Novel cancer drugs that harness an individual’s own immune system to fight cancer are showing incredible promise in some patients, but researchers don’t fully understand why these immunotherapies work for some people and not others. Animal models that imitate the human immune system will help in the study of the effects of these drugs. The National Cancer Institute at NIH said it will start a new large-scale program in 2017 to study experimental immunotherapies in dogs with cancer.  (MIT Technology Review)