FGFR2 protein level was examined using immunohistochemistry and quantified in digitalized slides as described previously [20 (link)]. Immunohistochemical staining (IHC) was conducted on 5‐μm paraffin tumour sections using a mouse monoclonal anti‐FGFR2 antibody (H00002263‐M01; clone 1G3, Abnova, Taipei City, Taiwan). All slides were digitalized (Pannoramic 1000 Scanner, 3DHistech, Sysmex, Kobe, Japan) for quantification in 0–300 H‐score scale. Cases from 1st tercile of H‐score were regarded as FGFR2low and cases from 2nd and 3rd terciles were classified as FGFR2high.
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