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2018 Nobel Prize in Medicine Awarded to 2 Cancer Immunotherapy Researchers Oct

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2018 Nobel Prize in Medicine Awarded to 2 Cancer Immunotherapy Researchers Oct 2018 Nobel Prize in Medicine Awarded to 2 Cancer Immunotherapy Researchers Oct. 1, 2018 The Nobel Prize for Physiology and Medicine was awarded to James P. Allison, left, and Tasuku Honjo on Monday for their work on cancer research.Jonathan Nackstrand/Agence France-Presse — Getty Images The Nobel Prize in Physiology or Medicine was awarded on Monday to James P. Allison of the United States and Tasuku Honjo of Japan for their work on unleashing the body’s immune system to attack cancer, a breakthrough that has led to an entirely new class of drugs and brought lasting remissions to many patients who had run out of options. Their success, which came after many researchers had given up on the idea, “brought immunotherapy out from decades of skepticism,” said Dr. Jedd Wolchok, a cancer specialist at Memorial Sloan Kettering Cancer Center in New York. It has, he said, “led to human applications that have affected an untold number of people’s health.” Before Dr. Allison’s and Dr. Honjo’s discoveries, cancer treatment consisted of surgery, radiation, chemotherapy and hormonal treatments. A statement from the Nobel committee hailed their accomplishments as establishing “an entirely new principle for cancer therapy.” The drugs based on their work belong to a class called checkpoint inhibitors, with tongue-twisting names that have nonetheless become familiar to many patients. The first ones approved were ipilimumab (brand name Yervoy), nivolumab (Opdivo) and pembrolizumab (Keytruda). Others have since come to market. Earlier attempts by other researchers to recruit the immune system to fight cancer sometimes worked but more often did not. Dr. Allison and Dr. Honjo succeeded where others had failed by deciphering exactly how cells were interacting so they could fine-tune methods to control the immune system. Checkpoint inhibitors do not work for everyone and they have only been approved for some cancers. They can have severe side effects, and they are expensive, costing more than $100,000 a year. But the approach, known as immunotherapy, has become a mainstay of treatment for a number of types of cancer, and a great deal of research is underway — including work by Dr. Allison and Dr. Honjo — to find the best ways of combining checkpoint inhibitors with one another and with standard treatments to help more patients. The checkpoint inhibitors now on the market are used for cancers of the lung, kidney, bladder, head and neck; for the aggressive skin cancer melanoma; and for Hodgkin lymphoma and other cancers. checkpoint ANTIGEN PRESENTING CELL Antigen receptor T-CELLS T-cells are a type of white blood cell that can identify and kill infected, damaged or cancerous cells. Each T-cell has clawlike receptors on its surface that can recognize and lock onto antigens, foreign or abnormal protein fragments on the surface of infected or cancerous cells. ACTIVATING A T-CELL The T-cell must be activated before it can find and attack cancer cells. A specialized cell presents the T-cell with an antigen from a cancer cell, along with a co-stimulator protein. The T-cell begins to hunt down and kill any cells that are covered with the same antigen. CANCER AND CHECKPOINTS Cancer cells can avoid destruction by taking advantage of a switch on the T- cell called an immune checkpoint. The checkpoint can shut down the T- cell and suppress the immune response, allowing the cancer to grow undisturbed. CHECKPOINT INHIBITORS Drugs known as checkpoint inhibitors can physically block the checkpoint, which frees the immune system to attack the cancer. A single T- cell can kill thousands of cancer cells. Dr. Honjo, 76, is a longtime professor at Kyoto University, where he did his landmark work. Previously, he did research at Osaka University, the University of Tokyo and the National Institutes of Health in Washington. Dr. Allison, 70, is chairman of immunology at the University of Texas M.D. Anderson Cancer Center. He did the work recognized by the Nobel committee while working the University of California at Berkeley and Memorial Sloan Kettering Cancer Center in New York. “When I’m thanked by patients who recover, I truly feel the significance of our research,” Dr. Honjo said during a news conference at the Japanese university, according to Japanese news reports. He added: “I’d like to continue researching cancer for a while so that this immunotherapy will help save more cancer patients than ever before.” In a telephone interview, Dr. Allison said that when checkpoint inhibitors work, patients “are good to go for a decade or more.” He said