The 2015 World Health Organization Classification for Lung Adenocarcinomas: A Practical Approach
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1 The 2015 World Health Organization Classification for Lung Adenocarcinomas: A Practical Approach Dr. Carol Farver Director, Pulmonary Pathology Pathology and Laboratory Medicine Institute Objectives Discuss the history of the World Health Organization classifications for lung adenocarcinomas Define new terminology for low grade adenocarcinomas Review the evidence that the new classification for adenocarcinomas has prognostic significance The 2015 WHO New emphasis on genetic/molecular studies Use of immunohistochemistry New classification for small biopsies and cytology Adenocarcinoma classification Large cell carcinoma: restriction of diagnosis Squamous cell carcinoma: keratinizing and nonkeratinizing Neuroendocrine tumor: grouping into one classification Other changes to note 1
2 WHO Classification Lung Adenocarcinoma 2015 Adenocarcinoma in situ Minimally invasive adenocarcinoma Subtypes of adenocarcinoma Lepidic Invasive mucinous adenocarcinoma Micropapillary Quantitation of subtypes Spread Through the Air Spaces (STAS) Cleveland Clinic 2014 Total Carcinoma Surgical Specimens Small Large Carcinoid Squamous Adenocarcinoma WHO Classification Lung Adenocarcinomas 1981 Adenocarcinoma: Acinar adenocarcinoma Papillary adenocarcinoma Bronchioloalveolar carcinoma Solid adenocarcinoma with mucin formation 2
3 Acinar Papillary Solid 3
4 Solid Adenocarcinoma: Mucicarmine Stain Bronchioloalveolar WHO Classification Lung Adenocarcinomas 1999/2004 Acinar Papillary Bronchioloalveolar carcinoma Non-mucinous Mucinous Mixed mucinous and non-mucinous Solid adenocarcinoma with mucin Adenocarcinoma with mixed subtypes 4
5 Bronchioloalveolar, non-mucinous type Predominantly BAC Mixed with acinar and BAC 5
6 BAC Predominantly BAC Mixed with Acinar and BAC Travis W, et al J Clin Oncol 2011; 6(2): IASLC/ATS/ERS Lung Adenocarcinomas Bronchioloalveolar carcinoma Non-mucinous Mucinous Mixed mucinous/nonmucinous 2011 Adenocarcinoma in situ Minimally invasive adenocarcinoma Lepidic predominant adenocarcinoma Invasive adenocarcinoma with lepidic component 6
7 WHO Classification Lung Adenocarcinomas 2015 Adenocarcinoma in situ Minimally invasive adenocarcinoma Lepidic predominant adenocarcinoma Invasive adenocarcinoma with lepidic component Adenocarcinoma in situ, non-mucinous type 7
8 Adenocarcinoma in situ, non-mucinous type Adenocarcinoma in situ, non-mucinous type Adenocarcinoma in situ mucinous type 8
9 Adenocarcinoma, mucinous type BAC,mucinous type WHO Classification Lung Adenocarcinoma 2004 Precursor lesion: Atypical adenomatous hyperplasia (AAH) Adenocarcinomas: Acinar Papillary Bronchioloalveolar -Mucinous -Non-mucinous -Mixed / indeterminate Solid with mucin formation 9
10 AAH < 5mm WHO Classification Lung Adenocarcinomas 2015 Adenocarcinoma in situ > 5 mm < 3 cm Minimally invasive adenocarcinoma Lepidic predominant adenocarcinoma Invasive adenocarcinoma with lepidic component 10
11 Minimally invasive adenocarcinoma Minimally invasive adenocarcinoma Minimally invasive adenocarcinoma 11
12 Minimally invasive adenocarcinoma Minimally invasive adenocarcinoma Minimally invasive adenocarcinoma 12
13 WHO Classification Lung Adenocarcinomas 2015 Minimally invasive adenocarcinoma (MIA) Adenocarcinoma in situ with <5mm scar 2015 WHO Classification Adenocarcinoma in situ Minimally invasive adenocarcinoma WHO Classification Lung Adenocarcinomas 2015 Adenocarcinoma in situ Minimally invasive adenocarcinoma Lepidic predominant adenocarcinoma Invasive adenocarcinoma with lepidic component 13
