Cancer is not ONE THING. It's more than 100 separate diseases generically categorized for easy understanding by the public. The general commonality is that at the cellular level, a single cell begins to grow in an abnormal way and then proliferates. If this happens in the brain, it's very different from the pancreas or the prostate as these are different types of cells experiencing different mutations for different reasons in different individuals.
Glioblastoma has been "cured" in about 15% of the affected population that has certain genetic markers. Other specific cancers have seen significant progress in terms of therapy and treatment that will control and in some cases eliminate cancerous growths. Nothing is even close to working on all cancers and the things that are working - while in similar categories of approach - are vastly different from each other.
That's what the report said, they remove your current T-Cels and replace with T-Cels modified to attack what ever cancer cells you've got.
Maybe they have something that actually works.