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1 Enterprise Interest None
2 What are triple negative breast cancers? A synopsis of their histological patterns Ian Ellis Molecular Medical Sciences, University of Nottingham Department of Histopathology, Nottingham University Hospitals NHS Trust
3 ER neg ER pos Sorlie, et al. PNAS 2001
4 Two main groups: luminal (majority) and basal groups The concept of BP has been known for some time First described using electron microscopy >30 years age Its potential poor survival first reported by Dairkee et al in 1987 High frequency in BRCA1 gene mutation carriers
5 Additional molecular subtypes enriched for TNBCs: claudin-low - EMT phenotype molecular apocrine - activated AR pathway. basal-like 1 basal-like 2 luminal AR immunomodulatory mesenchymal mesenchymal stem-like Basal like/immune-suppressed basal-like/immune activated luminal AR mesenchymal
6 Special types of breast cancer are more homogeneous at the transcriptome level Luminal Basal-like Mol apocrine Mucinous A Classic ILC/ Tubular Mucinous B Neuroendocrine Micropapillary Adenoid cystic Medullary Metaplastic Pleomorphic ILC Apocrine Weigelt et al. J Pathol 2008
7 Triple Negative Breast Cancer
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13 ER
14 PR
15 HER 2
16 Ck 5 6
17 Ck 14
18 Association between BP and survival, whole series
19 Overlap of BRCA1 and Basal-like Genotypes Basal Sub-Type BRCA1 mutated Sorlie PNAS 2003
20 Familial Breast Cancer BRCA 1 Phenotype Histological features High grade and mitotic count Medullary or atypical medullary type Molecular features ER & PR negative HER2 negative P53 positive Basal ck positive
21 Familial Breast Cancer BRCA 1 basal phenotype Ck 5/6&14 +ve - 44% of all BRCA 1 carriers Ck 5/6&14 +ve < 2% sporadic cancers Lakhani Clin Cancer Res
22 Basal-like carcinomas BRCA1 tumours Ploidy Aneuploid Aneuploid Most frequent copy number gains Most frequent copy number losses 1q 3q 6p 7p 7q 8q 10p 17q22-qtel 21q 3p 4q 5q 6q 12q 13q 14q 1q 3q 7p 8q 10p 12p 17q22-qtel 3p 4p 5q 12q 16p 18q BRCA1 gene mutations Absent Present
23 BRCA1 downregulation High histological grade Medullary histological type Basal-like immunophenotype
24 Hypothesis BRCA1 inactivation in Basal-Like cancers Gene promoter methylation Transcriptional inactivation
25 BRCA1 methylation ER ve PR ve High histological grade Medullary histological type Catteau et al. Oncogene, 1999; Esteller et al. JNCI 2000; Osin et al. Int J Surg Pathol, 2003
26 BRCA1 methylation in metaplastic breast carcinomas U M U M U M U M U M U M U M U M BRCA1 gene promoter methylation 17/ 27 (63%) Type BRCA1 M BRCA1 U Metaplastic IDC-basal 4 25 p<0.0005
27 Basal-like carcinomas? BRCA1 downregulation BRCA1 methylation Salivary gland-like tumours IDC Basal-like Medullary Metaplastic
28 WHO 2012 Carcinoma with medullary features Definition - Carcinomas with medullary features include medullary carcinomas (MC) atypical MC a subset of invasive ductal carcinomas of no special type These tumours demonstrate all or some of the following features: a circumscribed or pushing border a syncytial growth pattern cells with high-grade nuclei prominent lymphoid infiltration.
