"We got Leah's MIBG Scans back tonight and the doctors told us they didn't see any active disease in her body!!!," her dad wrote on Instagram.
"We still have to wait for her MRI and bone biopsy results later this week. But the doctors feel very optimistic about them because of the results from today. So for now we celebrate!!" he wrote.
Leah underwent surgery and chemotherapy after doctors found a cancerous growth in her abdomen in June, according to The Associated Press.
Still, 25, a defensive tackle, had originally been cut from the Bengals roster, but once the team learned his daughter had stage 4 cancer, they resigned him to their practice squad. He has since been placed on the active roster.