Eligibility Criteria:
Inclusion Criteria:
\- all female patients with signed informed consent who are starting with (neo-) adjuvant chemotherapy according to the following protocols:
* 4 x Epirubicin/Cyclophosphamid (EC) q3w, followed by 12 x Paclitaxel weekly or 12x Nab-Paclitaxel (+/- Trastuzumab)
* Paclitaxel or Nab-Paclitaxel weekly without anthracyclines
* Paclitaxel or Nab-Paclitaxel weekly in combination with Carboplatin
Exclusion criteria:
* patients without informed consent
* ECOG-Status \> 1
* age under 18 years
* previous chemotherapy
* therapy with SSNRI, SSRI, or tricyclic antidepressants especially duloxetine, gabapentine, pregabaline and amitryptiline.
* known polyneuropathy (e.g. alcoholic PNP, nephrogenic PNP, diabetic PNP etc.)
* Patients having diseases connected to PNP:
* Sjögren-syndrome, sarkoidosis, amyloidneuropathy, Morbus Fabry, HSAN (Hereditary Sensoric and Autonome Neuropathy)
* Guillain-Barré-syndrome, acute intermittent porphyria, critical-illness-PNP
* Vaskulitides, HNPP, diabetic amyotrophy, multifokal motoric neuropathy, Lewis-Sumner-syndrome, borreliosis-neuropathy, Zoster-neuritis, neuralgic shoulder amyotrophy
* Myelopathy, compression of the myelon, syringomyelia, meningomyelitis, Restless-Legs-syndrome
* Sulcus-Ulnaris-syndrome, Loge-de-Guyon-syndrome, Medianus-compression-syndrome, multiple sklerosis, AML, Lupus erythematodes, sklerodermia/systemic sclerosis, Ehlers-Danlos-syndrome, CREST-syndrome, Raynaud-syndrome, cold aglutinin disease, hämatologic neoplasms, diabetes mellitus, chronic alcohol abuse, hepatitis C, known severe kidney disease