JDR
IMO no problem with sending a PM although as Anne Marie noted, posters on sabbatical wouldn't read it). If their profile has a private email, you could also use that since the poster has chosen to let that information be active and available to the public.
I like to think that such posters have recovered so much from this terrible cancer that it's more a bad memory than a chronic illness. I don't post as often as I used to primarily because some responses are better off as positive success stories. I don't want to bum people out when they ask about recovering from TX and/or dreading a recurrence when a lump or symptom reappears. On the other hand, I feel it's comforting for some posters to be able to compare their recovery very favorably to mine. More importantly, I continue to post so that new OCF members can realize that even if their worse nightmare comes true and the cancer does come back after TX when they thought it was all gone, that life can still be good.
Charm