I'm so glad I found this site. I was treated over 20 years ago for breast cancer---aggressive radiation and chemo after mastectomy/removal of lymph nodes. The loss of feeling in my right hand (dominant) started about 2 years ago. Some of my health care providers thought it was due to arthritis (I have that in R wrist also). I have a friend who is a PM&R physician--she found this condition--RIBP. I finally have may oncologist believing this is it, but educating the medical professionals about it is very frustrating. And like many of you have expressed--the thought that this is progressive is depressing. I've tried gabapentin and nortriptyline. My oncologist just certified me for medicinal cannabis. Interesting process to be officially approved--and the choices of "product" are confusing. Has anyone tried it?