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Comparison of (a) the frequency of EGFR mutation 
, Exon 19; 
, Exon 21; 
, Others and (b) PD‐L1 expression level between solid and micropapillary subtypes. P‐values by χ2 tests (a), by Mann‐Whitney U test (b). Each dot represents one patient. Error bars represent the median ± quartile rage.
