DNAJA3 and non-small cell lung carcinoma: To test our hypothesis that hnRNP A1 and/or A2 may be involved in the alternative splicing of Tid1 isoforms in NSCLC, we transfected A549 cells with siRNAs targeting hnRNP A1 and/or A2, and assessed the expression levels of the Tid1 isoforms using qRT-PCR and Western blot analyses.