Clinical and Genome-wide Analysis of Cisplatin-induced Tinnitus Implicates Novel Ototoxic Mechanisms.
El Charif, O
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Purpose Cisplatin, a commonly used chemotherapeutic, results in tinnitus, the phantom perception of sound. Our purpose was to identify the clinical and genetic determinants of tinnitus among testicular cancer survivors (TCS) following cisplatin-based chemotherapy.Experimental design TCS ( n = 762) were dichotomized to cases (moderate/severe tinnitus; n = 154) and controls (none; n = 608). Logistic regression was used to evaluate associations with comorbidities and SNP dosages in genome-wide association study (GWAS) following quality control and imputation (covariates: age, noise exposure, cisplatin dose, genetic principal components). Pathway over-representation tests and functional studies in mouse auditory cells were performed.Results Cisplatin-induced tinnitus (CisIT) significantly associated with age at diagnosis ( P = 0.007) and cumulative cisplatin dose ( P = 0.007). CisIT prevalence was not significantly greater in 400 mg/m 2 -treated TCS compared with 300 ( P = 0.41), but doses >400 mg/m 2 (median 580, range 402-828) increased risk by 2.61-fold ( P < 0.0001). CisIT cases had worse hearing at each frequency (0.25-12 kHz, P < 0.0001), and reported more vertigo (OR = 6.47; P < 0.0001) and problems hearing in a crowd (OR = 8.22; P < 0.0001) than controls. Cases reported poorer health ( P < 0.0001) and greater psychotropic medication use (OR = 2.4; P = 0.003). GWAS suggested a variant near OTOS (rs7606353, P = 2 × 10 -6 ) and OTOS eQTLs were significantly enriched independently of that SNP ( P = 0.018). OTOS overexpression in HEI-OC1, a mouse auditory cell line, resulted in resistance to cisplatin-induced cytotoxicity. Pathway analysis implicated potassium ion transport (q = 0.007).Conclusions CisIT associated with several neuro-otological symptoms, increased use of psychotropic medication, and poorer health. OTOS , expressed in the cochlear lateral wall, was implicated as protective. Future studies should investigate otoprotective targets in supporting cochlear cells.
Cell Line, Tumor
Genetic Predisposition to Disease
Polymorphism, Single Nucleotide
Genome-Wide Association Study
Clinical Academic Radiotherapy (Huddart)
License start date
Clinical cancer research : an official journal of the American Association for Cancer Research, 2019, 25 (13), pp. 4104 - 4116