Asle C. Hesla

1 Introduction Spindle cell (SCL) and pleomorphic lipomas (PL), initially described as two distinct entities [1, 2], are today considered morphological variants of a single tumor entity—spindle cell lipoma and pleomorphic lipoma (SCLPL)—within a spectrum of overlapping histological features [3]. The clinical features include a predominantly subcutaneous location, typically in the posterior neck or upper back, and a strong male predominance.

Abstract Background Current risk models in solitary fibrous tumour (SFT) were developed using cohorts with short follow-up and cannot reliably identify low-risk patients. We recently developed a novel risk model (G-score) to account for both early and late recurrences. Here, we aimed to validate the G-score in a large international cohort with long-term follow-up. Methods Data were collected from nine sarcoma referral centres worldwide. Recurrence-free interval (RFi) was the primary endpoint.