Phase Ib/II Study of Efficacy and Safety of MEK162 and Panitumumab, in Adult mCRC Patients With Mutant or Wild-type RAS Tumors

An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An SAE was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent are events between first dose of study drug and up to 28 days after last dose that were absent before treatment or that worsened relative to pretreatment state.

Vital sign abnormalities criteria included: 1) Systolic blood pressure (SBP) in millimeters of mercury (mmHg): greater than or equal to (>=)180 mmHg or less than equal to (<=) 90 mmHg with increase or decrease from baseline of >=20 mmHg with high and low post baseline values; 2) Diastolic blood pressure (DBP) (mmHg): >=105 mmHg or <=50 mmHg with increase or decrease from baseline of >=15 mmHg with high and low post baseline values; 3) Pulse rate in beats per minutes (bpm): >=120 bpm or <=50 bpm with increase or decrease from baseline of >=15 bpm with high and low post baseline values; 4) Weight in kilogram: >=10% increase or decrease from baseline with high and low post baseline values; 5) Oral body temperature in degree Celsius (C) : >=39 degree C or <=35 degree C with high and low post baseline values. Categories, with at least 1 participant having vital sign abnormality in any of the reporting arms, were reported in this outcome measure.

ECG abnormalities criteria included: 1) QTc interval adjusted according to Bazett formula (QTcB) in millisecond (msec): greater than (>) 450, >480, >500, increase from baseline >30, increase from baseline >60; 2) QTc interval adjusted according to Fridericia formula (QTcF) (msec): >450, >480, >500, increase from baseline >30, increase from baseline >60; 3) Heart rate (bpm): RR decrease >25% and to a VR (interval between QRS wave and T wave on ECG) >100; RR (interval between 2 successive R waves on ECG) increase >25% and to a VR <50; 4) Pulse rate (msec): increase >25% and to a value >200; 5) QT (msec): >450, >480, >500, increase from baseline >30, increase from baseline >60; 6) QRS (msec): increase >25% and to a value >110. Categories, with at least 1 participant having ECG abnormality in any of the reporting arms, were reported in this outcome measure.

Following parameters were analyzed for laboratory examination: hematology (hematocrit, erythrocytes); biochemistry (direct bilirubin, blood urea nitrogen, calcium, creatine kinase, triiodothyronine, thyroxine and thyrotropin). Clinical significance of laboratory abnormalities were judged by investigator.

ORR: percentage of participants with a best overall response (BOR) of complete response (CR) or partial response (PR) as assessed per RECIST version 1.1. BOR: the best response recorded from the start of the treatment until CR or PR. CR: disappearance of all non-nodal target lesions and of all non-target lesions. In addition, any pathological lymph nodes assigned as target lesions/ non-target lesions must have a reduction in short axis to <10 mm. PR: at least a 30 percent (%) decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters.

PFS: time from date of randomization to date of first documented PD or death due to any cause, whichever occurred first. RECIST 1.1, PD:>=20% increase in sum of diameter of all measured target lesions (TLs), taking as reference smallest sum of diameter of all TLs recorded at or after baseline, sum must also be absolute increase of >=5 mm^2. Unequivocal progression of existing non-TLs. Appearance of new lesions. With no event at time of analysis cut-off or at start of any new anti-neoplastic therapy, PFS was censored at date of last adequate tumor assessment of complete response (CR), partial response (PR) or stable disease (SD). CR:disappearance of all non-nodal TLs/non TLs, any pathological lymph nodes as TLs/non TLs must have reduction in short axis to <10 mm. PR:>=30% decrease in sum of diameter of all TLs, referring baseline sum of diameters. SD:neither sufficient shrinkage to qualify for PR or CR nor increase in lesions qualified for PD. Kaplan-Meier method used for PFS analysis.

DOR: time from first documented occurrence of response (PR or CR) until date of first documented PD or death due to underlying cancer. RECIST 1.1. CR: disappearance of all non-nodal target lesions and of all non-target lesions. In addition, any pathological lymph nodes assigned as target lesions/ non-target lesions must have a reduction in short axis to <10 mm. PR: at least a 30% decrease in sum of diameter of all target lesions, taking as reference baseline sum of diameters. PD: at least a 20% increase in sum of diameter of all measured target lesions, taking as reference the smallest sum of diameter of all target lesions recorded at or after baseline. In addition to the relative increase of 20%, sum must also demonstrate an absolute increase of at least 5 mm^2. Unequivocal progression of existing non-target lesions. Appearance of new lesions. Participants with no PD and were still alive, were censored at last adequate tumor assessment. Kaplan-Meier method was used for DOR analysis.

DCR was defined as the percentage of participants with a confirmed BOR of CR, PR, or stable disease (SD). RECIST 1.1, BOR was defined as the best response recorded from the start of the treatment until CR, PR or SD. CR: disappearance of all non-nodal target lesions and of all non-target lesions. In addition, any pathological lymph nodes assigned as target lesions/ non-target lesions must have a reduction in short axis to <10 mm. PR: at least a 30 percent (%) decrease in the sum of diameter of all target lesions, taking as reference the baseline sum of diameters. PD: at least a 20% increase in the sum of diameter of all measured target lesions, taking as reference the smallest sum of diameter of all target lesions recorded at or after baseline. In addition to the relative increase of 20%, the sum must also demonstrate an absolute increase of at least 5 mm^2. Unequivocal progression of existing non-target lesions. Appearance of new lesions.

OS was defined as the time from the start of treatment to the date of death due to any cause. If a participant was not known to have died, survival was censored at the date of last known date patient alive. Kaplan-Meier method was used for OS analysis.