The leader of the internationally known Christian band Casting Crowns is asking for prayer after doctors scheduled emergency surgery to remove a kidney.

Mark Hall posted a note on the band’s website where he said doctors found a mass in his kidney that they are “90 percent sure” is cancerous.

“Doctors found a solid mass in my right kidney about a week ago. They are 90% sure it’s cancer and they are going to remove the entire kidney next Wednesday, March 11th. They believe the cancer is contained in the kidney, which is also a great hope. They will know more once it is out and Pathology can see it,” he continued.

“I’ll be in recovery for a month or a little longer because of the surgery. Please pray for healing and for God’s peace for my family. Praising Him in This Storm,” Hall ended the appeal in a nod to one of his band’s more popular songs “Praise You In This Storm”.

The band, consisting of seven youth pastors, has been touring and releasing songs since 1999.  They have won a Grammy award and 15 Dove awards.