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Table S1: Crystallographic data collection and refinement statistics Table S2: Inhibitory activity against other BET bromodomains Table S3: Bromodomain profiling data Fig. S1: Detailed binding interactions of compounds 1 - 5 in BRD4-1 Fig. S2: Comparison of compound 2 and JQ1 in Brd4-1 Fig. S3: Chemical structures of other compounds used in this work. Fig. S4: Statistical evaluation of kinome profiling data using the Gini coefficient Fig. S5: Original flow cytometry data of MM1.S cells Fig. S6: MM1.S cells require stimulation with IL-6 to detect phospho-STAT3 levels Fig. S7: Effect of dual BRD4-kinase inhibitors on MV-4-11 cells. Fig. S8: Time dependent alteration of c-Myc and p21Cip1 levels in MM1.S cells. Fig. S9: Effect of dual BET-kinase inhibitors on ruxolitinib sensitive MPN cell lines Fig. S10: Dose-effect analysis of UKE-1 cells treated with drug combinations Fig. S11: Cell line sensitivity by tissue type

Synergistic action of kinase and BET bromodomain inhibitors in cell killing has been reported for a variety of cancers. Using the chemical scaffold of the JAK2 inhibitor TG101348, we developed and characterized single agents which potently and simultaneously inhibit BRD4 and a specific set of oncogenic tyrosine kinases including JAK2, FLT3, RET, and ROS1. Lead compounds showed on-target inhibition in several blood cancer cell lines and were highly efficacious at inhibiting the growth of hematopoietic progenitor cells from patients with myeloproliferative neoplasm. Screening across 931 cancer cell lines revealed differential growth inhibitory potential with highest activity against bone and blood cancers and greatly enhanced activity over the single BET inhibitor JQ1. Gene drug sensitivity analyses and drug combination studies indicate synergism of BRD4 and kinase inhibition as a plausible reason for the superior potency in cell killing. Combined, our findings indicate promising potential of these agents as novel chemical probes and cancer therapeutics. Mol Cancer Ther; 16(6); 1054–67. ©2017 AACR.

Table S4: Kinome profiling data (Microsoft Excel sheet) Table S5: Cell line screening data (Microsoft Excel sheet)