Christina Hague1, William Beasley2, Kate Garcez1, Lip W Lee1, Andrew McPartlin1, Alan McWilliam2,3, David Ryder4, Andrew J Sykes1, David Thomson1, Marcel van Herk2,3, Catharine West5, Nick J Slevin1. 1. a Department of Head and Neck Clinical Oncology , The Christie NHS Foundation Trust , Manchester , UK. 2. b Division of Cancer Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Heath , University of Manchester, Manchester Academic Health Science Centre , Manchester , UK. 3. c Department of Radiotherapy Related Research , The Christie NHS Foundation Trust , Manchester , UK. 4. d Statistics Unit , The Christie NHS Foundation Trust , Manchester , UK. 5. e Translational Radiobiology Group, Division of Cancer Sciences , Manchester Academic Health Science Centre, University of Manchester, The Christie NHS Foundation Trust , Manchester , UK.
Abstract
AIMS: This feasibility study aimed to identify relationships between radiation doses to the masticatory apparatus as a combined block or as individual subunits with changes in trismus following radiotherapy. MATERIAL AND METHODS:Twenty patients from a single center were recruited prospectively as part of a randomized trial comparing proactive exercises in the management of trismus. Patients with stage III/IV oral cavity or oropharyngeal squamous cell cancers received intensity-modulated radiotherapy with concurrent systemic therapy. All patients had trismus prior to radiotherapy. Maximal inter-incisor distance (MID) was measured pre- and 6 months from the start of radiotherapy. Bilateral muscles of mastication: medial and lateral pterygoids (MP and LP), masseters (M), temporalis (T), temporomandibular joint (TMJ) were contoured on CT images. The block comprised all muscles excluding the TMJ below the orbital floor. Mean dose, equivalent uniform dose (EUD) and V35-V60 Gy were compared with change in MID. RESULTS: In six patients, the MID deteriorated at 6 months from the start of radiotherapy compared with 14 whose MID improved. No significant association was observed between age, gender, smoking, alcohol status, exercise compliance, cisplatin, tumor site, stage, V35-V60 Gy or EUD with change in MID. A clinical outlier was excluded. Without the outlier (n = 19), a significant association was seen between mean dose and change in MID at 6 months for the ipsilateral block (p = .01), LP (p = .04) and M (p < .01). All patients where trismus deteriorated at 6 months received mean doses >40 Gy to the block. CONCLUSION: Higher mean radiation doses to the ipsilateral block, LP and M were significantly associated with deterioration in trismus. Limiting dose to these structures to ≤40 Gy for tumors not invading the masticatory muscles may improve treatment-related sequelae. The ipsilateral block, LP and M should be studied further as possible alternative avoidance structures in radiotherapy treatment planning.
RCT Entities:
AIMS: This feasibility study aimed to identify relationships between radiation doses to the masticatory apparatus as a combined block or as individual subunits with changes in trismus following radiotherapy. MATERIAL AND METHODS: Twenty patients from a single center were recruited prospectively as part of a randomized trial comparing proactive exercises in the management of trismus. Patients with stage III/IV oral cavity or oropharyngeal squamous cell cancers received intensity-modulated radiotherapy with concurrent systemic therapy. All patients had trismus prior to radiotherapy. Maximal inter-incisor distance (MID) was measured pre- and 6 months from the start of radiotherapy. Bilateral muscles of mastication: medial and lateral pterygoids (MP and LP), masseters (M), temporalis (T), temporomandibular joint (TMJ) were contoured on CT images. The block comprised all muscles excluding the TMJ below the orbital floor. Mean dose, equivalent uniform dose (EUD) and V35-V60 Gy were compared with change in MID. RESULTS: In six patients, the MID deteriorated at 6 months from the start of radiotherapy compared with 14 whose MID improved. No significant association was observed between age, gender, smoking, alcohol status, exercise compliance, cisplatin, tumor site, stage, V35-V60 Gy or EUD with change in MID. A clinical outlier was excluded. Without the outlier (n = 19), a significant association was seen between mean dose and change in MID at 6 months for the ipsilateral block (p = .01), LP (p = .04) and M (p < .01). All patients where trismus deteriorated at 6 months received mean doses >40 Gy to the block. CONCLUSION: Higher mean radiation doses to the ipsilateral block, LP and M were significantly associated with deterioration in trismus. Limiting dose to these structures to ≤40 Gy for tumors not invading the masticatory muscles may improve treatment-related sequelae. The ipsilateral block, LP and M should be studied further as possible alternative avoidance structures in radiotherapy treatment planning.
Authors: Laura W J Baijens; Margaret Walshe; Leena-Maija Aaltonen; Christoph Arens; Reinie Cordier; Patrick Cras; Lise Crevier-Buchman; Chris Curtis; Wojciech Golusinski; Roganie Govender; Jesper Grau Eriksen; Kevin Hansen; Kate Heathcote; Markus M Hess; Sefik Hosal; Jens Peter Klussmann; C René Leemans; Denise MacCarthy; Beatrice Manduchi; Jean-Paul Marie; Reza Nouraei; Claire Parkes; Christina Pflug; Walmari Pilz; Julie Regan; Nathalie Rommel; Antonio Schindler; Annemie M W J Schols; Renee Speyer; Giovanni Succo; Irene Wessel; Anna C H Willemsen; Taner Yilmaz; Pere Clavé Journal: Eur Arch Otorhinolaryngol Date: 2020-12-19 Impact factor: 2.503
Authors: Sara C Parke; David Michael Langelier; Jessica Tse Cheng; Cristina Kline-Quiroz; Michael Dean Stubblefield Journal: Curr Oncol Rep Date: 2022-02-19 Impact factor: 5.075