Insulinoma-associated protein (INSM1) is a sensitive and specific marker for lung neuroendocrine tumors in cytologic and surgical specimens
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1 Insulinoma-associated protein (INSM1) is a sensitive and specific marker for lung neuroendocrine tumors in cytologic and surgical specimens Kartik Viswanathan, M.D., Ph.D New York Presbyterian - Weill Cornell Medicine Department of Pathology and Laboratory Medicine New York, NY-10021, USA September 11 th, 2018
2 Enterprise Interest None
3 Fine needle aspiration is useful in the initial workup of a lung mass Minimally invasive Can help provide a definitive diagnosis Sensitivity: 91.5%, Specificity: 72.5% (Modi M.B et al. 2016) Cytology samples can be used for molecular testing
4 Neuroendocrine differentiation alters management of lung cancer Image courtesy Dr. David Lam, CME (January 2015)
5 Current immunohistochemical markers for neuroendocrine differentiation CD56 Synaptophysin Chromogranin A Membranous Sensitivity: % Specificity: 95% Cytoplasmic Sensitivity: % Specificity: 95% Cytoplasmic Sensitivity: % Specificity: 100% can be negative in up to 10-25% of high grade neuroendocrine carcinomas Need for additional sensitive and specific neuroendocrine markers
6 Insulinoma-associated protein 1 (INSM1) is a novel neuroendocrine marker Nuclear transcription factor identified in 1992 Plays a role in neuronal differentiation Promotes endocrine differentiation in organs e.g. pancreas, pituitary etc. Can be highly expressed in neuroendocrine tumors
7 Insulinoma-associated protein 1 (INSM1) is a useful neuroendocrine marker Middle ear adenoma Olfactory neuroblastoma Small cell carcinoma-cervix Small cell carcinoma-prostate GI neuroendocrine Merkel cell carcinoma
8 INSM1 is a useful neuroendocrine marker in lung biopsy and surgical specimens H&E INSM1 Small cell carcinoma CD56 ChgA Images courtesy Rooper et al. AJSP 2017
9 INSM1 is a useful neuroendocrine marker in pulmonary cytology H&E INSM1 IHC Small cell carcinoma Adenocarcinoma Images courtesy Doxtader et al. Cancer Cytopathology 2018
10 What is not known? INSM1 staining in atypical carcinoids was not assessed in cytology Doxtader et al. only had one large cell neuroendocrine carcinoma in their cytology cohort INSM1 specificity among other lung tumor types has not been extensively characterized
11 Assessment of INSM1 in cytologic and surgical specimens Retrieval of cytology cell blocks with corresponding surgical resections between Typical carcinoids (TC) 12 Atypical carcinoids (AC) 11 Small cell neuroendocrine carcinoma (SCLC) 10 Large cell neuroendocrine carcinoma (LCNEC) 9 Squamous cell carcinoma (SCC) 10 Adenocarcinoma (ADC) 12
12 Assessment of INSM1 in cytologic and surgical specimens Tissue microarrays Adenocarcinoma 428 cases Squamous cell carcinoma 10 cases Large cell carcinoma (LCC) 17 cases Other subtypes 24 cases Adenosquamous carcinoma (10 cases) Sarcomatoid carcinoma (11 cases) Solitary fibrous tumor (2 cases) Inflammatory myofibroblastic tumor (1 case)
13 Assessment of INSM1 in cytologic and surgical specimens INSM1 (SantaCruz Biotech, C-8 clone, 1:100) was used for immunohistochemistry Grading: Positive if at least 1+ and staining >5%
14 Clinicopathologic parameters N = 60 patients Average age: 67 years (Range: years) M:F ratio: 1.1:1 Tumor size: 3 cm (Range: cm) Tumor source: All cases were of pulmonary origin 78.3% cases were primary 21.7% cases were secondary metastases to liver and lymph nodes
15 INSM1 IHC in Cytologic specimens H&E INSM1 IHC Typical carcinoid Atypical carcinoid
16 H&E INSM1 IHC Small cell carcinoma Large cell neuroendocrine carcinoma
