Antitumor Effects of Tryptanthrin on Colorectal Cancer by Regulating the Mitogen-Activated Protein Kinase Signaling Pathway and Targeting Topo I and IDO1 - Simeng Lu; Bao-Long Hou; Ting Wang; Keyu Ma; Anli Huang; Xue Wu; Yan-Ni Liang; Zheng Wang (ACS Omega)