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Arisi MF, Jin X, Ravish NA, Chand MT, Baloch Z. How important are the cytomorphologic subtypes of the salivary gland neoplasm of uncertain malignant potential (SUMP) category in the Milan system for reporting salivary gland cytology? An institutional experience 2018-2024. Diagn Cytopathol 2024; 52:662-670. [PMID: 38970450 DOI: 10.1002/dc.25380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/21/2024] [Accepted: 06/27/2024] [Indexed: 07/08/2024]
Abstract
INTRODUCTION Salivary gland neoplasm of uncertain malignant potential (SUMP) is an important diagnostic category of the Milan System for reporting salivary gland cytology (MSRSGC). Further subcategorization by cytomorphologic subtypes has been recommended to risk-stratify cases. In this study, our institutional experience with the risk of neoplasm (RON) and risk of malignancy (ROM) based on cytomorphologic subcategorization of SUMP is reported. We also report the prevalence of malignancy (POM) at our institution. METHODS The pathology database was queried for cases of fine-needle aspiration (FNA) diagnosed as SUMP along with follow-up at our institution from 2018-February 2024. This study was approved by an institutional review board. RESULTS Of 1159 cases of salivary gland FNA specimens reported as per MSRSGC at our institution, 14.8% (171/1159 cases) were diagnosed as SUMP, with these reports verified by at least 16 cytopathologists. Surgical follow-up was available for 139/171 (81.3%) of these cases, for which the original cytomorphologic subgroups were as follows: 65 (46.8%) basaloid, 48 (34.5%) oncocytic/oncocytoid, 14 (10.1%) myoepithelial, 9 (6.5%) other, 2 (1.4%) clear cell, and 1 (0.7%) mucinous. The POM within SUMP at our institution is within a range of 29.8%-36.7%. When considering all cases, our institutional RON for SUMP was 97.8% (136/139), and the ROM was 36.7% (51/139). Notably, a significant portion of cases (36%, 50/139) underwent review at a daily intradepartmental consensus conference. Analysis revealed that SUMP cases that underwent consensus review had a ROM of 46% (23/50), versus 31.5% (28/89) in independently verified cases (p = .13). Of the cytomorphologic subgroups, basaloid SUMP in particular was more likely to be benign on resection when the case had been independently verified than after consensus review (p = .0082). When considering only the independently verified cases, the ROM for each subgroup was as follows: 38.7% (12/31) in oncocytic/oncocytoid, 20% (9/45) in basaloid, 33.3% (2/6) in myoepithelial, 60% (3/5) in "other", and 100% (1/1) in both mucinous and clear cell (p = .0407). CONCLUSION While the RON is high across all cytomorphologic subgroups of SUMP, the ROM does vary across the groups, with basaloid cytomorphology having the lowest ROM. This effect is seen in independently verified cases but not in cases having undergone consensus review.
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Affiliation(s)
- Maria Florencia Arisi
- Department of Pathology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Xueting Jin
- Department of Pathology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Nakul A Ravish
- Department of Pathology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Momal T Chand
- Department of Pathology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Zubair Baloch
- Department of Pathology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Agarwal S. A Retrospective Cytomorphologic Analysis of Salivary Gland Fine Needle Aspirates Classified as Salivary Gland Neoplasm of Uncertain Malignant Potential: A 6-year Institutional Experience. Diagn Cytopathol 2024. [PMID: 39140360 DOI: 10.1002/dc.25395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 07/30/2024] [Accepted: 07/31/2024] [Indexed: 08/15/2024]
Abstract
BACKGROUND The Milan System for Reporting Salivary Gland Cytopathology is an effective reporting system for salivary gland fine needle aspirations with well-established risks of malignancy. Salivary gland neoplasm of uncertain malignant potential (SUMP) comprises a heterogenous group of lesions which have features that can be recognized as at least neoplastic but preclude further classification into benign or malignant. In this study, we reviewed the cytomorphologic features of salivary gland fine needle aspirations diagnosed as SUMP at our institution (over the past 6 years) and correlated those with the final diagnosis on surgical follow up. DESIGN A retrospective search was performed to identify cases classified as SUMP at our institution from January 2018 to February 2024. Cytology slides were reviewed, and cases were subclassified based on key cytomorphologic features into the following categories: (1) basaloid, (2) oncocytic, (3) with clear cell features and (4) mixed features (myoepithelial/oncocytoid/squamoid features). Histologic diagnosis was recorded if available. RESULTS A total of 36 cases of SUMP were identified; 31/36 had surgical follow up; final diagnosis included 22 benign lesions (2 non-neoplastic and 20 benign neoplasms), and nine malignant lesions. The overall risk of neoplasm and risk of malignancy were 93.5% and 29% respectively, with the oncocytic sub-category recording the highest ROM (42.8%). Mucoepidermoid carcinoma was the most common malignant diagnosis and pleomorphic adenoma the most common benign diagnoses. CONCLUSIONS Our study supports the subclassification of SUMP lesions based on key cytomorphologic features, thereby aiding in refining this ambiguous entity and providing a precise risk assessment.
