In co-cultures of human mesenchymal stem cells with human MDA-MB-231 breast cancer or Hep G2 cell liver cancer cells, the aptamer blocked extracellular Adam8 activities with associated reversal of the previously established cancer-derived osteopontin-induced myofibroblast cancer-associated fibroblast phenotype (myCAF). The gene discussed is ADAM8; the disease is breast carcinoma.