Polyunsaturated fatty acids (PUFAs), and especially some omega PUFAs, are recognized for their myriad health benefits, but their role in the biology of cancer cells and tumor immunity has been less clear. The results of a preclinical study by researchers at Yale University School of Medicine now indicate that some omega fatty acids can restrain the cancer-killing capabilities of natural killer (NK) cells by acting through a receptor, LRP5. In th…