A Study of Erlotinib (Tarceva) in Participants With Non-Small Cell Lung Cancer (NSCLC) (MERIT)

Affymetrix gene expression profiles were primarily analyzed to identify differentially expressed genes between the participants who derived clinical benefit status and those who did not. Analysis was performed using a multivariate linear model (with clinical benefit status, histology, ethnicity, sex, RNA integrity number (RIN), smoking status and stage as predictors), and a False Discovery Rate criteria of below 0.3 as cut-off. Clinical benefit is defined in the Outcome Measure 5.

Affymetrix gene expression profiles were primarily analyzed to identify differentially expressed genes between the participants who derived clinical benefit status and those who did not. Analysis was performed using a multivariate linear model (with clinical benefit status, histology, ethnicity, sex, RNA integrity number (RIN), smoking status and stage as predictors), and a False Discovery Rate criteria of below 0.3 as cut-off. Number of participants with EGFR mutation (L858R/ exon 19 deletion) and who achieved clinical benefit status was reported. Clinical benefit is defined in the Outcome Measure 5.

Affymetrix gene expression profiles were primarily analyzed to identify differentially expressed genes between the participants who derived clinical benefit status and those who did not. Analysis was performed using a multivariate linear model (with clinical benefit status, histology, ethnicity, sex, RNA integrity number (RIN), smoking status and stage as predictors), and a False Discovery Rate criteria of below 0.3 as cut-off. Number of participants with KRAS gene mutation and who achieved clinical benefit status was reported. Clinical benefit is defined in the Outcome Measure 5.

Tumor response was defined as either a CR or a PR prior to failure (disease progression, death from any cause, or a second malignancy). CR was defined as the complete disappearance on magnetic response imaging of all enhancing tumor and mass effect on a stable or decreasing dose of dexamethasone (or only receiving adrenal replacement doses) accompanied by a stable or improving neurologic examination that was maintained for at least 12 weeks. PR was defined as a greater than or equal to 50 percent (%) reduction in tumor size by bi-dimensional measurement on a stable or decreasing dose of dexamethasone accompanied by a stable or improving neurologic examination that was maintained for at least 12 weeks.

Clinical benefit was defined as either a CR, PR, or SD prior to failure (disease progression, death from any cause, or a second malignancy). CR: complete disappearance on magnetic response imaging of all enhancing tumor and mass effect on a stable or decreasing dose of dexamethasone (or only receiving adrenal replacement doses) accompanied by a stable or improving neurologic examination that was maintained for at least 12 weeks. PR: greater than or equal to 50% reduction in tumor size by bi-dimensional measurement on a stable or decreasing dose of dexamethasone accompanied by a stable or improving neurologic examination that was maintained for at least 12 weeks. SD: neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD) taking as reference smallest sum of longest dimensions since treatment started associated to non-progressive disease response for non-target lesions. PD: unequivocal progression of existing non-target lesions.