Inclusion Criteria:  Studies including MEN-1 patients who underwent a routine thymectomy during parathyoidectomy  We accepted randomized controlled trials or observational studies that included patients of any age who underwent a routine TCT in the setting for MEN-1, published as full-length articles in peer-reviewed journals, which mentioned data on thymic carcinoid tumours.  Exclusion Criteria:  We excluded reviews, letters, conference proceedings and non-English publications.