Smooth muscle tumor of uncertain malignant potential (STUMP): a case-based analysis.

Objectives: The present study aimed to analyze of uterine smooth muscle tumors of uncertain malignant potential (STUMP) and the outcomes of patients with STUMP.

Material and methods: In this retrospective study, the data of patients diagnosed with STUMP in a single tertiary center between January 2005-January 2020 were reviewed. We assessed the demographic variables, treatment outcomes, time until recurrence, disease-free and overall survival of the patients.

Results: Twenty-five patients diagnosed with STUMP were included in the study. The mean age of the patients was 43.2 ± 10.3 years. Thirteen of the 25 patients (52%) were treated by myomectomy, others received diagnoses following hysterectomy. The median follow-up time was 45.2 months. Recurrence was observed in three cases (12%), two of which were followed up without hysterectomy, and the third patient died by peritonitis carcinomatosa 60 months after diagnosis although she received cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (HIPEC) treatment.

Conclusions: This study evaluates the data of patients with STUMP. Our results reveal a STUMP recurrence of 12%, like those previously reported in the literature. Despite the possibility of malignant recurrence, fertility-preserving treatment with close follow-up should be tried, because of the relatively early age at diagnosis.