Der blev ikke foretaget immunohistokemisk påvisning af EGFR, da mere end 90% af patienterne med planocellulært carcinom i hoved og hals havde tumorer, som var EGFR- positive.
Immunohistochemical detection of EGFR expression was not performed since more than 90% of patients with squamous cell cancer of the head and neck have tumours that express EGFR.