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Article
Hearing Loss in Patients Who Received Cranial Radiation Therapy for Childhood Cancer
Journal of Clinical Oncology (2016)
  • Johnnie K. Bass, University of Memphis
  • Chia-Ho Hua, St Jude Children’s Research Hospital
  • Jie Huang, St Jude Children’s Research Hospital
  • Arzu Onar-Thomas, St Jude Children’s Research Hospital
  • Kirsten K. Ness, St Jude Children’s Research Hospital
  • Skye Jones, St Jude Children’s Research Hospital
  • Stephanie White, St Jude Children’s Research Hospital
  • Shaum P. Bhagat, University of Memphis
  • Kay W. Chang, Stanford University
  • Thomas E. Merchant, St Jude Children’s Research Hospital
Abstract
Purpose
Patients treated with cranial radiation therapy (RT) are at risk for sensorineural hearing loss (SNHL). Although SNHL is often characterized as a delayed consequence of anticancer therapy, longitudinal reports of SNHL in childhood cancer survivors treated with contemporary RT are limited. We report the incidence, onset, severity, and long-term trajectory of SNHL among children receiving RT. Potential risk factors for SNHL were also identified.

Patients and Methods
Serial audiologic testing was conducted on 235 pediatric patients who were treated with conformal or intensity-modulated RT as part of an institutional phase II trial for localized primary brain tumors, including craniopharyngioma, ependymoma, and juvenile pilocytic astrocytoma. All but one patient had measurable cochlear radiation dose (CRD) greater than 0 Gy. The median follow-up from RT initiation to latest audiogram was 9 years with a median of 11 post-RT audiograms per patient. Audiograms were classified by the Chang Ototoxicity Grading Scale. Progression was defined by an increase in Chang grade from SNHL onset to the most recent evaluation.

Results
At last evaluation, SNHL was prevalent in 14% of patients: 2.1% had mild and 11.9% had significant SNHL requiring hearing aids. Median time from RT to SNHL onset was 3.6 years (range, 0.4 to 13.2 years). Among 29 patients with follow-up evaluations after SNHL onset, 65.5% experienced continued decline in hearing sensitivity in either ear and 34.5% had no change. Younger age at RT initiation (hazard ratio [HR], 2.32; 95% CI, 1.21 to 4.46), higher CRD (HR, 1.07; 95% CI, 1.03 to 1.11), and cerebrospinal fluid shunting (HR, 2.02; 95% CI, 1.07 to 3.78) were associated with SNHL.

Conclusion
SNHL is a late effect of RT that likely worsens over time. Long-term audiologic follow-up for a minimum of 10 years post-RT is recommended.
Publication Date
April, 2016
DOI
10.1200/JCO.2015.63.6738
Citation Information
Johnnie K. Bass, Chia-Ho Hua, Jie Huang, Arzu Onar-Thomas, et al.. "Hearing Loss in Patients Who Received Cranial Radiation Therapy for Childhood Cancer" Journal of Clinical Oncology Vol. 34 Iss. 11 (2016) p. 1248 - 1255 ISSN: 1527-7755
Available at: http://works.bepress.com/shaum-bhagat/5/