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Contact Dermatitis Due to Nickel Allergy in Patients Suffering from Non-Celiac Wheat Sensitivity.

Nutrients 2017 Februrary 3
BACKGROUND:  Non-celiac wheat sensitivity (NCWS) is a new clinical entity in the world of  gluten-related diseases. Nickel, the most frequent cause of contact allergy, can be found in wheat  and results in systemic nickel allergy syndrome and mimics irritable bowel syndrome (IBS).  Objective: To evaluate the frequency of contact dermatitis due to nickel allergy in NCWS patients  diagnosed by a double-blind placebo-controlled(DBPC)challenge,and to identify  the  characteristics  of  NCWS  patients  with  nickel  allergy.  Methods: We performed  a prospective study  of 60 patients (54 females, 6 males; mean age 34.1 ± 8.1 years) diagnosed with NCWS from  December  2014 to November 2016; 80 age- and sex-matched subjects with functional gastrointestina l symptoms served as controls. Patients reporting contact dermatitis related to nickel-containing objects  underwent  nickel  patch  test  (Clinicaltrials.gov  registration number: NCT02750735).

RESULTS:   Six  out  of  sixty  patients  (10%)  with  NCWS  suffered  from contact dermatitis and  nickel allergy  and  this  frequency  was  statistically  higher (p = 0.04)than observed in the control group(5%. The main clinical characteristic of  NCWS  patients with nickel allergy was a  higher frequency  of  cutaneous  symptoms  after  wheat ingestion compared to NCWS patients who did not suffer  from  nickel  allergy  (p < 0.0001.

CONCLUSIONS:  Contact dermatitis and nickel allergy  are more  frequent  in  NCWS  patients than  in  subjects  with  functional gastrointestinal disorders;furthermore, these patients had a very high frequency of cutaneous manifestations after wheat  ingestion.  Nickel  allergy  should  be  evaluated  in  NCWS  patients  who  have  cutaneous  manifestations after wheat ingestion.

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