he was working with other researchers, including his wife, Dr. Padmanee Sharma, an oncologist at MD Anderson, to understand the mechanisms so the treatments would help more patients. “It’s a big challenge,” Dr. Allison said. “But we know the basic rules now. It’s just a matter of more hard work to put things together based on science.” Dr. Allison said he first heard about the prize via calls and texts from family, friends and colleagues who had seen news reports, before the Nobel committee could reach him. He was in New York, and the committee did not have his cellphone number. Dr. Allison and Dr. Honjo, working separately, showed in the 1990s how certain proteins act as “brakes” on the immune system’s T-cells and limit their ability to attack cancer cells. Suppressing those proteins, they theorized, could transform the body’s ability to fight cancer. T-cells, a type of white blood cell, are sometimes called the soldiers of the immune system. They are deployed to fight infections and cancer, but malignant cells can elude them. The T-cells carry molecules called checkpoints, that the body uses to shut the cells down when it needs to stop them. Cancer cells can lock onto those checkpoints, crippling the T-cells and preventing them from fighting the disease. Dr. Allison identified a checkpoint called CTLA-4. Dr. Honjo found a different one, called PD-1. Those discoveries made it possible to develop drugs that would stop the checkpoints from working, so that the T-cells would be free to fight cancer. The process is often referred to as taking the brakes off the immune system. Ipilimumab was based on Dr. Allison’s work on the checkpoint CTLA-4. The later drugs work on PD-1. Former President Jimmy Carter received a checkpoint inhibitor, Keytruda, in 2015 when melanoma had spread to his brain and liver. His last scan, in June, showed no cancer, an aide said. A study published in August found that combining Yervoy and Opdivo significantly prolonged life for people in a desperate situation, with melanoma that had spread to the brain. But for all their successes, the danger is that these treatments can also turn the fury of the immune system against the patient’s own tissue, leading to side effects that can be severe. The lungs, intestines and sometimes even the heart have become inflamed. The thyroid gland can turn sluggish. Damage to the pancreas has caused diabetes in some patients. Others have developed rheumatoid arthritis. When the drugs were first introduced, side effects even caused some deaths. Doctors have learned to better control the problems. Overall, the side effects from ipilimumab, or Yervoy, are considered worse than those from the other checkpoint inhibitors. Describing the two researchers, Dr. Wolchok, a melanoma specialist who has worked with Dr. Allison, said: “They were basic scientists who were intrigued with the ways in which these mysterious T-cells behaved. They dug deeply to understand biologic pathways.” Dr. Wolchok treated some of the patients with advanced melanoma who were among the first to receive the drug based on Dr. Allison’s work. Dr. Allison is not a physician, and does not work directly with patients. One day in 2006, Dr. Wolchok called him and insisted that he leave his lab and head to the clinic. Nobel Prize Winning Scientists Reflect on Nearly Sleeping Through the Life-Changing Call How eight winners got the word. Oct. 4, 2015 There, Dr. Wolchok introduced him to a young woman who had been near death from melanoma, and who was now completely free of the disease — after only four doses of the drug Dr. Allison had developed. Dr. Allison wept. That woman, Sharon Belvin, went on to run half marathons. She has remained healthy, has two children and recently attended Dr. Allison’s birthday party, Dr. Wolchok said. Dr. Wolchok noted that although Dr. Allison’s and Dr. Honjo’s discoveries are based on the same idea, they involve separate braking mechanisms in the immune system. “These two pathways are very different,” he said. “That’s good. They’re non- redundant. If patients don’t have the desired outcome from one we can use the other one. It speaks to the multiple different molecular brakes that exist to keep this powerful set of cells and organs that we call the immune system under control.” When will the other Nobels be announced? • The Nobel Prize in Physics will be announced on Tuesday in Sweden. Read about last year’s winners, Rainer Weiss, Kip Thorne and Barry Barish. • The Nobel Prize in Chemistry will be announced on Wednesday in Sweden. Read about last year’s winners, Jacques Dubochet, Joachim Frank and Richard Henderson. • The Nobel Peace Prize will be announced on Friday in Norway. Read about last year’s winner, the International Campaign to Abolish Nuclear Weapons..
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