A Study in Head and Neck Cancer

September 27, 2013 is the date when data was last collected for the primary endpoint. Prior to this date, the manufacturing process for the BI-manufactured cetuximab was changed necessitating the need to switch participants to US commercial cetuximab. All other components of their treatment regimen remained unchanged and participants stayed in their original reporting group. Therefore, the number of participants in the BI-manufactured cetuximab treatment arm who had TEAEs includes TEAEs while participants received BI-manufactured and US-commercial cetuximab. Using September 27 cut-off, the analysis of TEAEs is confounded by the switch from BI-manufactured to US commercial cetuximab. TEAEs were defined as serious and other non-serious AEs that occurred or worsened after study treatment (regardless of causality). TEAE information for Safety Lead-In group available in Reported Adverse Events module which is summary of serious and other non-serious AEs regardless of causality.

January 23, 2013 is the date when the first participant in the BI-manufactured cetuximab treatment arm switched to US commercial cetuximab due to changes in the manufacturing process for the BI-manufactured cetuximab necessitating the need to switch participants to US commercial cetuximab. Each participant who switched treatments received at least 2 cycles of BI-manufactured cetuximab before switching. All other components of their treatment regimen remained unchanged. The number of participants who had TEAEs during combination therapy is reported. Using January 23 cut-off, data is un-confounded by lack of BI-manufactured cetuximab. TEAEs were defined as serious and other non-serious adverse events (AEs) that occurred or worsened after study treatment (regardless of causality). TEAE information for Safety Lead-in group available in Reported Adverse Event module which is summary of serious and other non-serious AEs regardless of causality.

OS was defined as duration from the date of randomization to the date of death from any cause. For each participant not known to have died as of the 23 October 2014 data cutoff date for the analysis, OS was censored at the date last known to be alive. In addition, any participants on Arm B who was switched from BI-manufactured cetuximab to ImClone-manufactured cetuximab was censored at the time of the switch.

PFS was defined as duration from the date of randomization to the first date of objective progressive disease (PD) or death from any cause. For each participant who was not known to have died or to have had objective PD as of the 23 October 2014 data cutoff date for the analysis, PFS was censored at the date of the participant's last complete tumor assessment prior to that cutoff date. In addition, any participant in Arm B who was switched from BI-manufactured cetuximab to ImClone-manufactured cetuximab was censored at the time of the switch.

Response was defined using Response Evaluation Criteria In Solid Tumors (RECIST, version [v]1.0) criteria. CR was defined as the disappearance of all target lesions. PR was defined as having at least a 30% decrease in sum of longest diameter of target lesions. Percentage of participants with a confirmed CR or PR=(number of participants whose best overall response was CR or PR)/(number of participants treated)*100.

Response was defined using RECIST, v1.0 criteria. CR was defined as the disappearance of all target lesions. PR was defined as having at least a 30% decrease in sum of longest diameter of target lesions. Progressive Disease (PD) was defined as having at least a 20% increase in the sum of the longest diameter of target lesions. Stable Disease (SD) was defined as small changes that did not meet the above criteria.

The Cmax of cetuximab following 400 mg/m² cetuximab dosing during Part 2 of the study is reported. As specified in the protocol, pharmacokinetics (PK) samples were not collected during Part 1 of the study, Safety Lead-In or during Part 2 monotherapy.

A total of 4 samples were collected at various times during combination therapy, from the third dose of 250 mg/m^2 cetuximab in Cycle 1 (Week 3) through the final dose in Cycle 3 (Week 3) and used to report Cmax of cetuximab at steady state during Part 2 of the study. As specified in the protocol, PK samples were not collected during Part 1 of the study, Safety Lead-In, or during Part 2 monotherapy.

A total of 4 samples were collected during combination therapy, from the first dose of 250 mg/m^2 cetuximab in Cycle 1 (Day 1) through the final dose in Cycle 3 (Week 3) and used to report AUC of cetuximab at steady state during Part 2 of the study. As specified in the protocol, PK samples were not collected during Part 1 of the study, Safety Lead-In, or during Part 2 monotherapy.