a trend towards significanceP=0.075
Analysing data from in vitro drug screening of these cell lines, through the Genomics of Drug Sensitivity in Cancer project (GDSC; release 6.1 52 ), we found afatinib IC50 values to be widely distributed among HER2 mutant cell lines, with a trend towards significance with afatinib sensitivity when compared with HER2 wild-type cancer cell lines (P=0.075; 9 HER2 mutant cell lines tested).