As far as adenocarcinoma groups are concerned, EGFR mutations were more frequent in lepidic (4 out of 19 samples, 21%), micropapillary (either pure or mixed) (2 out of 6 samples 33%), non-mucinous in situ AdCa (2 out of 4 samples 50%), while in all other groups the percentage ranged from 8 to 16% (Table 4), but no statistical correlations were elicited. Here, EGFR is linked to adenocarcinoma.