Abstract: The present invention relates to methods for treating a dalotuzumab responsive cancer, in a patient, comprising determining the expression level of liver kinase B1 (LKB1), in a cancer cell from the patient, and when said expression is determined to be lower than that of a control cell; administering, to said patient, a therapeutically effective amount of dalotuzumab. The invention also relates to methods for assessing neoplastic cells, selecting patients, selecting therapies as well as diagnostic methods.

Abstract: Disclosed herein are methods of stratifying a patient population into an IGF-1R inhibitor responder or resistant population comprising assaying a sample of cells derived from a patient to determine if a cell from the patient sample is sensitive to treatment with an IGF-1R inhibitor and selecting a patient for treatment with an IGF-1R inhibitor if the cells from the patient are determined to be sensitive. The determination is based upon either the expression levels of wild type LKB1 in the patient sample wherein a low level of expression of the protein or the gene encoding the biomarker protein is predictive of a favorable outcome to an IGF-1R targeted therapy or detecting the presence of a loss of function mutant LKB1 in the sample, wherein presence of the mutant is predictive of a favorable outcome.