Methods and compositions are provided for diagnosing
lung cancer in a mammalian subject by use of three or more selected genes, e.g., a
gene expression profile, from the
peripheral blood mononuclear cells (PBMC) of the subject which is characteristic of
disease, a stage of the
disease, or enables prognosis of recurrence of
disease. The
gene expression profile includes three or more genes of Table I, Table II, Table III, Table IV, Table V, Table VI or Table VII herein. Detection of changes in expression in the selected genes forming the
gene expression profile from that of a
reference gene expression profile are correlated with non-
small cell lung cancer (NSCLC). One composition for use in such diagnosis includes three or more PCR primer-probe sets, wherein each primer-probe set amplifies a different
polynucleotide sequence from the
gene expression profile. Another composition for similar use contains a plurality of polynucleotides immobilized on a substrate, which probes hybridize to three or more
gene expression products from genes in the
gene expression profile. Still another composition involves detection of the
protein expression products of genes from the gene expression profile.