New article on Home Page: State of CML Treatments.

I read this article this morning, unrelated to seeing this post, and was interested in this piece of it [talking about the genesis of the Ph+ chromosome in an individual]:

"How and why that happens is probably what we know least about, but suffice it to say, it is probably a fairly common genetic error that happens during a chromosome exchange during cell division and leads to a malignancy. Why we see this genetic error in many more patients than we actually see diagnosed with CML is not clear"

I wasn't aware it may be "fairly common" but was aware that traces of BRC/Abl have been detected in people who do not have CML. Does anyone know any more on this topic?