ST. LOUIS, MO (KTVI)-- Hundreds of people gathered for a "flash mob" below the hospital window of an ill boy on the eve of a major surgery.
16-year-old Seth Lange is having a bone marrow transplant Tuesday. He has been fighting Leukemia for two years.
"It's been an emotional roller coaster over that time," his mother Stacy Vogt said.
The flash mob sang songs, chanted and prayed as Seth looked out of his hospital window.
"The goal is to get him smile and remind him that he is not alone," organizer Shawn Kohrs said. "I just love that kid."
Kohrs is the same man who helped lead the "Thumbs Up For Lane" campaign.
Lane Goodwin died of cancer in 2012, but not before he inspired Kohrs to help create awareness about childhood cancer.
"It all goes back to Lane," Kohrs said. "I can't cure cancer, but I can help these kids smile."
The flash mod idea was promoted by Kohrs on Facebook.
"I wanted to do something big, but he is in isolation before the transplant," Kohrs said. "No one can see him, so I thought I'd do a flash mob."
Stara Lockard attended the flash mob.
"I follow Seth on Facebook, and the one thing about him is that great smile," she said.
Seth's mother said all the support was "amazing."
After the flash mob left Seth said that he wanted to "thank everyone" for the support.
His transplant is scheduled for 8 p.m.