Fig. 3: HER2 status in ctDNA plasma and tumor samples.

a–c, Samples were assessed by HER2 apCN (a), HER2 (b) and serum HER2ECD (c). Minimum and maximum are represented by the whiskers, the box represents the first–third quarters, the center represents the median and dots represent individual samples. ^aOnly HER2 plasma-detected samples are shown; all cohorts are included except for two patients from the exploratory cohorts whose HER2 test results were missing. ^bBaseline only (48 samples); all cohorts are included. ^cBaseline only (166 samples); all cohorts are included except for two patients from the exploratory cohorts whose HER2 test results were missing. CPM, counts per million.