The assessment of neuropathy was performed using a questionnaire, by neurological tests, and by vibration threshold (VT) measurements. Because VT determination gives the most objective information, VT measurements were used for further analyses.
The aims of the current explorative study were to assess persistent neuropathy in 45 patients up to 6 years after treatment with cisplatin or oxaliplatin and to determine the most adequate method to evaluate neuropathy. Furthermore, the effect of possible determinants on persistent neuropathy was investigated.
The analyses revealed that neuropathy of the hands was related to follow-up time, with an observed recovery half-life of 6.8 (+/- 3.1) years. No significant reversibility of neuropathy of the feet within the observation period could be demonstrated. For cisplatin, the severity of neuropathy was related to the cumulative dose and sodium thiosulfate use. Oxaliplatin induced neuropathy did not appear to be related to the dose within the studied dose range. No relationship with platinum levels, renal function, glutathione transferase genotypes, diabetes mellitus, alcohol use, or co-medication could be demonstrated. This study was performed as an explorative study and the issues discussed need to be investigated further.
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