Hi Sara. I had CAR-T in spring 2018 for DLBC, which appeared a few months after my stem cell transplant. It was painless and quick to administer. The cells were transfused over four weeks. Each week was about 300,000,000 cells and the whole procedure was over pretty quickly. Over the 4 weeks I was given 1.2 billion cells and they completely destroyed the tumour in my colon in about 7 or 8 months, without the horrible side effects I had experienced after chemo and radiotherapy. I hesitate to say there is nothing to worry about, and appreciate that everyone is different and reacts differently to treatments, but I personally found it one of the easiest of the many treatments I had over a period of about 18 months when ill. Good luck with whatever treatment you have. Paul.