title: Adverse reactions during imatinib and lansoprazole treatment in gastrointestinal stromal tumors.
abstract: OBJECTIVE
  To report the case of a patient affected by gastrointestinal stromal tumors (GIST) who developed cutaneous adverse drug reactions during treatment with imatinib and lansoprazole.
  
  
  METHODS
  After 2 months of treatment with imatinib 400 mg/day, a 60-year-old white female affected by GIST developed bilateral palpebral edema with hyperemic conjunctivae and labial edema when lansoprazole 15 mg/day was introduced to treat dyspeptic symptomatology. Treatment was discontinued, and on reintroduction of both drugs, the patient developed Stevens-Johnson syndrome. Two months later, generalized cutaneous reactions appeared immediately following reintroduction of low-dose imatinib with corticosteroid plus lansoprazole treatment. After discontinuation of all drugs, with the exception of the corticosteroid, the progression of cutaneous lesions stopped.
  
  
  CONCLUSIONS
  The use of imatinib is commonly associated with a high dose-dependent rate of rash and edema. Several cases of Stevens-Johnson syndrome have also been described, although not in patients affected by GIST. Severe skin reactions have been reported for lansoprazole including erythema multiforme, Stevens-Johnson syndrome, and toxic epidermal necrolysis. Applying Naranjo's algorithm, the adverse events were considered possible due to imatinib and probable due to lansoprazole.
  
  
  CONCLUSIONS
  On the basis of the data reported, we conclude that the adverse reactions described may be attributed to either drug alone. However, combined use of drugs may increase the risk of onset of these adverse reactions due to a potential drug interaction involving CYP3A4.
authors.affiliation: Section of Clinical Pharmacology, Department of Neurosciences, B.B. Brodie, University of Cagliari, Cagliari, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Severino
authors.forename: Caterina
authors.initials: C
authors.lastname: Chillotti
authors.forename: Roberto
authors.initials: R
authors.lastname: De Lisa
authors.forename: Maria
authors.initials: M
authors.lastname: Del Zompo
authors.forename: Raffaella
authors.initials: R
authors.lastname: Ardau
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000970:Antineoplastic Agents / Q000009:adverse effects*; D001549:Benzamides; D003875:Drug Eruptions / Q000209:etiology*; D004487:Edema / Q000139:chemically induced; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000188:drug therapy; D006801:Humans; D000068877:Imatinib Mesylate; D064747:Lansoprazole; D008875:Middle Aged; D009853:Omeprazole / Q000009:adverse effects* / Q000031:analogs & derivatives*; D010879:Piperazines / Q000009:adverse effects*; D054328:Proton Pump Inhibitors; D011743:Pyrimidines / Q000009:adverse effects*; D013262:Stevens-Johnson Syndrome / Q000139:chemically induced
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000970:Antineoplastic Agents; D001549:Benzamides; D010879:Piperazines; D054328:Proton Pump Inhibitors; D011743:Pyrimidines; D064747:Lansoprazole; D000068877:Imatinib Mesylate; D009853:Omeprazole