Although the polycomb group protein Enhancer of Zeste Homolog 2 (EZH2) is well recognized for its role as a key regulator of cell differentiation, its involvement in tissue regeneration is largely unknown. Here we show that EZH2 is up-regulated following cerulein-induced pancreatic injury and is required for tissue repair by promoting the regenerative proliferation of progenitor cells. Loss of EZH2 results in impaired pancreatic regeneration and accelerates KRas^G12D-driven neoplasia. Our findings implicate EZH2 in constraining neoplastic progression through homeostatic mechanisms that control pancreatic regeneration and provide insights into the documented link between chronic pancreatic injury and an increased risk for pancreatic cancer.

Introduction: Histopathologic assessment of surgical specimens imparts crucial information that is essential for diagnosis, treatment planning and prognostication for patients with Oropharyngeal Squamous Cell Carcinoma (OPSCC). This review explores the range of diagnostic techniques utilized to assess the HPV (Human Papilloma Virus) status in OPSCC. It covers both traditional methods—such as p16 immunohistochemistry, HPV in situ hybridization, and DNA polymerase chain reaction (PCR)—and newer, evolving strategies including circulating HPV tumor DNA analysis and oral HPV DNA/mRNA PCR testing. Discussion: There are currently several histopathologic techniques for the diagnosis of HPV-associated OPSCC. This complexity of care has led to guidelines from numerous authorities (NCCN, ASCO, CAP), which this paper discusses and summarizes for head and neck oncology specialists. Conclusion: The ability to detect HPV in HPV-associated OPSCC is imperative for diagnosis, prognostication, staging, and management of the disease. Advances including liquid biopsy (TTMV-HPV DNA) may be utilized as an adjunct to diagnosis, treatment, and cancer surveillance in the future.

American Joint Committee on Cancer 8 th edition staging—an improvement in prognostication in HPV-associated oropharyngeal cancer?