aggressive and able to spread.

Dr. Tracy Proverbs-Singh, a cancer doctor who treats digestive system cancers, said the study uncovered a critical reason why colon cancer is able to spread to other organs. She explained that when GATA6 is lost, cancer cells go through an identity swap. They revert to a more primitive, fetal-like state that makes them harder to stop.

The study also found that low levels of GATA6 were commonly seen in tumors that had already spread. Patients with those tumors tended to have worse health outcomes. This helps explain why metastatic colon cancer — cancer that has spread to other organs like the liver — is so hard to treat.

The findings open up exciting new ideas for treatment. Since the identity swap is driven by epigenetic changes, scientists may be able to find ways to block it. Proverbs-Singh said that GATA6 levels could one day be used to predict which tumors are most likely to spread, helping doctors find high-risk patients earlier.

She also said the discovery points toward future treatments that could stop cancer from spreading before it even starts, by preventing the identity swap and keeping cancer cells in a less dangerous state. While the research is still in its early stages, she called it a major step forward. Scientists are hopeful that this new understanding will lead to better ways to fight one of cancer's most dangerous behaviors.