Antiproliferative activity of YPN-005 was measured in solid tumor cell lines with Myc amplification and in hematologic cancer cells with MCL-1overexpression….YPN-005 significantly inhibited the proliferation of TNBC, ER+ breast cancer, HCC, ovarian cancer, small cell lung cancer (SCLC), pancreas, prostate and various types of blood cancer cells and IC50's were determined in 1-20 nM range.