The present invention provides methods for detecting and diagnosing cancer, such methods involving the determination of the expression level of the RQCD1, GIGYF1 or GIGYF2 genes. These genes were discovered to discriminate cancer cells from normal cells. Furthermore, the present invention provides methods of screening for therapeutic agents useful in the treatment of cancer and methods for treating cancer. Moreover, the present invention provides siRNAs targeting the RQCD1, GIGYF1 and/or GIGYF2 genes, all of which are suggested to be useful in the treatment of cancer.
