Quinn Waters, also known as "The Mighty Quinn," was named the Boston Bruins honorary banner captain during Wednesday night's game amid news that his tumors are shrinking.
The five-year-old from Weymouth, Massachusetts, is responding to treatment after he began another battle against cancer in February. Quinn was diagnosed with a medulloblastoma, a tumor on the brain stem, in 2019, according to a Facebook page in his name.
"Well we got some great news today, the MRI results from MGH-1 tumor is completely gone and the second one is 95% gone," a Facebook post from the game reads. "He’s still got a road ahead of him but he tackled Heartbreak Hill without breaking a sweat!"
Quinn served as banner captain during Game 3 in the Stanley Cup Playoff series, where the Bruins beat the Washington Capitals 3-2 in double overtime. Every game in the first round of the series so far has gone into overtime.
Facebook video showed Quinn and his family celebrating the nail-biting win.
The Bruins were down 2-1 late in the third period when Brad Marchand knocked in the game-time goal. It remained a tight game until Craig Smith scored the game winner, giving the Bruins a 2-1 series lead Wednesday night.
The team now has an opportunity to take a 3-1 series lead in Friday night's Game 4 in Boston at 6:30 p.m.
The Boston Bruins Twitter account posted that the team was off to a "Mighty strong start" with Quinn as their banner captain.
Quinn's family is advocating for blood and platelet donations at the Boston Children's Hospital Blood Donor Center.