PFS was defined as the time period in months from the start of study treatment to the first observation of disease progression or death from any cause, whichever occurred first. Data for participants with no tumor assessments after baseline but who were still alive at the time of the clinical cutoff were censored at Day 1. Participants who underwent surgery after experiencing a sufficient shrinkage of the tumor, had any relapse, new occurrence of colorectal cancer, or who died were all considered as having had an event. Participants who underwent surgery without any such event were censored at the date of the last tumor assessment that documented neither a relapse nor a new colorectal cancer had occurred. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0), as a 20 percent (%) increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.

Intent-to-treat (ITT) population: all enrolled participants who received at least 1 dose of all study medications and had at least 1 measurable lesion according to the Response Evaluation Criteria In Solid Tumours (RECIST) criteria.

The percentage of participants with a best overall response of CR or PR according to RECIST. CR was defined as complete disappearance of all target lesions and non-target disease, with the exception of nodal disease. All nodes, both target and non-target, must have decreased to normal (short axis less than [<]10 millimeters [mm]). No new lesions. PR was defined as a greater than or equal to (≥) 30% decrease under baseline of the sum of diameters of all target lesions. The short axis was used in the sum for target nodes, while the longest diameter was used in the sum for all other target lesions. No unequivocal progression of non-target disease. No new lesions.

Subset of participants in the ITT population who had at least 1 post-baseline tumor assessment.

CR and PR were defined using RECIST v1.0. CR was defined as complete disappearance of all target lesions and non-target disease, with the exception of nodal disease. All nodes, both target and non-target, must have decreased to normal (short axis <10 mm). No new lesions. PR was defined as a ≥30% decrease under baseline of the sum of diameters of all target lesions. The short axis was used in the sum for target nodes, while the longest diameter was used in the sum for all other target lesions. No unequivocal progression of non-target disease. No new lesions.

ITT population.

PFS was defined as the time period in months from the start of study treatment to the first observation of disease progression or death from any cause, whichever occurred first. Data for participants with no tumor assessments after baseline but who were still alive at the time of the clinical cutoff were censored at Day 1. Participants who underwent surgery after experiencing a sufficient shrinkage of the tumor, had any relapse, new occurrence of colorectal cancer, or who died were all considered as having had an event. Participants who underwent surgery without any such event were censored at the date of the last tumor assessment that documented that neither a relapse nor a new colorectal cancer had occurred. Median PFS was estimated using the Kaplan-Meier method.

ITT population.

Time to overall response (CR or PR) was calculated as the time between the date of start of treatment until first documented response (CR or PR defined per RECIST v1.0). Participants who did not achieve CR or PR were censored at the date of progression, death, or at last adequate tumor assessment date. Median time to CR or PR overall response was estimated using the Kaplan-Meier method.

ITT population.

CR and PR were defined using RECIST v1.0 criteria. CR was defined as complete disappearance of all target lesions and non-target disease, with the exception of nodal disease. All nodes, both target and non-target, must have decreased to normal (short axis <10 mm). No new lesions. PR was defined as a ≥30% decrease under baseline of the sum of diameters of all target lesions. Short axis was used in sum for target nodes, while longest diameter was used in sum for all other target lesions. No unequivocal progression of non-target disease. No new lesions.

ITT population, only those participants who achieved a best overall response of CR or PR during first line treatment were included in the analysis.

For participants with a best overall response of CR or PR, the duration of overall response was measured from the time that the criteria for CR or PR (whichever occurred first) was met until the first date that progressive disease was objectively documented or until the date of death due to underlying cancer, whichever occurred first. Data for participants who did not have an event or who were alive without an objectively documented progressive disease were censored at the date of last adequate tumor assessment. Median duration of overall response was estimated using the Kaplan-Meier method.

ITT population, only those participants who achieved a best overall response of CR or PR during first line treatment were included in the analysis.

Stable response defined as participants with a best overall response of CR, PR, or stable disease (SD), defined using RECIST v1.0 criteria. CR was defined as complete disappearance of all target lesions and non-target disease, with the exception of nodal disease. All nodes, both target and non-target, must have decreased to normal (short axis <10 mm). No new lesions. PR was defined as a ≥30% decrease under baseline of the sum of diameters of all target lesions. The short axis was used in the sum for target nodes, while the longest diameter was used in the sum for all other target lesions. No unequivocal progression of non-target disease. No new lesions. SD defined as neither sufficient shrinkage to qualify for partial response nor sufficient increase to qualify for progressive disease, taking as reference the smallest sum longest diameter since the treatment started.

