Alternative Splicing|Carcinoma, Squamous Cell|Cell Line, Tumor|Cluster Analysis|Exons|Gene Expression Regulation, Neoplastic|Head and Neck Neoplasms|Humans|Hypoxia|Laminin|Oligonucleotide Array Sequence Analysis|Prognosis|RNA Splicing|Reverse Transcriptase Polymerase Chain Reaction|Sequence Analysis, DNA