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In a new study by Yale Cancer Center, researchers show stem-like T cells within certain lymph nodes could be natural cancer fighters. Targeting these T cells, which are a type of white blood cells, with immunotherapy drugs could increase the number of cancer patients that respond to treatment.The findings were reported online in the journal Science Immunology."Therapies that use the immune system to destroy cancer have been a game-changer for patients with lung and other cancers," said Nikhil Joshi, PhD, Assistant Professor of Immunobiology, a member of the Center of Immuno-Oncology at Yale Cancer Center, and senior author of the study. "But not all people respond to immunotherapy drugs, so it was important for us to discover the role of these special T cells in tumour growth."In this study, researchers first developed a new animal model where they could look at the stem-like T cells in tumours over the course of several months of tumour growth, and determine how the stem-like T cells survive. They discovered the stem-like T cells do not persist in the tumour for very long, which meant they are resupplied from somewhere else in the body. Nearby lymph nodes, an immune organ containing many of these stem-like T cells, were replenishing the supply.Every so often, a few stem-like T cells leave the lymph node and travel to the tumour. This keeps the tumour supplied with fresh cancer-fighting T cells. Researchers believe this is important for slowing the growth of cancer. An analysis of immune cells isolated from patients with lung cancer confirmed that stem-like T cells are in lymph nodes near the lung."T cells in tumours become exhausted, but our study results show the stem-like T cells within the nearby lymph nodes do not experience exhaustion during the course of the disease," said Kelli A. Connolly, a post-doctoral fellow at Yale Cancer Center and lead author of the study. "This could be an important treatment advance as the potential to respond to immunotherapy is preserved.""We are focused on developing therapies that will activate the stem-like T cells in the nearby lymph node and bring them into the fight against cancer," adds Joshi. "We plan to continue this work and focus on how to improve these therapeutic responses to help patients."( With inputs from ANI )Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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