  Several philosophers have weighed in on the matter of the nature of disease and disease classification (see, e.g., Ereshefsky, et al. 2015; Lange 2007; Broadbent 2009 and 2015; Williams 2011; Khalidi 2013; Sorenson 2011). The questions these authors are addressing are both epistemic—what warrants choice of criteria of classification of disease—and metaphysical—given diseases like cancer lack “essential” properties, is it correct to think of disease “kinds” as “natural”?