mri - guided adaptive radiotherapy for reducing xerostomia in head and neck cancer (martha-trial)

Conditions: Head and Neck Cancer; Xerostomia Due to Radiotherapy

Summary: radiotherapy is the main treatment for locally advanced squamous cell carcinoma of the head and neck (scchn). many advances regarding tumor control and patient survival have been made over the past decades. however, treatment-induced toxicity remains a crucial problem, leading to reduced quality of life and permanent impairment for many survivors. xerostomia is up to this day the leading cause of late toxicity for these patients. toxicity has been reduced by implementation of modern image guided radiotherapy (igrt) and intensity-modulated radiotherapy (imrt), but the low soft-tissue contrast of routine x-ray image guidance does not allow exact planning adaptation and daily imaging is associated with high radiation exposure. furthermore, despite the routinely use of imrt, rates of clinically relevant xerostomia (i.e. grade 2 or worse) are still common and reported in approximately 38%. recently developed hybrid machines (mridian®-ce approval since 2016), consisting of a linear accelerator and an integrated low-field mri, could allow a) better visualization of tumor and organs at risk, such as parotid glands during patient positioning and daily treatment, b) daily imaging without additional radiation exposure, c) narrowest established safety margins for the treatment volumes, and finally d) repetitive adaptation of target volumes according to changes in patient weight and tumor anatomy during the radiotherapy course. these procedures would facilitate a high-precision treatment and help reduce dose exposure of critical structures.


Eligibility criteria:
inclusion criteria: * histologically proven squamous cell carcinoma of the oral cavity oro- or hypopharynx or larynx, stages ii-ivb, requiring definitive or postoperative bilateral neck irradiation * age ≥ 18 years, no upper age limit * ecog-performance score \< 2 * the trial is open to both genders * history/physical examination within 30 days prior to registration by head and neck surgeon and radiation oncologist * fdg-pet-ct-scan within 30 days prior to registration exclusion criteria: * not adequately controlled hepatitis or hiv disease (hiv-viral load detectable) * second non-controlled malignancy other than basalioma or cervical/genital/anal in situ neoplasia during the last 2 years before enrollment * bilirubin \> 2,0 mg/dl, sgot, sgpt, ap, gamma-gt \>3x norm, gfr \< 30 ml/min * leucocytes \<3,5 x 10\^9/l or platelets \< 100 x 10\^9/l or neutrophiles \< 1,5 x 10\^9/l * other severe comorbidities or psychic disorders (e.g. myocardial infraction within 6 months prior to registration, permanent cardiac arrhythmia, copd gold iv, hepatitis b/c, schizophrenia, ongoing alcohol abuse etc.) * lactating and pregnant women * previous radiotherapy of the neck * contraindications for mri (e.g. pacemaker/icd, tattoos, cochlear or other not mr-compatible implants) * pre-existing salivary gland disease (e.g. sjorgen's-syndrome) or xerostomia-inducing medication (e.g. anticholinergic medication like tricyclic antidepressant) * claustrophobia