To test for TGF-β2 mRNA induction in a distinct set of HNSCC patient-derived xenografts (PDX), we obtained RNA from 4 HNSCC PDX models (CUHN002, CUHN004, CUHN013, CUHN027) that were propagated in nu/nu mice and treated for 4 weeks with vehicle control or the EGFR monoclonal antibody, cetuximab. The gene discussed is EGFR; the disease is head and neck squamous cell carcinoma.