<i>PTPRD</i> copy number alterations are frequent across cancers but are not associated with <i>PTPRD</i> mRNA expression in HNSCC.

<p>(A) Copy number alteration of <i>PTPRD</i> in human cancers as determined by TCGA. (B) <i>PTPRD c</i>opy number alterations do not correlate with altered <i>PTPRD</i> mRNA expression in HNSCC. A Jonckheere-Terpstra test was performed using StatXact software (Cytel, Cambridge, MA).