Signal Transducer and Activator of Transcription (STAT) proteins have a fundamental role 
cell signaling, and are activated by a large number of cytokines and growth factors. One member of the STAT family, STAT3, has a critical role in oncogenesis. The present invention relates generally to disruption of the pathway of STAT3 signaling in the treatment of 
human cancer. STAT3 activation is shown to be present in diverse tumor 
cell lines and tumors, to promote oncogenesis, to inhibit 
apoptosis, and to reduce sensitivity to chemotherapeutic agents. Inhibition of STAT3 signaling induces 
apoptosis specifically in tumor 
cell lines, and increases sensitivity to chemotherapeutic agents. The invention relates more particularly to methods, compositions, means of administering such compositions, and means for identifying such compositions for the inhibition of STAT3 
intracellular signaling in the treatment of human cancers.