A novel classification of testicular sex cord‐stromal tumours from the Testicular Sex Cord‐Stromal Tumour ( TESST ) group: a collaboration of the Genitourinary Pathology Society ( GUPS ) and the International Society of Urological Pathology ( ISUP )

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AIMS: Testicular sex cord-stromal tumours (TSCSTs) are rare neoplasms that arise from (or show differentiation to) elements derived from the sex cords or intertubular stroma. The current classification (World Health Organization, 2022) is based almost entirely on morphology, with many tumour types such as granulosa cell tumours being defined based on their resemblance to ovarian counterparts. Recent studies have uncovered new clinicopathological, molecular and biological nuances within this group of tumours, underscoring differences with ovarian homologues. METHODS AND RESULTS: Considering the new data, a group of genitourinary pathology experts (Testicular Sex Cord-Stromal Tumour [TESST] group) has proposed a revised 'TESST classification' that incorporates the best available evidence. This classification is structured and hierarchical, composed of the following tiers: (1) group, (2) category, (3) entity and (4) histological pattern. 'Group' refers to the histological compartment a specific tumour belongs to (sex cords, stroma or both), whereas 'category' is defined by the phenotype of the tumour, taking non-neoplastic elements of the ovary and testis as a reference. The third tier, 'entity', refers to neoplasms with shared clinicopathological and/or molecular features that justify classifying them as distinct types. Lastly, 'histological patterns' are recurrent morphological variations within entities that are not linked to distinct clinicopathological or molecular features. CONCLUSIONS: We propose a classification that will provide a framework to improve current clinical management and guide future research in the field.

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