Leonie Bruine de Bruin1, Ed Schuuring2, Geertruida H de Bock3, Lorian Slagter-Menkema1,2, Mirjam F Mastik2, Maartje G Noordhuis1, Johannes A Langendijk4, Philip M Kluin2, Bernard F A M van der Laan1. 1. Department of Otorhinolaryngology/Head and Neck Surgery, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. 2. Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. 3. Department of Epidemiology and Statistics, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands. 4. Department of Radiation Oncology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.
Abstract
OBJECTIVES: Most early stage laryngeal squamous cell carcinomas (LSCC) are treated with radiotherapy. Discovery of new biomarkers are needed to improve prediction of outcome after radiotherapy and to identify potential targets for systemic targeted therapy. The ataxia telangiectasia mutated (ATM) gene plays a critical role in DNA damage response induced by ionizing radiation. METHODS: The prognostic value of immunohistochemical expression of pATM, pChk2, and p53 were investigated in 141 patients with T1-T2 LSCC curatively treated with external beam radiotherapy. Uni- and multivariable Cox regression analyses were performed to examine the relation between expression levels of markers and local control. RESULTS: Local control was significantly worse in cases with high levels of pATM (HR 2.14; 95% CI, 1.08-4.24; P = .03). No significant associations with local control were found for pChk2 and p53 expression. The association of high pATM expression with poor local control was only found for supraglottic LSCC (HR 10.9; 95% CI, 1.40-84.4; P = .02). CONCLUSION: Our findings suggest a potential role for ATM in response to radiotherapy in early stage supraglottic LSCC and imply ATM inhibition as a possibility to improve response to radiotherapy. LEVEL OF EVIDENCE: NA Laryngoscope, 2020.
OBJECTIVES: Most early stage laryngeal squamous cell carcinomas (LSCC) are treated with radiotherapy. Discovery of new biomarkers are needed to improve prediction of outcome after radiotherapy and to identify potential targets for systemic targeted therapy. The ataxia telangiectasia mutated (ATM) gene plays a critical role in DNA damage response induced by ionizing radiation. METHODS: The prognostic value of immunohistochemical expression of pATM, pChk2, and p53 were investigated in 141 patients with T1-T2 LSCC curatively treated with external beam radiotherapy. Uni- and multivariable Cox regression analyses were performed to examine the relation between expression levels of markers and local control. RESULTS: Local control was significantly worse in cases with high levels of pATM (HR 2.14; 95% CI, 1.08-4.24; P = .03). No significant associations with local control were found for pChk2 and p53 expression. The association of high pATM expression with poor local control was only found for supraglottic LSCC (HR 10.9; 95% CI, 1.40-84.4; P = .02). CONCLUSION: Our findings suggest a potential role for ATM in response to radiotherapy in early stage supraglottic LSCC and imply ATM inhibition as a possibility to improve response to radiotherapy. LEVEL OF EVIDENCE: NA Laryngoscope, 2020.
Authors: Leonie Bruine de Bruin; Martijn J A M Clausen; Lorian Slagter-Menkema; Gertruida H de Bock; Johannes A Langendijk; Bert van der Vegt; Bernard F A M van der Laan; Ed Schuuring Journal: Laryngoscope Date: 2021-08-24 Impact factor: 2.970