NDUFB6 and endometrial cancer: Further, one of the endometrial cancer studies investigating mitochondrial DNA mutations conducted an immunohistochemistry analysis of various types of type 1 endometrial cancer samples by staining for nuclear-coded NDUFB6 and mitochondria-coded MTND6. In a 0–4 intensity score for staining, samples with oncocytic-like foci showed about 23% (3/13) complete loss of staining, 23% (3/13) partial loss of staining with an intensity score of 2 and 23% (3/13) partial loss of staining with the intensity score of 3 for NDUFB6 (28).