Chemoradiotherapy, Adjuvant Humans 2 adjuvant chemoradiotherapy 2 chemoradiotherapy 2 comparative study 2 human 2 overall survival 2 Adenocarcinoma 1 Adjuvant chemoradiation 1 Adjuvant radiation 1 Aged 1 Article 1 Chemoradiotherapy 1 Female 1 Follow-Up Studies 1 HPV 1 Human papillomavirus 1 Lymphatic Metastasis 1 Male 1 Middle Aged 1 Neck Dissection 1 Neoadjuvant Therapy 1 Note 1 Oropharyngeal Neoplasms 1 Oropharyngeal cancer 1 Pancreatic Neoplasms 1 Papillomaviridae 1 Papillomavirus Infections 1 Pathologic risk factors 1 Pharyngectomy 1