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.
However, the NWTS is still active in name today completing follow-up of the late effects of treatment for patients previously enrolled in its trials.
The NWTS was formed in 1969[1] by member institutions from Children's Cancer Study Group (CCG), Southwest Oncology Group (SWOG), and CALGB, the latter two which later merged to form the Pediatric Oncology Group (POG).
The NWTS was created with the purpose of improving survival of children with Wilms' tumor.
NWTS studies were conducted at over 250 pediatric oncology treatment centers in the United States, Canada, and other countries.