I thought about it a bit before writing this post because I was (I am) afraid  of violating Yahoo's privacy a bit considering that it is the result of many private conversations we had but I decided to do it because I can't ignore it. Apologies in advance.

I've been in contact with yahoo for the entire period he talked about in original post, since before the first symptoms appeared and I can testify, even if I don't think there's the slightest need, that things went exactly as he described them; indeed he has failed to mention other further problems that he is facing which are by no means negligible.

I remember that at first he tended to underestimate what was happening to him and was also somewhat reluctant to follow the doctors' directions.
Then within about a month or so he became fully aware of the situation, thanks above all to his wife who insisted quite a bit in some moments to make him think about the situation.
Side note: how important it is to have someone who really cares about you!

Leaving aside the many things we talked about, I can say that Yahoo is truly an exceptional person: he has uncommon courage, lucidity and rationality in analyzing and evaluating a situation that was overwhelming him (correct me and forgive me if I'm wrong but that's how it is that I saw it).
I never heard him waver for a single moment even when he talked about his survival of the operation that he would have to go through.
Confronting myself with him I was ashamed of myself that sometimes I complain or take it out on problems or misadventures that don't even have a thousandth of the seriousness of those he's facing.

What clearly transpires even if he never told me openly is that he cares much more for his family than for his own fate.

I never thought I could care so much about someone I've never met in person, I trust him much more than many people who are close to me and I've known for a long time.

Keep it un man, stay strong , you have courage to spare.