title: Survey of oxaliplatin-associated neurotoxicity using an interview-based questionnaire in patients with metastatic colorectal cancer.
abstract: BACKGROUND
  New chemotherapy regimens for patients with colorectal cancer have improved survival, but at the cost of clinical toxicity. Oxaliplatin, an agent used in first-line therapy for metastatic colorectal cancer, causes acute and chronic neurotoxicity. This study was performed to carefully assess the incidence, type and duration of oxaliplatin neurotoxicity.
  
  
  METHODS
  A detailed questionnaire was completed after each chemotherapy cycle for patients with metastatic colorectal cancer enrolled in a phase I trial of oxaliplatin and capecitabine. An oxaliplatin specific neurotoxicity scale was used to grade toxicity.
  
  
  RESULTS
  Eighty-six adult patients with colorectal cancer were evaluated. Acute neuropathy symptoms included voice changes, visual alterations, pharyngo-laryngeal dysesthesia (lack of awareness of breathing); peri-oral or oral numbness, pain and symptoms due to muscle contraction (spasm, cramps, tremors). When the worst neurotoxicity per patient was considered, grade 1/2/3/4 dysesthesias and paresthesias were seen in 71/12/5/0 and 66/20/7/1 percent of patients. By cycles 3, 6, 9, and 12, oxaliplatin dose reduction or discontinuation was needed in 2.7%, 20%, 37.5% and 62.5% of patients.
  
  
  CONCLUSIONS
  Oxaliplatin-associated acute neuropathy causes a variety of distressing, but transient, symptoms due to peripheral sensory and motor nerve hyperexcitability. Chronic neuropathy may be debilitating and often necessitates dose reductions or discontinuation of oxaliplatin. Patients should be warned of the possible spectrum of symptoms and re-assured about the transient nature of acute neurotoxicity. Ongoing studies are addressing the treatment and prophylaxis of oxaliplatin neurotoxicity.
authors.affiliation: Cancer Therapeutics Branch, Center for Cancer Research, National Cancer Institute, National Naval Medical Center, Bethesda, MD 20889-5105, USA. LeonardG@Sehb.ie
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Leonard
authors.forename: Maurice A
authors.initials: MA
authors.lastname: Wright
authors.forename: Mary G
authors.initials: MG
authors.lastname: Quinn
authors.forename: Suzanne
authors.initials: S
authors.lastname: Fioravanti
authors.forename: Nancy
authors.initials: N
authors.lastname: Harold
authors.forename: Barbara
authors.initials: B
authors.lastname: Schuler
authors.forename: Rebecca R
authors.initials: RR
authors.lastname: Thomas
authors.forename: Jean L
authors.initials: JL
authors.lastname: Grem
mesh_terms: D000328:Adult; D000368:Aged; D000964:Antimetabolites, Antineoplastic / Q000009:adverse effects / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000009:adverse effects / Q000494:pharmacology; D000069287:Capecitabine; D002986:Clinical Trials as Topic; D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000473:pathology; D003841:Deoxycytidine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000494:pharmacology; D005260:Female; D005472:Fluorouracil / Q000031:analogs & derivatives; D006801:Humans; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D020258:Neurotoxicity Syndromes / Q000473:pathology; D009944:Organoplatinum Compounds / Q000009:adverse effects* / Q000494:pharmacology*; D000077150:Oxaliplatin; D010292:Paresthesia / Q000139:chemically induced; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D000964:Antimetabolites, Antineoplastic; D000970:Antineoplastic Agents; D009944:Organoplatinum Compounds; D000077150:Oxaliplatin; D003841:Deoxycytidine; D000069287:Capecitabine; D005472:Fluorouracil