ITT population, only participants who achieved a best overall response of CR, PR, or SD during first line treatment were included in the analysis.

For participants with a best overall response of CR, PR, or SD during first line treatment, the duration of stable response was measured from the time that the criteria for CR, PR, or SD (whichever occurred first) was met until the first date that progressive disease was objectively documented or until the date of death due to underlying cancer, whichever occurred first. Data for participants who did not have an event or who were alive without an objectively documented progressive disease were censored at the date of last adequate tumor assessment. Median duration of stable response was estimated using the Kaplan-Meier method.

ITT population, only participants who achieved a best overall response of CR, PR, or SD during first line treatment were included in the analysis.

Treatment-failure was defined as discontinuation of treatment for any reason, including the following qualifying events: death due to any cause, adverse event, insufficient therapeutic response (progression of disease), failure to return (lost to follow-up), refusing treatment (participant non-compliance), being unwilling to cooperate and withdrawing consent (participant withdrew consent).

ITT population.

Time to treatment-failure was defined as the time from the first day of treatment to discontinuation of treatment for any reason, including: death due to any cause, adverse event, insufficient therapeutic response (progression of disease), failure to return (lost to follow-up), refusing treatment (participant non-compliance), being unwilling to cooperate and withdrawing consent (participant withdrew consent). For participants who did not experience a qualifying event, their data were censored at the earlier of either the date of last tumour assessment or the date of the last intake of study medication. Median time to treatment-failure was estimated using the Kaplan-Meier method.

ITT population.

Overall survival was defined as the time from the date of the first day of treatment until the date of death from any cause. If a participant was not known to have died, survival was censored at the last date the participant was known to be alive.

ITT population.

Overall survival was defined as the time from the date of the first day of treatment until the date of death from any cause. If a participant was not known to have died, survival was censored at the last date the participant was known to be alive. Median overall survival was estimated using the Kaplan-Meier method.

ITT population.

The percentage of participants who underwent surgery during the study period with an evaluation of their disease status after surgery. The surgery during the study period was described by reason: curative, palliative, biopsy, other, or unknown. Residual disease status after surgery was described as: no residual disease due to radical surgery, presence of residual disease, unknown or not applicable.

The 52 participant subpopulation of the ITT population who underwent surgery during the time period of the study.

The percentage of participants with a best overall response of CR or PR according to RECIST. CR was defined as complete disappearance of all target lesions and non-target disease, with the exception of nodal disease. All nodes, both target and non-target, must have decreased to normal (short axis <10 mm). No new lesions. PR was defined as ≥30% decrease under baseline of the sum of diameters of all target lesions. The short axis was used in the sum for target nodes, while the longest diameter was used in the sum for all other target lesions. No unequivocal progression of non-target disease. No new lesions.

The K-Ras and/or the B-Raf gene mutation status of participants was evaluated by the central laboratory using tumor samples. Wild-type participants did not have a mutation in either gene.

ITT population; only participants with a known K-Ras and/or B-Raf gene mutation status and at least 1 post-baseline tumor assessment. Number (n) equals (=) number of participants with either wild-type or K-Ras/B-Raf gene mutation.

Quality of life (QoL) assessments were used to derive pre-specified QoL scores according to the QoL manual "EQ-5D-3 Level (3L)" user guide for instrument version 4.0. The EQ-5D is a participant rated questionnaire to assess health-related quality of life in terms of a single index value. The visual analog scale (VAS) component rates current health state on a scale from 0 (worst imaginable health state) to 100 (best imaginable health state); higher scores indicate a better health state. The overall health score absolute changes were calculated for each participant as follows: (score at the end of treatment minus score at baseline). EQ-5D health states were converted into EQ-5D-3L raw index value by applying the scoring algorithm based on the European EQ-net VAS set. The raw index was chosen instead of rescaled index, since the questionnaire was used in order to obtain a quality of life assessment. The raw index scores ranged from 0 (worst health state) to 100 (best health state).

ITT population, only participants who had EQ-5D-3L scores for both baseline and last visit were included in the analysis.