The girl, who battled a stage 4 neuroblastoma, had a routine scan done Tuesday and Still was happy to later share that there were no signs the cancer had returned.
Before the tests, Still posted a picture of Leah in a party dress about to undergo the scan. He said they were hoping the fancy dress would be good luck and help ensure good results.
"She wanted to dress up pretty because if you look good you feel good and if you feel good you get good results," Still wrote on Instagram. "If that theory is right then I have nothing to worry about because she looks beautiful today."
The good news comes just weeks after Still accepted the ESPYs Jimmy V Perseverance Award on his daughter's behalf.