Fig. 4
From: EGFR as a biomarker of smoking status and survival in oropharyngeal squamous cell carcinoma
Droplet digital PCR expression of EGFR in oropharyngeal squamous cell carcinoma. EGFR levels are shown in smokers vs non-smokers according to a EGFR copy number and b EGFR gene expression. EGFR levels are further shown stratified in patients who are current smokers, ex-smokers and non-smokers by c copy number, d gene expression, e copy number in p16 positive vs negative patients and f gene expression in p16 positive vs negative patients. EGFR gene expression in shown as a value normalized with EEF2 expression