Evolution in the Presence and Evidence Category of Radiation Therapy Treatment Recommendations in the National Comprehensive Cancer Network Clinical Practice Guidelines in Oncology.

The frequency of recommendations for using RT in NCCN Guidelines has increased by >300% in the past 20 years among the 10 most common malignancies. Consideration of the quality of evidence supporting these recommendations by tumor type is useful to identify specific malignancies in need of higher-level evidence supporting the role of RT.