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DAVID W. SCOTT<br />

FIGURE 2. Immunohistochemistry-Based Assays for COO Assignment<br />

The four immunohistochemistry-based algorithms that were trained against gold standard gene expression profiling are shown. Accuracy is defined as the concordance with the gold standard.<br />

Sensitivity and specificity are shown for the ABC subtype--as they are binary assays, the specificity for ABC is the sensitivity for GCB, whereas the sensitivity for ABC is the specificity for GCB.<br />

The positive predictive value (PPV) and negative predictive value (NPV) are for the ABC subtype. The performance values are determined from independent validation cohorts, except where<br />

marked with an *, where they are from the training cohort and thus may overestimate the performance of the assay.<br />

e462<br />

2015 ASCO EDUCATIONAL BOOK | asco.org/edbook

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