Yeah, I was at a talk ( I think a year or two ago ) by someone doing clinical trials of this technology for one variety of cancer in terminal children who had exhausted all means of treatment. The researcher reported very positive results, so I am pretty excited about it. It doesn't seem, based on what they were talking about that it would be applicable to every single type of cancer, and there are problems with cytokine storms after administration of the modified t-cells as they rapidly attack and kill the cancer cells and this causes other issues. But still the results were very very positive, and I believe many of the children are alive who were involved in the reported experiments.
Thanks for your comment @cristi :)