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Home›Medical research›Pioneers in the medical field awarded with Nobel Prize

Pioneers in the medical field awarded with Nobel Prize

By Ramoju kishore kumar
October 2, 2018
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Two cancer researchers have been awarded the 2018 Nobel Prize in Physiology or Medicine for their discovery of how the immune system can be harnessed to attack tumor cells, which led to immune checkpoint inhibitor therapy.

Award has been shared for James P. Allison, PhD, of the University of Texas MD Anderson Cancer Center in Houston, and Tasuku Honjo, MD, PhD, of Kyoto University in Japan.

The Nobel Assembly at Karolinska Institute has awarded the 2018 Nobel Prize in Physiology or Medicine jointly to James P. Allison and Tasuku Honjo.

The Birth of Cancer Immunotherapy

During the 1990s, in his laboratory at the University of California, Berkeley, Allison was one of several scientists who discovered that the protein CTLA-4 functions as a brake on T cells. Other research teams exploited the mechanism as a target to treat autoimmune disease. But Allison had other ideas.

Having developed an antibody that binds to CTLA-4 and blocks its function, he began investigating whether CTLA-4 blockade could disengage the T-cell brake and unleash the immune system to attack cancer cells. Allison’s team performed the first experiments at the end of 1994, and the results were “spectacular,” the Nobel organization said. Mice with cancer were cured with an anti-CTLA-4 agent.

In 1992, Honjo discovered programmed cell death 1 (PD-1), another protein expressed on the surface of T cells. In a series of experiments, Honjo showed that PD-1 (like CTLA-4) also functions as a T-cell brake, but operates by a different mechanism.

In 2012, a pivotal study demonstrated clear efficacy in the treatment of patients with different types of cancer. “Results were dramatic, leading to long-term remission and possible cure in several patients with metastatic cancer, a condition that had previously been considered essentially untreatable,” the Nobel organization said.

The pioneering work of Allison and Honjo on immune checkpoint inhibitor therapy led to the development of several drugs, including ipilimumab (Yervoy, Bristol-Myers Squibb), the first of the checkpoint inhibitors, and the PD-1 inhibitors nivolumab (Opdivo, Bristol-Myers Squibb) and pembrolizumab (Keytruda, Merck & Co).

A large number of checkpoint therapy trials are currently underway against most types of cancer, and new checkpoint proteins are being tested as targets.

TagscancerimmunotherapyProgrammed cell death
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