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Sanchez-Avila M, Tjendra Y, Zuo Y, Ruiz-Cordero R, Garcia-Buitrago M, Jorda M, Gomez-Fernandez C, Velez Torres JM. Don't SUMP it! Utility of PLAG1 immunocytochemistry in basaloid SUMP subcategory. Cancer Cytopathol 2024; 132:60-68. [PMID: 37702124 DOI: 10.1002/cncy.22762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/04/2023] [Accepted: 08/21/2023] [Indexed: 09/14/2023]
Abstract
BACKGROUND Basaloid salivary gland neoplasm of uncertain malignant potential (B-SUMP) is an indeterminate diagnostic subcategory, with pleomorphic adenoma (PA) representing the most common benign neoplasm. Pleomorphic adenoma gene 1 (PLAG1) staining is frequently seen in PAs and could aid in distinguishing them from other basaloid neoplasms. The authors evaluated the utility of PLAG1 immunocytochemistry (ICC) in differentiating PAs from other basaloid neoplasms in smears and liquid-based cytology (LBC) specimens. METHODS In total, 45 B-SUMP cytology aspirates and corresponding surgical excision specimens were identified. PLAG1 immunostaining was performed in all aspirates and surgical excision specimens and was scored as positive (strong/diffuse), equivocal (focal/weak), or negative. RESULTS PLAG1 ICC was performed directly on 38 smears and seven LBC specimens. PLAG1 was positive in 29 of 45 cases (64%), whereas six of 45 (13%) were equivocal, and 10 of 45 (22%) were negative. PLAG1-positive aspirates included 26 (90%) PAs, two (7%) basal cell adenomas (BCAs), and one (3%) carcinoma ex-PA. PLAG1-equivocal aspirates included four (67%) PAs and two (33%) BCAs, whereas negative aspirates included five (50%) BCAs, four (40%) adenoid cystic carcinomas, and one (10%) metastatic adenosquamous carcinoma. The sensitivity, specificity, positive, and negative predictive values were 87%, 86%, 93%, and 75%, respectively. Diagnostic accuracy was 87%. CONCLUSIONS PLAG1 ICC is useful when positive (strong/diffuse) and can be reliably performed on smears and LBC specimens. PLAG1 was positive in most PAs and in a small subset of BCAs. Therefore, in the absence of atypical cytologic features, PLAG1-positive tumors could be diagnosed as benign, with a note favoring PA versus BCA. In contrast, PLAG1-negative/equivocal tumors should remain in the B-SUMP category.
