Abstract: The present invention concerns a pyrvinium compound or an analog thereof for the treatment of cancers. This compound inhibits Wnt activity in the cells of cancers such as adrenocortical, hepatocellular, hepatoblastoma, malignant melanoma, ovarian, Wilm's tumor, Barrett's esophageal, glioma, bladder, breast, gastric, head & neck, lung cell, mesothelioma, and cervical cancers. The present invention also provides a method for assaying for compounds that alter Wnt pathway activity. Also provided are methods for treating Wnt-related non-cancer disease states.