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Best plasma response versus best radiographic response. (A) Percent change in copies/mL of the EGFR driver mutation in plasma until best response is achieved. Best plasma response was defined as the first undetectable timepoint (N = 12) or the nadir timepoint with a subsequent increase at the next draw (N = 4). (B) Percent change in imaging until best response is achieved. Note that additional data following best response in plasma and on imaging were captured but not shown here.