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Affiliation(s)
- Monica Sanchez-Avila
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
- Department of Pathology and Laboratory Medicine, Jackson Memorial Hospital, Miami, Florida, USA
| | - Youley Tjendra
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Yiqin Zuo
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Roberto Ruiz-Cordero
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Monica Garcia-Buitrago
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Merce Jorda
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Carmen Gomez-Fernandez
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Jaylou M Velez Torres
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
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Hang JF, Lee JJL, Nga ME, Higuchi K, Hirata Y, Wu HH, Allison DB, Gilbert JD, Lin O, Saieg M, de Arruda AF, Chen YA, Huang EC, Manucha V. Multi-institutional validation of a modified scheme for subcategorizing salivary gland neoplasm of uncertain malignant potential (SUMP). Cancer Cytopathol 2022; 130:511-522. [PMID: 35637575 DOI: 10.1002/cncy.22593] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/06/2022] [Accepted: 04/09/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND The salivary gland neoplasm of uncertain malignant potential (SUMP) category in the Milan System is diagnostically challenging. This study aims to validate a modified scheme for subcategorizing SUMP in a large multi-institutional cohort. METHODS Retrospective review of salivary gland fine-needle aspirations (FNAs) from 10 institutions were classified based on the Milan System. Cases diagnosed as SUMP with available cytology slides and surgical follow-up were retrieved for review and subcategorized based on a modified scheme as follows: basaloid SUMP (B1: absent/scant nonfibrillary matrix; B2: presence of nonfibrillary/mixed-type matrix), oncocytic/oncocytoid SUMP (O1: with mucinous background; O2: without mucinous background), and SUMP not otherwise specified (NOS). RESULTS A total of 742 (7.5%) cases from 9938 consecutive salivary gland FNAs were classified as SUMP. Among them, 525 (70.8%) had surgical follow-up and 329 (62.7%) were available for review. The overall risk of malignancy (ROM) of SUMP was 40.4%. There were 156 cases (47.4%) subcategorized as basaloid SUMP with a ROM of 36.5%, 101 (30.7%) as oncocytic/oncocytoid SUMP with a ROM of 52.5%, and 72 (21.9%) as SUMP NOS with a ROM of 31.9%. The ROM of oncocytic/oncocytoid SUMP was significantly higher than basaloid SUMP (P = .0142) and SUMP NOS (P = .0084). No significant differences in ROM were noted between B1 and B2 (36.7% vs 36.4%, P = 1.0000) and O1 and O2 (65.2% vs 48.7%, P = .2349). CONCLUSIONS The ROM of oncocytic/oncocytoid SUMP was 52.5% and significantly higher than that of basaloid SUMP (36.5%, P = .0142) and SUMP NOS (31.9%, P = .0084), whereas no significant differences in ROM were noted for cases with different types of extracellular matrix or background material.
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Affiliation(s)
- Jen-Fan Hang
- Department of Pathology and Laboratory Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.,School of Medicine and Institute of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | | | - Min En Nga
- Department of Pathology, National University Hospital, Singapore.,Department of Pathology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Kayoko Higuchi
- Department of Surgical Pathology, Okinawa Kyodo Hospital, Naha, Japan
| | - Yukiya Hirata
- Department of Pathology, University of the Ryukyus Hospital, Nishihara, Japan
| | - Howard H Wu
- Department of Pathology and Laboratory Medicine, Indiana University School of Medicine, Indianapolis, Indiana
| | - Derek B Allison
- Department of Pathology, University of Kentucky, Lexington, Kentucky
| | - Jason D Gilbert
- Department of Pathology, University of Kentucky, Lexington, Kentucky
| | - Oscar Lin
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Mauro Saieg
- Department of Pathology, A. C. Camargo Cancer Center, Sao Paulo, Brazil
| | | | - Yun-An Chen
- Department of Pathology and Laboratory Medicine, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Eric C Huang
- Department of Laboratory Medicine and Pathology, University of Washington School of Medicine, Seattle, Washington
| | - Varsha Manucha
- Department of Pathology, University of Mississippi Medical Center, Jackson, Mississippi
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Pusztaszeri MP, Baloch ZW. Subcategorizing salivary gland neoplasm of uncertain malignant potential (SUMP) in the Milan System for Reporting Salivary Gland Cytopathology. Cancer Cytopathol 2022; 130:484-487. [PMID: 35637574 DOI: 10.1002/cncy.22592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 04/25/2022] [Accepted: 04/25/2022] [Indexed: 11/11/2022]
Affiliation(s)
| | - Zubair W Baloch
- Department of Pathology, University of Pennsylvania Medical Center, Perelman School of Medicine, Philadelphia, Pennsylvania
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