This invention relates to compounds, compositions, and methods useful for modulating GRB2 associated binding protein (GAB2) gene expression using short interfering nucleic acid (siNA) molecules. This invention also relates to compounds, compositions, and methods useful for modulating the expression and activity of other genes involved in pathways of GRB2 associated binding protein (GAB2) gene expression and/or activity by RNA interference (RNAi) using small nucleic acid molecules. In particular, the instant invention features small nucleic acid molecules, such as short interfering nucleic acid (siNA), short interfering RNA (siRNA), double-stranded RNA (dsRNA), micro-RNA (miRNA), and short hairpin RNA (shRNA) molecules and methods used to modulate the expression of GAB2 genes. The small nucleic acid molecules are useful in the treatment of cancer, malignant blood disease (leukemia), inflammatory diseases or conditions, allergic diseases or conditions, or proliferative diseases or conditions.