Toniv,
They left off the legend to the synergism graph in their most recent presentation. If you look at a prior presentation (i.e. slide 27 from this Jan 2017 presentation) you will see that the colors represent different types of cancers and the shapes/symbols represent different cancer cell lines for each cancer type. Synergy is greater the closer to 0. As for the apples vs. oranges symbolism in slide 8 of the January 2019 preentation......the message is that newer generation pan-BET inhibitors like ZEN-3694 are far superior in so many ways compared to older, first generation pan-BET inhibitors.
BearDownAZ