Primary outcome parameter:
compound score of standardized neuropsychological test
Secondary parameters:
* olfactory function (Sniffin Sticks)
* total neuropathy score (TNS), reduced version (clinical examination, neurography of sural and peroneal nerve)
* cytokine profiling from serum samples (ELISA)
* quality of life (questionnaire)
* depression screening (questionnaire)
* symptoms of polyneuropathy (questionnaire)
* symptoms of cognitive impairment (everyday memory test questionnaire)
Assessment time points:
* baseline (after surgical tumor resection and before chemotherapy)
* follow up 1 (3 weeks after last chemotherapy cycle or 21 weeks (control patients))
* follow up 2 (optional; 1 year after chemotherapy completion)
