"We have been so overwhelmed with the outpouring of love, support, thoughtfulness & prayers," Leakes wrote.
"So far, Gregg is doing great! He feels good with the exception of not being able to eat a lot. The cancer was removed! Now we have to decide whether we do chemo or not?"
"Thank you so much to the ladies i work with and have worked with in the past for sending gifts, love and just good ole words of encouragement," she added, tagging Zolciak and several other current and former co-stars.
"We hope you all know that this means a lot."
Leakes and Zolciak clashed during "The Real Housewives of Atlanta" Season 10 after Zolciak's daughter Brielle Biermann posted a video of alleged cockroaches in Leakes' home.
Leakes rejected an apology from Zolciak in April.
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"Please file a lawsuit Chile! Like I'm begging you," she responded. "You can never WIN when you play DIRTY so throw in the towel! I mean throw in the lips."
Leakes announced Gregg's diagnosis in an Instagram post Wednesday. She shared a photo of her husband at the MD Anderson Cancer Center in Houston.
"Our New Normal and the fight begins," the star wrote on Instagram. "#mdandersoncancercenter #yougotthis #iloveyou."
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