Single and Combined Modality Trans-Oral Robotic Surgery in Early Oropharyngeal Cancer

Inclusion Criteria: * 18 years and older. * Primary tumour within the oropharynx (defined as tonsil, soft palate, tongue base, lateral and posterior oropharyngeal walls) * Histologically confirmed squamous cell carcinoma. * P16 positive or negative tumours * Index cancer treated with TORS with or without adjuvant therapy. * Early pT1-T2 stage oropharyngeal SCC * TORS performed on or before 31st December 2021 For the exploratory analysis only: * Ability to consent to molecular analysis study * Ability to consent to radiomic/ imaging study (as required for international centres) Exclusion Criteria: * Moderate to advanced stage T3-T4 oropharyngeal SCC * TORS performed for diagnostic, recurrent, or palliative intentions. * Prior history of head and neck cancer or radiation therapy at any time * Known distant metastatic disease. * Nasopharyngeal, thyroid, cutaneous, and non-SCC head and neck cancers.