The key thing to remember is that Mailer is a literary artist above all else that did, and since making words express those notions and impulses that don’t have coherent expression is what Mailer happened to excel at in his most inspired writing> It’s fair enough to loved language enough to abuse it in order interest to get his oft-script impressions across. But this is not a case where Mailer’s appropriation of the selected terms can be dimly understood by those reading him , a lot or just a little; he took pains through out his books to make clear what he meant by his use of the terms cancer, hip, existential and totalitarian. Mailer , of course,had odd ideas as to the cause and spread of disease and , in to paraphrase Joyce Carol Oats, was dangerous with some of his opinions because he expressed them so well, but I’d venture that “cancer” in particular was a metaphor he applied liberally to a social condition that set in on the collective spirit in of America during the Post War period. Strictly speaking,there’s something crackpot in how long he held on the to Reichean notion that bad faith causes the cells to go berserk, but I think, for Mailer, it was a rather good spring board to his fabulous metaphorical flights; the absurd notion that too much comfort and lack of risk taking increases our chances of become cancer ridden is fairly much forgotten as those bits of fevered lyricism take over your attention and manage to do what a great poem ought to, engage at the level of the line where it reveals the substance that’s under the assumption of accord our daily routines by and to realize that much of what we assume is fixed is subterfuge , socially constructed restrictions embedded in culture, institutions and even the language we use to critique our assumptions. This leads us to his use of the word “existential”, which , while lacking the systemic critique of the philosophical idealism that preceded its rise in a Europe ravaged by world wars, revolutions, and genocide , all the same coheres nicely with the notion that existence has no “meaning” independent of what one brings to their life span in terms of deeds performed in good faith, actions for which the active agent, the Hemingway hero, the Sartrean doubter, takes responsibility for. It’s a personalized brand of existentialism, and Mailer offers his adjustment to the term a number of times through his books, especially his essay collections.