My Mayo-trained oncologist has never said anything about this.

May I ask, what's your source?

Taking questions to our doctors -- not Google -- is always best.

It's true that, once you have an MPN diagnosis, the American Red Cross will no longer accept your blood donations. This is not because handling your blood puts anyone at risk.

Instead, it's that no one knows yet whether putting your blood into someone else's bloodstream might initiate an MPN.

Yes, there are lots of unanswered questions about our weird blood cancers!