PFS was defined as the time from randomization until the date of progressive disease (PD) or death from any cause. Participants who were alive and without progression were censored at the date of their last tumor assessment. PFS was assessed by the independent review committee (IRC) in the Pemetrexed group (Cetuximab & Pemetrexed versus Pemetrexed) and by the investigator in the Docetaxel group (Cetuximab & Docetaxel versus Docetaxel).

The intent-to-treat population (ITT) included all participants classified according to the treatment arms into which they were randomized, regardless of the actual treatment received. Censored participants: 10 in Cetuximab + Pemetrexed arm; 25 in Pemetrexed arm; 6 in Cetuximab + Docetaxel arm; 16 in Docetaxel arm.

OS was defined as the time from randomization to death. Participants without a date of death were censored on the last date participants were known to be alive, or lost to follow-up.

The intent-to-treat population (ITT) included all participants classified according to the treatment arms into which they were randomized, regardless of the actual treatment received. Censored participants: 24 in Cetuximab + Pemetrexed arm; 43 in Pemetrexed arm; 12 in Cetuximab + Docetaxel arm; 22 in Docetaxel arm.

The best overall response rate (ORR) was the proportion of randomized participants with a best OR of CR or PR, according to modified World Health Organization (WHO) guidelines. It was calculated as the total number of participants with CR or PR divided by the total number of participants treated in that arm. Participants with no post-baseline evaluation were considered as non-responders. The tumor response was assessed by the independent review committee (IRC) in the Pemetrexed group and by the investigator in the Docetaxel group.

The intent-to-treat population (ITT) included all participants classified according to the treatment arms into which they were randomized, regardless of the actual treatment received.

The disease control rate (DCR) was the proportion of randomized participants with a best OR of CR, PR or SD according to modified World Health Organization (WHO) guidelines. It was calculated as the total number of participants with CR, PR or SD divided by the total number of participants randomized in that arm. The tumor response was assessed by the independent review committee (IRC) in the Pemetrexed group and by the investigator in the Docetaxel group.

The intent-to-treat population (ITT) included all participants classified according to the treatment arms into which they were randomized, regardless of the actual treatment received.

The FACT-LCS is a set of 7 questions to inventory problems specific to lung cancer symptoms. Participants rate each item on a 5-point Likert-type scale from 0 (not at all) to 4 (very much). Scores range from 0-28 and higher score indicates fewer symptoms. Symptom response (improvement) was defined as ≥2 point increase from baseline in the 7-item LCS score that was maintained for 2 consecutive assessments at least 3 weeks, and not >5 weeks apart for participants, whose baseline LCS score was ≤26. Symptom response rate was the percentage of participants with symptomatic response.

The randomized participants with baseline LCS scores less than or equal to 26.

The FACT-LCS (see description in Outcome measure 5) inventories problems specific to lung cancer symptoms. Using this Scale, Symptom progression = a ≥ 2 point decrease from baseline in LCS score maintained for 2 consecutive assessments ≥3 weeks, and <5 weeks, apart. The symptom progression date = the first of 2 consecutive assessments with a ≥2 point decline. Time to symptomatic progression = the time from randomization to the symptom progression date. For participants with no symptom progression, time to symptomatic progression was censored the date of last symptom assessment.

All randomized participants with a baseline LCS >= 2 were included. Censored participants: 237 in Cetuximab plus Pemetrexed arm; 244 in Pemetrexed arm; 126 in Cetuximab plus Docetaxel arm; 131 in Docetaxel arm.

The duration of response, in participants with best OR of complete response (CR) or partial response (PR), was measured from the date criteria are met for CR/PR (not confirmation date, whichever was first recorded), until the first occurrence date that the criteria of progressive disease (PD) was met, or death. Participants who were alive and without progression were censored at the date of their last independent review committee (IRC) tumor assessment. The tumor response and progression were assessed by the IRC in the Pemetrexed group and by the investigator in the Docetaxel group.

All randomized participants with a best overall response of CR or PR. Censored participants: 1 in Cetuximab plus Pemetrexed arm; 2 in Pemetrexed arm; 1 in Cetuximab plus Docetaxel arm; 0 in Docetaxel arm.

National Cancer Institutes-Common Toxicity Criteria version 3.0 was used by investigators to assess participant toxicities. Mapping of investigator verbatim terms to CTCAE terms was done by the sponsor/designee using CTCAE v4.0. Participants reported had grade 3 or 4 toxicities (or both potentially). Grade 3 AEs: severe or medically significant but not immediately life-threatening;hospitalization or prolongation of hospitalization indicated; disabling; limiting self care activities of daily living. Grade 4 AEs: life-threatening consequences; urgent intervention indicated.

All randomized participants receiving at least 1 dose of study drug made up the safety population for this outcome measure. Investigators graded events using CTCAE v3.0. Mapping of investigator verbatim terms for toxicity to CTCAE terms was done by the sponsor/designee using CTCAE v4.0.