All informative pairs were concordant either for the norm (32 of 36 pairs) or for the presence of EML4-ALK gene fusion (4 of 36 pairs).     ///    RNA extraction followed by reverse transcriptase-polymerase chain reaction analysis for the EML4-ALK translocation was performed for 44 EGFR mutation-negative sample pairs.     ///    Detection of EGFR mutations and EML4-ALK rearrangements in lung adenocarcinomas using archived cytological slides.. 