“…NCDB HPV data are gathered from pathology reports (immunohistochemical staining) and molecular analyses that specify the HPV type identified. 22 From these initial reports, HPV status was categorized as positive for high-risk HPV types (types 16,18,26,31,33,35,36,45,51,52,53,56,58,59,66,67,68,69,70,73, 82, and 85), low-risk HPV types (types 6,11,32,34,40,42,44,54,61,62,64,71,72,74,81,83,84,87, and 89), and unknown HPV types (incomplete data); negative for HPV; or unknown. In the current study, patients were classified as having HPV-positive disease only if they tested positive for high-risk HPV types or were documented as having "high-risk types NOS [not otherwise specified]," and as having HPV-negative disease if they had a negative HPV test result.…”