17 H&E INSM1 IHC Squamous cell carcinoma Adenocarcinoma
18 INSM1 IHC in Surgical Specimens H&E INSM1 IHC Typical carcinoid Atypical carcinoid
19 H&E INSM1 IHC Small cell carcinoma Large cell neuroendocrine carcinoma
20 H&E INSM1 IHC Squamous cell carcinoma Adenocarcinoma
21 INSM1 performance summary in cytology specimens Tumor type Negative Positive Total % Positive Typical carcinoid % Atypical carcinoid % Small cell neuroendocrine carcinoma % Large cell neuroendocrine carcinoma % Squamous cell carcinoma % Adenocarcinoma % Total
22 INSM1 performance summary in surgical resections and tissue microarrays Tumor type Negative Positive Total % Positive Typical carcinoid % Atypical carcinoid % Small cell neuroendocrine carcinoma % Large cell neuroendocrine carcinoma % Squamous cell carcinoma % Adenocarcinoma % Large cell non-neuroendocrine carcinoma % Other subtypes % Total
23 Overall performance for INSM1 INSM1 Cytology INSM1 surgical specimens CD56* Synaptophysin* Chromogranin A* Sensitivity 90.5% 92.9% % % % Specificity 100% 97.9% 95% 95% 100% Positive Predictive Value Negative Predictive Value 100% 92.9% 98% 98% 100% 80% 97.9% 100% 88% 46% *Data courtesy Doxtader et al. Cancer Cytopathology 2018, Fujino et al. International Journal of Clinical and Experimental Pathology, 2017
24 Advantages of INSM1 IHC High sensitivity and high specificity Nuclear staining Useful in cases of extensive necrosis nonspecific background staining can occur with Chromogranin A, Synaptophysin, CD56
25 Limitations of INSM1 IHC INSM1 can show focal false-positive staining in NSCLC cases False-negative cases can also occur with INSM1 Small number of cytology cases
26 Conclusions INSM1 is a sensitive and specific marker for neuroendocrine differentiation in pulmonary tumors Comparable to CD56, Synaptophysin and Chromogranin A Will INSM1 replace the traditional markers CD56, Chromogranin A, Synaptophysin?
27 Acknowledgements Mentors - Dr. Alain C. Borczuk - Dr. Momin T. Siddiqui Translational Research Program at Weill Cornell Medicine - Bing He - Yifang Lu
28 References 1. Travis W, Brambila E, Burke AP et al. WHO Classification of Tumors of the Lung, Pleura, Thymus and Heart. 4th ed. 2015, Lyon, France: IARC. 2. Rooper LM, Sharma R, Li QK et al. INSM1 Demonstrates Superior Performance to the Individual and Combined Use of Synaptophysin, Chromogranin and CD56 for Diagnosing Neuroendocrine Tumors of the Thoracic Cavity. Am J Surg Pathol, (11): p Doxtader EE and Mukhopadhyay S. Insulinoma-associated protein 1 is a sensitive and specific marker of neuroendocrine lung neoplasms in cytology specimens. Cancer Cytopathology, (4): p Rosenbaum JN, Guo Z, Baus RM et al. INSM1: A Novel Immunohistochemical and Molecular Marker for Neuroendocrine and Neuroepithelial Neoplasms. Am J Clin Pathol, (4): p Ionescu DN, Treaba D, Gilks CB et al. Nonsmall cell lung carcinoma with neuroendocrine differentiation--an entity of no clinical or prognostic significance. Am J Surg Pathol, (1): p Fujino K, Yasufuku K, Kudoh S et al. INSM1 is the best marker for the diagnosis of neuroendocrine tumors: comparison with CGA, SYP and CD56. International Journal of Clinical and Experimental Pathology, (5): p Rooper LM, Bishop JA and Westra WH. INSM1 is a Sensitive and Specific Marker of Neuroendocrine Differentiation in Head and Neck Tumors. Am J Surg Pathol, (5): p Thunnissen E, Borczuk AC, Flieder DB et al. The Use of Immunohistochemistry Improves the Diagnosis of Small Cell Lung Cancer and Its Differential Diagnosis. An International Reproducibility Study in a Demanding Set of Cases. Journal of Thoracic Oncology, (2): p
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