This has to be some scam, like 99.9% of "blockchain technology". Why would a data structure has anything to do with cancer? What difference it makes to the sick how is their data stored - on blockchain or in regular database? It's such a negligible detail that it's not going to affect absolutely anything. These blockchain scammers are just preying on suckers who think that if they will invest in something with cutting-edge buzzwords in it, they will become rich in an instant.
I understand that you see only the cover of the book. However, I don't think that this is a scam. first of all, Corona-Swiss Ltd is a big company with a good reputation. Why do they need to drag their name into a wrong path that might lead them to jeopardy? The effect on the project might not be visible in the short run but in the long run. Cancer infected individuals today maybe having a hard time to find a cure and they have a big possibility that they will be succumbed by it. But what about tomorrow? Are you not open to the idea that in the future, the number of individuals died because of cancer will be from decreasing to eradicated?
Medical System nowadays has limits. The project is opted to use the blockchain because is so sensitive and confidential data that might be used for illegal activities of some individuals who do not have specialization in this kind field - just to earn money.
The scoop of the project is not limited to patient-doctor doctor-patient only, but it includes the professional medical researchers, insurance companies, NEC, Regulators, etc.