Provided herein are methods of treating cancer in an individual in need thereof, the methods comprising administering to the individual a CXCR7 inhibitor. In some embodiments, additional therapeutic agents are used. Also provided herein are methods of preventing precancerous cells expressing FRS2β from developing into cancer, the method comprising administering to an individual having precancerous cells expressing FRS2β a CXCR7 inhibitor. In some embodiments, additional therapeutic agents are used.