Inclusion criteria:  Patients assessed for pecan allergy, through oral food challenge, from January 2000 to december 2021, at the University Hospital of Montpellier Patients with a positive skin prick test and/or positive specific IgE to pecan nut  Exclusion criteria:  Patients not affiliated to French Social Security Patients not capable of understanding French Patients sensitized to pecan nut, who did not perform an oral food challenge to this food allergen