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The Large-Mass Phenotype of Uterine Smooth Muscle Tumor of Uncertain Malignant Potential (STUMP): A Clinicopathological Analysis of 37 Cases in Indonesia Using WHO 2021 and Modified Stanford Criteria Yuliza Ariani; Henny Mulyani; Noza Hilbertina; Yenita; Aswiyanti Asri; Tofrizal; Loli Devianti; Hera Novianti
Bioscientia Medicina : Journal of Biomedicine and Translational Research Vol. 10 No. 4 (2026): Bioscientia Medicina: Journal of Biomedicine & Translational Research
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/bsm.v10i4.1565

Abstract

Background: Uterine smooth muscle tumor of uncertain malignant potential (STUMP) presents a diagnostic dilemma, especially in Southeast Asian populations, where delayed presentation often leads to advanced tumor burden. This study aimed to characterize the clinicopathological profile of STUMP in Indonesia using the 2021 WHO Classification and modified Stanford parameters. Methods: A descriptive study analyzed 37 STUMP cases diagnosed between 2023 and 2025 at a tertiary referral center in West Sumatra. A panel of pathologists re-evaluated archival slides for atypia, mitotic activity, necrosis, and growth patterns, establishing inter-observer reliability. Fisher’s Exact Test was employed to correlate tumor size with morphological markers of aggression. Results: The cohort demonstrated a distinct large-mass phenotype, with 54.1% of tumors exceeding 10 cm and a median diameter of 14.5 cm. Pathological review classified 56.8% of cases into WHO Group 4 (atypia with ambiguous mitosis). A statistically significant correlation was identified between tumor size >10 cm and the presence of infiltrative growth margins (81.1%; p=0.034). Conclusion: Indonesian STUMP cases are distinctively characterized by massive size and high rates of infiltrative growth, likely driven by prolonged natural history. The prevalence of ambiguous mitotic figures underscores the utility of the WHO Group 4 category in resource-limited settings. These findings advocate for aggressive surgical management and wider resection margins in large-mass variants to mitigate local recurrence risk.
Co-Authors Abdiana Abdiana, Abdiana Afdal Afdal Afriani Afriani, Nita Aini, Julpa Nurul Aizah, Havina Nurul Aljassri, Resti Karunia Alvarino Alvarino Amel Yanis Aqilah, Giffary Zahida Ariani, Novita Arnofyan, Budi Pratama Asri, Ennesta Aswiyanti Asri Aswiyanti Asri Athika Rahmawati Avit Suchitra Azmal, Nita Afriani Cimi Ilmiawati, Cimi Daan Khambri Daan, Khambri Deddy Saputra Deddy Satriya Putra Desmawati Desmawati Dessy Arisanty Djong Hon Tjong Dolly Irfandy Dwi Yanti Fioni Putri Dwisari Dillasamola Elli Firdamila Elmatris Sy Endrinaldi Ennesta Asri Erkadius Erkadius Eryati Darwin Eryati Darwin Eti Yerizel Fachry Abda El Rahman Fadhilah, Maisarah Fadil Oenzil Fadila, Srigunda Arisya Fadillah Fadillah Fajriza Yona Fesdia Sari Firdamila, Elli Gardenia Akhyar Gusti Revilla Hafni Bachtiar Handriyani, Fitri Nur Hasmiwati henny Mulyani Henny Mulyani Hera Novianti Hirowati Ali, Hirowati Husna Yetti Intan, Shinta Ayu Kamelia, Muthia Khotimah, Rifqoh Kusumardani, Dini Loli Devianti Lubis M Mahata, Liganda Endo Maliza, Rita Mayorita, Pamelia Miftah Irramah Muhammad Idris Muhammad Nazri Janra Mustika Sari Naqia, Masyithah Nita Afriani Nofrita Nofrita Novita Ariani Noza Hilbertina Noza Hilbertina, Noza Noza, Hilbertina Nur Afrinin Syah Nuzulia Irawati Perisnawati, Pemi Putra Santoso Putri Amran, Fajriana Anggun Putri, Biomechy Oktomalio Putri, Nabila Priscilla R. Zuryati Nizar Rahmadian, Rizki Rauza Sukma Rita Raymond, Benni Restu Susanti Ria Oktavia Ria Oktavia Rina Gustia Rio Hendra Robby Jannatan Rony Rustam Runky Pebranka Rusnita, Dewi RZ Nizar Safnita, Dewi Salmiah Agus Salmiah Agus Salmiah Agus Salmiah Agus Sari, Rini Purnama Selfi Renita Rusjdi, Selfi Selly Alinta Syukri Sisca Dwi Yarni Siti Nurhajjah Sri Lestari SRI LESTARI Sri Wahyuni Handayani Sri Wahyuni Handayani, Sri Wahyuni Suci Rahmadhani Sukri Rahman Syamel Muhammad Tiffany, Begum Utama, Bobby Indra Yarni, Sisca Dwi Yenita . Yenita Yenita Yenny Raflis Yerizal, Eti Yessy Setiawati Yessy Setiawati Yuliza Ariani Zehan Afifa Yusran Zulfadli Syahrul, Muhammad