515 CD47 expression is upregulated in solid tumors and correlates with phagocytic tumor-associated macrophage gene signature by Shiva Zaboli, Kelli Boyd, Nick van Buuren, Mengshu Xu, Azadeh Madjidi, Christina Moon, Iris Liu, Ruidong Li, Kai-Hui Sun, Abhishek Aggarwal, Jared Odegard