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Leah Still, the daughter of Cincinnati Bengals defensive tackle Devon Still, encountered a recent complication from stem cell treatment.

The Bengals defender shared the news via his Instagram account:

WLWT.com noted that Leah, 5, was diagnosed with neuroblastoma, which is a rare form of pediatric cancer. The Stills learned that her cancer was in remission in March, but she still required this stem cell treatment that was expected to last four to six weeks, beginning in early May.

The one silver lining that Still mentioned in his Instagram post was the fact that doctors apparently caught the complication early. The overall goal of the treatment “is to stimulate new bone marrow growth for Leah and reduce the possibility of a relapse,” per WLWT.com.

The Bengals made headlines during the 2014 football season when they raised more than $1 million to fight pediatric cancer in honor of the Stills. The team sold Still’s No. 75 jersey and donated 100 percent of all the sales toward the fight.

That jersey served as an uplifting symbol throughout the season and a reminder of Leah’s strength and perseverance. The Stills will be in the minds of sports fans everywhere as Leah battles through this complication.