Abstract: Oligonucleotides capable of inhibiting the production of proliferation-associated proteins are provided. Oligonucleotides designed to be hybridizable with nucleic acids encoding nucleolar proteins are believed to be therapeutically useful. Certain of such oligonucleotides, hybridizable to portions of the gene coding for p120, especially the 3' untranslated region, were made and found to inhibit the synthesis of p120. The oligonucleotides of the invention are useful for the treatment of diseases characterized by hyperproliferation of cells such as malignancies, inflammatory and cardiovascular diseases. Treatment of human breast cell carcinoma, human epitheloid cervix carcinoma, human amelanotic melanoma, human renal cell carcinoma and other tumors are indicated.