Gonadectomy in conditions affecting sex development: A registry-based cohort study

Objectives: To determine trends in clinical practice for individuals with D SD requiring gonadectomy. Design: Retrospective cohort study. Methods: Information regarding age at gonadectomy according to diagnosis ; reported sex; time of presentation to specialist centre; and location of centre from cases reported t o the International DSD Registry and who were over 16 years old in January 2019. Results: Data regarding gonadectomy were available in 668 (88%) individu als from 44 centres. Of these, 248 (37%) (median age (range) 24 (17, 75) years) were male and 420 (63%) (median age (range) 26 (16, 86) years) were female. Gonadectomy was reported from 36 centres in 351/668 cas es (53%). Females were more likely to undergo gonadectomy (n = 311, P < 0.0001). The indication for gonadectomy was reported in 268 (7 6%). The most common indication was mitigation of tumour risk in 172 (64%). Variatio ns in the practice of gonadectomy were observed; of the 351 cases from 36 centres, 17 (5%) at 9 centres had undergo ne gonadectomy before their first presentation to the specialist centre. Median age at gonadectomy of cases from high -income countries and low-/middle-income countries (LMIC) was 13.0 years (0.1, 68) years and 16.5 years (1, 28), r espectively (P < 0.0001) with the likelihood of long-term retention of gonads being higher in LMIC countries. Conclusions: The likelihood of gonadectomy depends on the underlying diagnos is, sex of rearing and the geographical setting. Clinical benchmarks, which can be studied across all f orms of DSD will allow a better understanding of the variation in the practice of gonadectomy.