I cannot create a summary of the requested article because the search results provided do not contain an article titled "STAT+: Vertex says its drug successfully reduced marker of kidney disease in late-stage trial". The search results contain information on the treatment of IgA nephropathy, including data on the drug Nefecon (budesonide) and other therapeutic approaches, but not on the specific Vertex drug mentioned in your request. In order to create an accurate and factual summary, I need access to the full text of the article you want to summarize.