Joe was diagnosed with stage 4 prostate cancer last May.Credit: GettyThe GistFormer First Lady Jill Biden shared an update on her husband Joe Biden’s cancer battle.“He just had scans, and they were very optimistic,” she said.Joe was diagnosed with stage 4 prostate cancer last May.Former First Lady Dr. Jill Biden has given an update on her husband’s heath amid his ongoing cancer battle.“Well, he just had scans, and they were very optimistic,” she…