Compositions and methods for treating cancer

1. A method of treating breast cancer with an mTOR inhibitor and an anti-IGF-1R antibody, wherein the mTOR inhibitor is ridaforolimus and the anti-IGF-1R antibody comprises a light chain comprising the amino acid sequence SEQ ID NO: 8 and a heavy chain comprising the amino acid sequence of SEQ ID NO: 10, wherein the ridaforolimus is orally administered at a dose of 10 mg or 20 mg per day five days a week and the antibody is administered intravenously at a dose of 10 mg/kg either once a week or once every other week.