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New potential breast cancer drug identified

The new molecule, dubbed ERX-11, mimics a peptide, or protein building block

Press Trust of India  |  Houston 

AI, Lifespan, Doctors, Research

Scientists, including an Indian-American researcher, have identified a molecule that can help treat breast cancer, giving hope to patients who have become resistant to traditional therapies.

The first-in-class molecule shuts down oestrogen- sensitive breast in a new way, researchers said.

First-in-class are those that work by a unique mechanism — in this case a molecule that targets a protein on the receptor of tumour cells. The potential drug offers hope for patients whose breast has become resistant to traditional therapies.

“This is a fundamentally different, new class of agents for oestrogen-receptor-positive breast cancer,” said Ganesh Raj, professor at the University of Texas Southwestern (UT Southwestern) Simmons Center.

“Its unique mechanism of action overcomes the limitations of current therapies,” Raj said. All breast cancers are tested to determine if they require to grow and about 80 per cent are found to be oestrogen-sensitive, researchers said. These cancers can often be effectively treated with hormone therapy, such as tamoxifen, but as many as a third of these cancers eventually become resistant, they said. The new compound is a potential highly effective, next- line treatment for these patients, said Raj.

A major breakthrough

  • Scientists have identified a molecule that can help treat breast cancer
  • The molecule shuts down oestrogen- sensitive breast in a new way, researchers say
  • The potential drug offers hope for patients whose has become resistant to traditional therapies
  • The new drug can be highly effective when hormone therapy does not work

Traditional hormonal drugs, such as tamoxifen, work by attaching to a molecule called the receptor in cells, preventing from binding to the receptor, a necessary step for cells to multiply.

However, the receptor can mutate and change its shape over time so that the treatment drug no longer fits neatly with the receptor. When this happens, the cells start multiplying again. “There has been intense interest in developing that block the ability of the receptor — the prime target in most breast cancers - from interacting with the co-regulator proteins that cause a tumour’s growth,” said David Mangelsdorf, professor at UT Southwestern.

Blocking such “protein-protein interactions” has been a dream of researchers for decades. The drug works by blocking other molecules - proteins called co-factors — that also must attach to the receptor for cells to multiply.

The new molecule, dubbed ERX-11, mimics a peptide, or block.

So far, it has been tested in mice and in cells removed from patients and works well in both models, and there have been no signs of toxicity in the tests.

If successfully translated to a human therapy, another advantage of ERX-11 is that it could be taken orally by patients, rather than as an infusion.

The researchers are hoping to get a clinical trial under way in about a year. The notion of blocking protein co-factors has implications for treatment of other cancers as well.

First Published: Sat, August 19 2017. 21:18 IST
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