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34 Metaplastic ( sarcomatoid ) Carcinoma Histological classification Monophasic sarcomatoid carcinoma or spindle cell carcinoma Biphasic sarcomatoid carcinoma or malignant mixed tumour (carcinosarcoma) Low grade adenosquamous carcinoma
35 Metaplastic ( sarcomatoid ) Carcinoma Microscopic features Monophasic sarcomatoid carcinoma Composed predominantly of elongated plump cells of relatively monotonous appearance Mitoses are variable in number but are usually plentiful An invasive epithelial element or foci of high grade DCIS can be identified in a minority of cases
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42 Metaplastic ( sarcomatoid ) Carcinoma Biphasic sarcomatoid carcinoma Microscopic features Mesenchymal element is usually fibrosarcomatous or malignant fibro-histiocytoma-like More rarely chondrosarcomatous, osteosarcomatous, leiomyosarcomatous or angiosarcomatous elements are present The epithelial component is usually of ductal NST pattern, grade 2 or 3 but may have squamous features High grade DC1S is present in up to 50% of cases
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45 Low grade adenosquamous carcinoma Originally described by Rosen in 1987, Am J Surg Pat Lesions characterised by small glandular structures with varying amounts of epidermoid differentiation embedded in a collagenous stroma Tendency to grow between and around ducts and lobules Round to oval glands Can have spindle cell and syringomatous areas Squamous component 5-80% Clusters of inflammatory cells at the periphery All ER/PgR negative
46 Low grade adenosquamous carcinoma Association with underlying fibrosclerotic lesions including complex sclerosing lesions, papillary lesions and nipple adenomas Lymph node involvement rare Metastatic disease - exceptional
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51 Triple Negative Breast Cancer
52 Salivary gland like tumours of the breast Benign Mixed tumour Adenomyoepithelioma Benign myoepithelioma Malignant Acinic cell carcinoma Adenoid cystic carcinoma Low grade adenosquamous carcinoma Oncocytic carcinoma Mucoepidermoid carcinoma Malignant myoepithelioma
53 Adenoid cystic carcinoma 0.1 1% of breast cancers Wide age range Mass lesion, often periareolar, may be painful Well defined Excellent long term prognosis ->90-100% 10 year survival (cf salivary gland tumours)
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56 Epithelial cells EMA CD117 CK7
57 Basaloid cells p63 vimentin CK14
58 Adenoid cystic carcinoma Cribriform, solid, tubular, reticular, basaloid patterns Dual population: epithelial and basaloid cells Epithelial: CK7, CEA, EMA, CD117 Basaloid: CK14, CD17, vimentin,s100, actin, calponin, p63 May be associated with microglandular adenosis
59 Adenoid cystic carcinoma- molecular pathology Clusters with metaplastic and medullary carcinomas triple negative Translocation t (6;9) (q22-23; p23-24) similar to salivary and other adenoid cystic carcinomas
60 AcCC of the breast Clinicopathological features First report by Roncaroli 1996 Acinic cell-like carcinoma of the breast. Virchows Arc 1996;429:69-74 Defined by serous differentiation Infiltrative margin Microglandular areas merging with solid aggrageates Intraluminal inspisssated secretion Stroma can be fibro-fatty without desmoplasia
61 AcCC of the breast Morphology II Abundant eosinophilic or amphophilic granular cytoplasm Variable mitotic count Immunohistochemistry: + Luminal cytokeratins, S100, Lysosyme, alfa 1- antitrypsin, alfa-amylase(focal, scanty), IgA, E Cadherin - Basal cytokeratins, ER, PR, HER 2, GCDFP EM: membrane bound zymogen granules um
62 Actin
63 Actin
64 Actin
65 Actin
66 Actin Amylase
67 Actin Lysozyme
68 S100 Actin
69 Actin
70 Actin
71 Differential diagnosis Tumours with granular cytoplasm Neuroendocrine carcinoma ICH Oncocytic tumours mitochondria Apocrine carcinoma GCDFP 15 Tumours with architectural similarities Microglandular adenosis Secretory carcinoma
72 AcCC v MGA Overlapping arhitectural features-small glandular/acinar structure without myoepthelial layer IHC similarities- CK,S100,Lysosyme, ER, Her2 Morphological similarities between MGA and AcCC Transitional forms do exist Reported carcinomas associated with MGA retain the acinar architecture High rate of invasive carcinoma reported with MGA But AcCC usually with solid areas Lack of BM IHC differencies-ema,?amylase Zymogen granules on EM
73 AcCC v. Secretory carcinoma Secretory carcinoma is analogous to AcCC of microcystic, follicular and papillary cystic type Similar IHC:Lysosyme+, S100+, alfa 1-antitrypsin+, alfa-amylase+, IgA+ ER-, Her 2- Hirokawa Histopathology 2002, 40,
74 Secretory carcinoma First identified by McDivitt & Stewart in 1966 as a children s breast cancer but later recognised as also occuring in young, and a few adults. Male association Usually present as a well defined sub-areolar mass Prognosis is favourable and is thought to be better in children than in adults Local recurrences, if developed, are late Lymph node metastasis are uncommon Distant metastasis are exceedingly rare Death is unusual, but has been reported
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77 D PAS
78 ER
79 Secretory carcinoma Low nuclear grade with vacuolated cytoplasm which may contain eosinophilic secretion arranged in cribriform patterns with the spaces containing eosinophilic secretions Typically, they show strong reactivity with S100 They are mostly triple negative Express basal cytokeratins, and belong to the basallike molecular group of breast cancers Genetically they are characterised by the presence of a chromosomal translocation t(12;15)(p13;q25) which results in the formation of ETV6-NTRK3 fusion gene
80 Triple Negative Breast Cancer
81 Do not forget
82 Invasive Apocrine Carcinoma Rare subtype in pure form % Focal apocrine differentiation common 60% NST on morphology 72% express GCDFP Lack of robust criteria
83 Invasive Apocrine Carcinoma Presentation, prognostic characteristics and behaviour similar to NST Immunophenotype ER neg PR neg AR pos
84 Actin
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