the effects on auditory function of radiotherapy and chemotherapy treatments for head and neck tumours (earad)

Conditions: Head and Neck Neoplasms; Hearing Loss

Summary: radiotherapy and combined radiotherapy and chemotherapy are used to treat most tumours in the head and neck region. unfortunately, these treatments often result in hearing loss and tinnitus that has a negative impact on quality of life. this study will use a battery of sensitive tests, including measures of hair cell and neural function, before and after treatment, to measure the effects of these treatments on auditory function. the results will be compared with the individual radiotherapy dose characteristics, using state-of-the-art data mining technology, to identify the auditory substructures that are most sensitive to radiation with respect to the effects on auditory function. the data will provide the basis for new dose constraints to limit radiation doses to any identified substructures and to minimise loss in hearing ability for patients undergoing treatment for head and neck cancer.

the overall aim is to provide the data that will define radiotherapy dose constraints for individual substructures of the auditory pathway such that a better balance can be made between hearing loss and tumour control during radiotherapy for head and neck cancer. in particular the study aims to: 1. determine the impact of radiotherapy to the head and neck region on auditory function, including measures of hair cell and neural function 2. determine the interaction between radiation and cisplatin chemotherapy on auditory function 3. determine relations between different functional effects and radiation dose to substructures within the ear using advanced voxel-based data mining techniques 4. determine the auditory substructure that is most associated with speech-in-noise deficits 5. identify and validate a test which is most predictive of damage to that substructure, and could be the basis for future diagnosis 6. validate the importance of the localised sensitive substructure in an independent cohort

Eligibility criteria:
for prospective patient cohorts: inclusion criteria: * diagnosed with head and neck cancer * an mdt treatment decision of radiotherapy +/- cisplatin based chemotherapy exclusion criteria: * hearing loss greater than 25 db hl (average from 0.25 to 4 khz) prior to the study * existing hearing loss (self-reported- need for hearing aid) * an mdt treatment decision of carboplatin based chemotherapy * involved in another research project where the treatment is known to be ototoxic * unable to give informed consent for retrospective patient cohort: inclusion criteria: * previously diagnosed and treated for head and neck cancer * radiotherapy treatment to one side of the head * within 5 years post-treatment * an mdt treatment decision of radiotherapy +/- cisplatin based chemotherapy exclusion criteria: * an mdt treatment decision of carboplatin based chemotherapy * unable to give informed consent for retrospective normal-hearing controls: exclusion criteria: * hearing loss greater than 20 db hl (at any octave frequency from 0.25 to 4 khz) * unable to give informed consent for retrospective hearing-impaired controls: inclusion criteria: * hearing loss greater than 20 db hl (average from 0.25 to 4 khz) exclusion criteria: * unable to give informed consent

Keywords: radiotherapy