Figure 1From: The hypoxic tumor microenvironment and drug resistance against EGFR inhibitors: preclinical study in cetuximab-sensitive head and neck squamous cell carcinoma cell linesCytotoxic effect of erlotinib. Dose–response curves of LICR-HN2 (a), LICR-HN5 (b) and SC263 (c) cells after 72 h of erlotinib treatment under normoxia and hypoxia (24 and 72 h).Back to article page