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For 1st time, drugs target cancer regardless of origin

NEW YORK — For the first time, three pharmaceutical companies are poised to test whether new drugs can work against a wide range of cancers independently of where they originated — breast, prostate, liver, lung.

The drugs go after an aberration involving a cancer gene fundamental to tumor growth. Many scientists see this as the beginning of a new genetic age in cancer research.

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Great uncertainties remain, but such drugs could mean new treatments for rare, neglected cancers, as well as common ones. Merck, Roche, and Sanofi are racing to develop their own versions of a drug they hope will restore a mechanism that normally makes badly damaged cells self-destruct and could potentially be used against half of all cancers.

No pharmaceutical company has ever conducted a major clinical trial of a drug in patients who have different kinds of cancer, researchers and federal regulators say.

‘‘This is a taste of the future in cancer drug development,’’ said Dr. Otis Webb Brawley, the chief medical and scientific officer of the American Cancer Society. ‘‘I expect the organ from which the cancer came from will be less important in the future and the molecular target more important,’’ he added.

And this has major implications for cancer philanthropy, experts say. Advocacy groups should shift from fund-raising for particular cancers to pushing for research aimed at many kinds of cancer at once, Brawley said. John Walter, chief executive of the Leukemia and Lymphoma Society, concurred, saying that by pooling forces ‘‘our strength can be leveraged.’’

At the heart of this search for new cancer drugs are patients such as Joe Bellino, who was a post office clerk until his cancer made him too ill to work. Seven years ago, he went into the hospital for hernia surgery, only to learn he had liposarcoma, a rare cancer of fat cells. A large tumor was wrapped around a cord that connects the testicles to the abdomen. ‘‘I was shocked,’’ he said in an interview this summer.

Companies have long ignored liposarcoma, seeing no market for drugs to treat a cancer that strikes so few. But it is ideal for testing Sanofi’s drug because the tumors nearly always have the exact genetic problem the drug was meant to attack — a fusion of two large proteins.

If the drug works, it should bring these raging cancers to a halt. Then Sanofi would test the drug on a broad range of cancers with a similar genetic alteration. But if the drug fails against liposarcoma, Sanofi will reluctantly admit defeat.

“For us, this is a go/no-go situation,’’ said Laurent Debussche, a Sanofi scientist

The genetic alteration the drug targets has tantalized researchers for decades. Normal healthy cells have a mechanism that tells them to die if their DNA is too badly damaged to repair. Cancer cells have grotesquely damaged DNA, so ordinarily they would self-destruct.

A protein known as p53 that Dr. Gary Gilliland of Merck calls the cell’s angel of death normally sets things in motion. But cancer cells disable p53, either directly, with a mutation, or indirectly, by attaching the p53 protein to another cellular protein that blocks it.

The dream of cancer researchers has long been to reanimate p53 in cancer cells so they will die on their own.

The p53 story began in earnest about 20 years ago. Excitement ran so high that, in 1993, Science magazine anointed it Molecule of the Year and put it on the cover. An editorial held out the possibility of ‘‘a cure of a terrible killer in the not too distant future.’’

Companies began chasing a drug to restore p53 in cells where it was disabled by mutations. But while scientists know how to block genes, they have not figured out how to add or restore them. Researchers tried gene therapy, adding good copies of the p53 gene to cancer cells. That did not work.

Then, instead of going after mutated p53 genes, they went after half of cancers that used the alternative route to disable p53, blocking it by attaching it to a protein known as MDM2. When the two proteins stick together, the p53 protein no longer functions.

Maybe, researchers thought, they could find a molecule to wedge itself between the two proteins and pry them apart.

They did.

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