Disclosed herein are primers and probes for the detection of single nucleotide polymorphisms (SNPs) in the KRAS gene. These primers and probes may be used in a method of identifying the presence or absence of one or more SNPs in the KRAS gene. These primers and probes may also be used in a method of predicting a response of a subject in need thereof to a cancer therapy. The primers and probes may further be used in a method of selecting a cancer therapy for a subject in need thereof.