[permanent]

in short, money and ethics

[vikramkr]

The former is a reason why there actually is a lot of research into this already/couple drugs approved (cancer is usually very profitable), the latter is why all drugs, not just these, need extensive clinical trials and strong regulation. Because it's measles virus and herpes virus etc etc, and often genetically engineered, so the safety risks are ... obvious

[OutOfHere]

Real ethics isn't what you think it is. Real ethics is in getting the treatment asap to everyone that it can save.