Avances en patología gástrica. Novedades de la clasificación WHO (2010)
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1 XXV Congreso de la Sociedad Española de Anatomía Patológica y División Española de la International Academy of Pathology Avances en patología gástrica. Novedades de la clasificación WHO (2010) Fátima Carneiro IPATIMUP & Medical Faculty/Hospital SJoão Porto, Portugal FMUP/HSJ
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4 Precursor lesions GASTRIC CANCER Sporadic cancer Hereditary cancer Molecular pathology
5 Intraepithelial neoplasia versus Dysplasia Recognizing that the terminology of dysplasia is entrenched in the European and particularly North-American literature, as well as in clinical practice, WHO considers that intraepithelial neoplasia and dysplasia should be considered as synonymous terms. The following categories should thus be considered: 1. Negative for intraepithelial neoplasia /dysplasia* 2.Indefinite for intraepithelial neoplasia /dysplasia 3.Low -grade intraepithelial neoplasia/dysplasia 4.High-grade intraepithelial neoplasia/dysplasia 5.Intramucosal invasive neoplasia/intramucosal carcinoma *In stomach, and as far as these guidelines is concerned, category 1 includes lesions such as atrophic chronic gastritis and intestinal metaplasia. WHO 4th Edition, 2010
6 GASTRIC DYSPLASIA Phenotype Cell differentiation (gastric & non-gastric)
7 Dysplasia with gastric phenotype MUC5AC TFF1 Dysplasia with intestinal phenotype MUC5AC TFF1 MUC2 p53
8 Dysplasia, intestinal type Dysplasia, gastric type WHO 4th Edition, 2010
9 Neoplastic polyps Adenomatous polyps Intestinal type (MUC2, CD10) Gastric-type adenomas Foveolar type (MUC5AC) Pyloric-gland type (MUC6) Fundic gland polyps Carcinoma Neuroendocrine tumours WHO 4th Edition, 2010
10 Pyloric gland adenoma MUC 6
11 Gastric carcinoma ICD-O Code Adenocarcinoma 8140/3 Papillary adenocarcinoma 8260/3 Tubular adenocarcinoma 8211/3 Mucinous adenocarcinoma 8480/3 Signet-ring cell carcinoma 8490/3 WHO 3rd Edition, 2000
12 Tubular adenocarcinoma Papillary adenocarcinoma
13 Mucinous adenocarcinoma Signet-ring cell carcinoma
14 ICD-O Code Adenocarcinoma 8140/3 Papillary adenocarcinoma 8260/3 Tubular adenocarcinoma 8211/3 Mucinous adenocarcinoma 8480/3 Signet-ring cell carcinoma 8490/3 WHO 3rd Edition, 2000 Shortcomings: Signet-ring cell ca? Mixed ca?
15 Signet-ring cell carcinoma Signet-ring cell carcinoma without signet-ring cells
16 What about the mixed type of gastric carcinoma?
17 CDH1 mutations: 17% CDH1 mutations: 83% E-cadherin expression CDH1 mutations E-cadherin gene mutations provide a genetic basis for the phenotypic divergence of mixed gastric carcinomas Machado J et al: Lab Invest 79: 459, 1999
18 Laser microdissection Diffuse component Intestinal component
19 Mixed gastric carcinomas CAM 5.2 Diffuse component E-cadherin Intestinal component Carvalho B et al: Mixed gastric carcinomas show similar chromosomal aberrations in both their diffuse and glandular components Cellular Oncology 28:283, 2006 Park SY et al: Mixed-type gastric cancer and its association with high-frequency CpG island hypermethylation. Virchows Archive 456, 2010
20 Histological type Glandular (n=89) Isolated cell (n=14) Solid (n=28) Mixed (n=82) 5-year survival rate 52% 67% 48% 16% Carneiro F et al: Pathol Res Pract 191: 571, 1995 More recently confirmed: Zheng HC et al. Mixed-type gastric carcinomas exhibit more aggressive features and indicate the histogenesis of carcinomas. Virchows Archive 452, 2008
21 Morphology Molecular pathology
22 4-1 Gastric carcinoma Gregory Y. Lauwers Fátima Carneiro David Y. Graham Maria-Paula Curado Silvia Franceschi Elizabeth Montgomery Masae Tatematsu Takenori Hattori Papillary Mucinous Poorly cohesive Tubular Mixed Poorly cohesive (signet ring cell) ICD-O Code Adenocarcinoma 8140/3 Papillary adenocarcinoma 8260/3 Tubular adenocarcinoma 8211/3 Mucinous adenocarcinoma 8480/3 Poorly cohesive carcinoma 8490/3 (Signet-ring cell carcinoma and other variants) Mixed carcinoma 8255/3 WHO 4th Edition, 2010
23 The dawn of phenotypic classification of gastric adenocarcinoma A Despite acknowledging the Gastric type B existence of different phenotypic types, the WHO booklet does not recommend (yet?) it s utilization in daily practice Intestinal type WHO 4th Edition, 2010
24 Sporadic cancer Hereditary cancer Molecular pathology
25 New Chapter on:
26 GASTRIC CARCINOMA Sporadic (90%) Familial Aggregation (10%) Familial Gastric Cancer (FGC) Familial Intestinal Gastric Cancer (FIGC) Familial Diffuse Gastric Cancer (FDGC) Hereditary (1%)* Hereditary Diffuse Gastric Cancer (HDGC) * Most caused by E-cadherin alterations
27 Criteria for testing for E-cadherin gene mutation: updated recommendations from the International Gastric Cancer Linkage Consortium (IGCLC)* 1. Two or more documented cases of gastric cancer in first degree relatives, with at least one documented case of diffuse gastric cancer diagnosed before the age of 50 years 2. Three or more cases of documented diffuse gastric cancer in first- or second-degree relatives, independent of age of onset 3. Diffuse gastric cancer before the age of 40 years without a family history 4. Families with diagnoses of both diffuse gastric cancer and lobular breast cancer, with one case before the age of 50 years *In addition, in cases where expert pathologists detect carcinoma in situ adjacent to diffuse-type gastric cancer, genetic testing should be considered since this is rarely, if ever, seen in sporadic cases.
28 Hereditary Diffuse Gastric Carcinoma
29 4-3 Hereditary Diffuse Gastric Cancer Fátima Carneiro Amanda Charlton David Huntsman TNM stage Tis T1a Mucos a Muscula ris mucosa Submuc osa A B In situ carcinoma Pagetoid spread T1a intramucosal signet-ring cell WHO 4th Edition, 2010
30 Thanks for your attention
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