14 Predominantly Lepidic Adenocarcinoma Mixed adenocarcinoma with lepidic pattern Adenocarcinoma in situ 2015 WHO Classification Minimally invasive adenocarcinoma Lepidic predominant Mixed with lepidic subtype 14
15 WHO Classification Lung Adenocarcinoma 2015 Adenocarcinoma in situ Minimally invasive lesions Subtypes of adenocarcinoma Lepidic Invasive mucinous adenocarcinoma Micropapillary Quantitation of subtypes Spread Through the Air Spaces (STAS) Adenocarcinoma in situ mucinous type Invasive mucinous adenocarcinoma 15
16 Invasive mucinous adenocarcinoma WHO Classification Lung Adenocarcinoma 2015 Adenocarcinoma in situ Minimally invasive lesions Subtypes of adenocarcinoma Lepidic Invasive mucinous adenocarcinoma Micropapillary Quantitation of subtypes Spread Through the Air Spaces (STAS) Micropapillary 16
17 Papillary Micropapillary Micropapillary 17
18 Micropapillary Lymphatic spread Spread Through Airspaces (STAS) A pattern of invasion Tumor in airspaces beyond the edge of the tumor Micropapillary, solid nests or single cellls Not measured as part of tumor Reported separately like pleural and vascular invasion. Micropapillary Spread through airspaces 18
19 WHO Classification Lung Adenocarcinoma 2015 Adenocarcinoma in situ Minimally invasive lesions Subtypes of adenocarcinoma Lepidic Invasive mucinous adenocarcinoma Micropapillary Quantitation of subtypes Spread Through the Air Spaces (STAS) Acinar type 19
20 Solid Type 20
21 Cribriform variant of Acinar type Interobserver Variability of Histopathological Subtypes in Lung Adenocarcinoma Typical cases Difficult cases Thunnissen E, et al. Mod Path 2012;25: Stage 1A Lung Adenocarcinomas Histologic Subtype and Prognosis months Murakami S et al. Lung Cancer 2015;90:
22 Prognosis Based on Predominant Histologic Pattern Euguchi T, et al. Semin Thoracic Surg 2014;26: Therapeutic Implications Can AIS, MIA and Lepidic predominant adenocarcinomas be treated less aggressively? Minimal surgeries Less or no adjuvant therapies Recurrence By Lepidic Predominant Subtypes Kadota K, et al. Am J Surg Pathol 2014;38:
23 Overall Survival Stage 1 Adenocarcinomas n=150 < 2cm Years Post Surgery Years Yoshiya T et al. Ann Thorac Surg 2016; 102: Therapeutic Implications Can AIS, MIA and Lepidic predominant adenocarcinoma be treated with less aggressive surgeries? Cannot be diagnosed on biopsy Wedge excision Frozen section analysis requires entire tumor to be evaluated Two step procedure Therapeutic Implications Can AIS, MIA and Lepidic predominant adenocarcinomas be treated less aggressively? Minimal surgeries Less or no adjuvant therapies 23
24 Overall Survival Stage 1 Adenocarcinomas Retrospective Chemotherapy vs No Chemotherapy Lepidic Predominant Non-Lepidic Predominant Sasada S et al. Clin Lung Cancer 2015;17: The WHO Classification of Lung Adenocarcinomas Preinvasive lesions Atypical adenomatous hyperplasia Adenocarcinoma in situ (<3cm) Mucinous Mixed mucinous or nonmucinous Minimally invasive adenocarcinoma (< 3cm) Lepidic predominant with <5 mm invasion Mucinous Nonmucinous Mixed The WHO Classification of Lung Adenocarcinomas Invasive adenocarcinoma Lepidic predominant Acinar predominant Papillary predominant Micropapillary predominant Solid predominant with mucin production Variants Invasive mucinous adenocarcinoma Colloid Fetal (low and high grade) Enteric 24
25 Summary The WHO classification for lung adenocarcinomas has introduced new terminology and categories for low grade adenocarcinomas Studies to date suggest these categories have prognostic implications Prospective studies are needed to evaluate the optimal therapies for these new categories Carol Farver, MD Pathology and Laboratory Medicine Cleveland Clinic Cleveland, Ohio USA 25
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