EGFR and mesothelioma: 14R091 is a mesothelioma PDX model of the epithelioid subtype, which has high EGFR and mAb806 epitope expression by IHC (EGFR: H score > 200 and mAb806: H score 170) but lacks true EGFR amplification on Fluorescence in situ hybridization (FISH).