A Randomised, Double-blind, Placebo-controlled, Phase III Study to Evaluate the Efficacy and Safety of Afatinib (BIBW 2992) as Adjuvant Therapy After Chemo-radiotherapy in Primary Unresected Patients With Stage III, IVa, or IVb Loco-regionally Advanced Head and Neck Squamous Cell Carcinoma

Disease Free Survival (DFS)

Time Frame: up to 4 years

DFS, defined as the number of days from the date of randomisation to the date of tumour recurrence/ Second Primary Tumours (SPT) or death from any cause, whichever occurred first. For patients with known date of tumour recurrence/SPT (or death), the event date was the date of tumour recurrence/SPT or the date of death, whichever came first, i.e. DFS \[day\] = minimum (date of tumour recurrence/SPT, date of death) - date of randomisation +1. For patients known to be alive and without tumour recurrence/SPT by the end of trial or follow-up visit, they were censored at the date of last imaging when the patient was known to be disease-free and alive: DFS (censored) \[days\] = date of last imaging when the patient was known to be diseasefree and alive - date of randomisation + 1. The Kaplan-Meier (KM) method was to be used to estimate the median DFS for each treatment group. 95% confidence interval (CI) was to be constructed using the Greenwood variance estimate.