While the parent commenter did exaggerate, they are correct in their idea. You could subclassify cancers all the way down to individual gene mutations, and even

While the parent commenter did exaggerate, they are correct in their idea. You could subclassify cancers all the way down to individual gene mutations, and even then there is heterogeny within the cancer itself. Medicine tries to draw boundaries where different therapies help differently or where there is different pathophysiology going on. The article was able to draw one such additional boundary. Its relevance is yet to be confirmed with its phenotype or druggability.