SELP and neoplasm: Structural analysis of anti-tumor active indoles [16–18], bisindoles [19–21], and THPDTPI capable of targeting P-selectin and DNA [22–23] led to a hypothesis that the derivatives of 2,2’-(1,1’-methylenebis(1H-indole-3,1-diyl))diacetic acid, 2,2’- [(2,2’- methylene)bis(1H-indole-3,2-diyl)]diacetic acid, 2,2’- [(2,2’-(ethane-1,1-diyl)bis(1H-indole-3,2-diyl)]diacetic acid and 2,2’-[(2,2’-(propane-2,2-diyl)bis(1H-indole-3,2-diyl)]diacetic acid could target P-selectin and intercalate DNA, thereby could slow tumor growth and inhibit thrombosis.