title: Elective versus therapeutic neck dissection in node-negative oral cancer: Evidence from five randomized controlled trials.
abstract: The aim of this study was to compare the outcomes of elective neck dissection (END) with that of a more conservative approach comprising of observation plus therapeutic neck dissection for nodal relapse (OBS), by conducting a meta-analysis of randomized controlled trials (RCTs) that compare these two surgical approaches in patients. RCTs conducted prior to May 2015 were identified from electronic databases such as MEDLINE EMBASE and Cochrane Library. Reference lists within the retrieved articles were used as secondary reference sources. Disease-free survival (DFS) and overall survival (OS) were the primary outcome measures. Five RCTs with a combined subject population of 779 patients were included. Meta-analysis of these 5 RCTs showed that DFS in END group was higher than that in the OBS group with a significant inter-group difference (Risk Ratio [RR]:1.33; 95% Confidence Interval [CI] 1.06, 1.66); P=0.01; five trials, 779 participants]. However, there was a significant statistical heterogeneity among the studies (I-squared=56%, P=0.06). Four studies had reported on OS. Meta-analysis of these 4 RCTs revealed a higher OS in the END group as compared to that that in the OBS group with a significant inter-group difference (RR: 1.18; 95% CI 1.07, 1.29); P=0.0009; four trials, 708 participants]. The statistical heterogeneity of these 4 studies is small (I-squared=14%, P=0.32). The results of this meta-analysis suggest that END at the time of resection of the primary tumor confers a DFS and OS benefit in patients with clinically node-negative oral cancer.
authors: Department of Oral and Maxillofacial & Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.
authors: Zhen-Hu
authors: ZH
authors: Ren
authors: Department of Respiratory Medicine, Shanghai Chest Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200030, China.
authors: Jian-Lin
authors: JL
authors: Xu
authors: Department of Stomatology, Affiliated Hospital of Guilin Medical University, Guilin 541001, Guangxi Province, China.
authors: Bo
authors: B
authors: Li
authors: Department of Oral and Maxillofacial Surgery, Hospital of Stomatology Wuhan University, Wuhan 430079, Hubei Province, China.
authors: Teng-Fei
authors: TF
authors: Fan
authors: Department of Oral and Maxillofacial & Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China. Electronic address: jitong70@hotmail.com.
authors: Tong
authors: T
authors: Ji
authors: Department of Oral and Maxillofacial & Head and Neck Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China. Electronic address: zhangcp9th@hotmail.com.
authors: Chen-Ping
authors: CP
authors: Zhang
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000517:prevention & control / Q000601:surgery*; D017558:Elective Surgical Procedures / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000601:surgery*; D037981:Neck Dissection / Q000379:methods*; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control*; D016032:Randomized Controlled Trials as Topic
keywords: Elective neck dissection; Meta-analysis; Observation; Randomized controlled trial; Therapeutic neck dissection