Navigating Cancer, a Seattle startup that makes software to help providers and patients manage cancer treatment, landed $26 million in a Series D investment round. The funding was led by Merck Global Health Innovation Fund and TT Capital Partners. The American Cancer Society’s BrightEdge philanthropic venture fund also participated, along with LabCorp, Orix Capital Growth and Rustic Canyon Partners. The startup’s total funding to date now stands at $44 million. The $26 million figure includes $12 million that GeekWire previously reported about in April.