NCCN Categories of Evidence and Consensus

• Category 1: Based on high-level evidence and uniform consensus.
• Category 2A: Based on lower-level evidence including clinical experience and uniform consensus.
• Category 2B: Based on lower-level evidence including clinical experience and nonuniform consensus (but no major disagreement).
• Category 3: Based on any level of evidence but reflects major disagreement.

All recommendations are category 2A unless otherwise noted.

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