National Wilms Tumor Study Group

The National Wilms Tumor Study Group (NWTS) is a cancer research cooperative group in the United States formed to study a type of kidney tumor that affects children called Wilms' tumor. In 2001, NWTS merged with several other pediatric oncology cooperative groups to create the Children's Oncology Group (COG).

Source: Wikipedia — National Wilms Tumor Study Group (CC BY-SA 4.0)