For the first time in 17 months, Robin Quivers returned to her spot in the studio on the Howard Stern show ... with Howard telling his BFF, "Never get sick again."
As we previously reported, Quivers had been participating on the show from her home ... while she was being treated for cancer.
But Quivers says she's cured -- and today, she returned to her famous glass box in Howard's studio to participate on SiriusXM radio show.
"Seriously, I've been praying for this day ... and I'm really happy that you are here," Howard said.
He continued, "Honestly, I did not think this day would come."
"I was very very depresed over your illness. I wasn't sure what the outcome was going to be. There was a time I really did think I was going to lose you permenantly. And I'll tell you what, this is a pretty remakable day that you are here triumphant and cured. I never would have predicted this. Honestly."