BCL2L1 and head and neck squamous cell carcinoma: We tested whether integrative analysis was a reliable method to predict in vivo protein expression by analyses of two genes (BCL2L1 encoding an apoptosis regulator and CLDN1 encoding a component of tight junctions in epithelia) that showed a high frequency of copy number gains in HNSCC but were discordant with respect to correlation of copy number with gene expression in this study.