COL18A1 and posterior cortical atrophy: The importance of STAT3 as a central signaling node in PCa downstream of bFGF and VEGF is further underscored by recent work showing that delivery of endostatin, a non-specific inhibitor of FGF and VEGF angiogenesis and STAT3 siRNA using an attenuated Salmonella vector inhibited PCa xenograft growth in vivo [86].