Oncological outcome of contralateral submental artery island flap versus primary closure in tongue squamous cell carcinoma: randomized non-inferiority clinical trial

• Published in: International journal of oral and maxillofacial surgery 2023-02, Vol.52 (2), p.152-160
• Main Authors: Jamali, O.M., Shindy, M.I., Noman, S.A., Beheiri, M.G., Amin, A.A.
• Format: Article
• Language: English
• Subjects: Arteries; Carcinoma, Squamous Cell - pathology; Carcinoma, Squamous Cell - surgery; Humans; Oncologic safety; Primary closure; Submental flap; Surgical Flaps - blood supply; Tongue; Tongue - surgery; Tongue Neoplasms - surgery; Tongue reconstruction; Treatment Outcome
• ISSN: 0901-5027; 1399-0020
• DOI: 10.1016/j.ijom.2022.05.002

The aim of this study was to test the non-inferiority of the contralateral submental island flap (CSIF) compared with primary closure (PC) regarding local recurrence after partial glossectomy in patients with oral tongue squamous cell carcinoma (OTSCC). This open-label, non-inferiority randomized controlled trial enrolled patients with cT1–2 lateralized OTSCC. The primary outcome was local recurrence by 12 months postoperative. Non-inferiority would be declared if the upper limit of the two-sided 95% confidence interval (CI) for the proportion difference in local recurrence between the two groups did not exceed a non-inferiority margin of 15.0%. The functional outcome was assessed for superiority through secondary outcomes. In the intention-to-treat analysis, the local recurrence rate was 3.1% (1/32) in the CSIF group versus 9.4% (3/32) in the PC group; the proportion difference was − 6.3% (95% CI −18.0% to 5.5%). In the per-protocol analysis, the local recurrence rate was 3.1% (1/32) versus 3.3% (1/30); the proportion difference was − 0.2% (95% CI −9% to 8.6%). Speech was significantly superior in the CSIF group (P = 0.001). In conclusion, the CSIF was found to be non-inferior to PC regarding local recurrence at 1 year. A limitation of this study is the relatively large non-inferiority margin and consequently relatively small sample size. Further studies with a smaller non-inferiority margin and therefore larger sample size are needed to validate these findings.