Study	Reason for exclusion
Abdurehim 2009	Study abandoned due to difficulty recruiting patients
Hintz 1979	ALLOCATION: Random, concealed, not stratified by site PARTICIPANTS: Patients diagnosed with squamous carcinoma of any head and neck site between 1971 and 1976. Only 24 patients had early glottic cancer; 7 T2 cancers allocated radiotherapy and one allocated surgery INTERVENTIONS: Radiotherapy and surgery. Radiotherapy regimen may be sub‐optimal OUTCOME MEASURES: Local control rates, voice function. Analysis not on an intention‐to‐treat basis
Li 1993	ALLOCATION: Stratified randomisation, concealment unclear PARTICIPANTS: Patients diagnosed with laryngeal cancer (all histological and clinical types and stage). Only 25 patients had early glottic cancer INTERVENTIONS: Preoperative radiotherapy and surgery compared with surgery alone. 14 patients with early glottic laryngeal cancer randomised to surgery alone OUTCOME MEASURES: 3‐ and 5‐year survival; postoperative infection rate
Yin 2000	(Information derived from conference proceedings abstract only) ALLOCATION: Following surgery, method unclear, concealment unclear PARTICIPANTS: 92 patients; stage unclear INTERVENTIONS: Surgery and postoperative radiotherapy compared with surgery alone OUTCOME MEASURES: 3‐ and 5‐year survival