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. 2023 Nov 14;6(11):e2343285. doi: 10.1001/jamanetworkopen.2023.43285

Table 1. National Comprehensive Cancer Network (NCCN) Categories of Level of Evidence and Consensus and Treatment Preference Ratings.

NCCN ratings NCCN definition
Level of evidence and consensus
1 High level evidence with uniform panel consensus (>85% of votes)
2A Lower level evidence with uniform panel consensus (>85% of votes)
2B Lower level evidence without uniform consensus (50%-85% of votes)
3 Any level evidence but with major disagreement (25%-50% of votes)
Treatment preference
Preferred Based on superior efficacy, safety, and evidence and, when appropriate, affordability
Alternative preferred No definition given
Other recommended May be somewhat less efficacious, more toxic, or based on less mature data; or significantly less affordable for similar outcomes
Useful in certain circumstances May be used for select patient populations defined with recommendation