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Today/Oncology
Oncology · The big question

A new target to break chemotherapy resistance in colon cancer

Targeting EHMT2 overcomes 5-fluorouracil resistance in colorectal cancer by modulating cell cycle and apoptosis.

PubMed2 min readAI-assisted summary
Editorial illustration for Targeting EHMT2 overcomes 5-fluorouracil resistance in colorectal cancer by modulating cell cycle and apoptosis.
Editorial illustration

Summary

For many patients with colorectal cancer, a chemotherapy drug called 5-fluorouracil, or 5-FU, is the first line of defense. Unfortunately, tumors often figure out how to survive the treatment, leading to drug resistance and poorer survival odds. Scientists have now identified a key culprit behind this resistance, a protein known as EHMT2. Researchers discovered that colorectal cancer patients who do not respond well to 5-FU chemotherapy have unusually high levels of this protein in their tumors.

To see if they could reverse this resistance, the research team tried blocking EHMT2. By silencing the protein, they altered a connected target called PPM1B. The results were striking. Without EHMT2 protecting them, the resistant cancer cells suddenly became vulnerable to the chemotherapy again. The treatment halted the cells from dividing, a process known as cell cycle arrest, and triggered apoptosis, which is the programmed death of the cancer cells.

The team then tested a specific chemical drug called BIX-01294, which is designed to inhibit EHMT2. When combined with standard 5-FU chemotherapy, this drug pairing successfully suppressed tumor growth in mice. The researchers saw the exact same success when testing the combination on organoids, which are miniature, three-dimensional tumor models grown in the lab using actual patient cells. However, the researchers caution that this work is still in early preclinical stages. Human clinical trials will be required to confirm if the treatment is safe and effective for patients.

Why it matters.

Chemotherapy resistance is one of the most daunting hurdles in cancer treatment today. When a frontline drug like 5-FU stops working, patients face a steep drop in survival rates and limited alternative treatment options. This research is incredibly valuable because it does not just propose a completely new therapy, it offers a way to salvage and rescue a widely used, existing chemotherapy.

If these findings hold up in future clinical trials, the medical community could gain a powerful new combination treatment strategy for colorectal cancer. Doctors might one day test tumors for elevated EHMT2 levels and prescribe a targeted inhibitor alongside standard chemotherapy. By stripping the cancer of its chemical shields, this approach could restore the effectiveness of frontline drugs and give patients a much better chance at long-term survival.

From the source

The story in numbers.

5-FU resistant CRC cell lines evaluated (HCT116 and HT29)
2
Cell cycle phase targeted for arrest
G1
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