An editorial in the June 11th edition of Nature does two things remarkably well: it offers hope for the future of stem cell science while explaining why it takes so long to get things right.
Headlined “Good practice” the Nature piece explains why: “… shortcuts are simply not possible, despite charlatan claims. It takes time to learn how to coax stem cells — either from human embryos or from reprogrammed adult cells known as induced pluripotent stem (iPS) cells — to develop into the right sort of replacement cell. It also takes time to work out how to get these cells to integrate into the host tissue and to function. And the steps required to work out how many replacement cells need to be delivered, and how to deliver them safely, cannot be rushed …”