proliferative epithelial lesions of the breast sami shousha, md, frcpath charing cross hospital...
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Proliferative Epithelial lesions of the Breast
Sami Shousha, MD, FRCPath
Charing Cross Hospital &
Imperial College, London
Amman, November2013
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Proliferative Epithelial Lesions of the Breast
Usual type ductal hyperplasia Columnar cell change Columnar cell Hyperplasia Flat epithelial atypia Atypical ductal hyperplasia Intraductal/ intracystic papillary lesions In situ lobular neoplasia
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Proliferative Epithelial Lesions of the Breast
Usual type ductal hyperplasia Columnar cell change Columnar cell Hyperplasia Flat epithelial atypia Atypical ductal hyperplasia Intraductal/ intracystic papillary lesions In situ lobular neoplasia
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Florid Regular Hyperplasia
The proliferating cells are similar to the normal cells lining the ducts
The cells are haphazardly arranged, may overlap or have a streaming arrangement
When spaces are present, they are irregular and mostly peripheral
An occasional mitotic figure may be present
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Florid Regular Hyperplasia vs. Low grade DCIS
If still in doubt:
Stain for cytokeratin 5
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CK 5
There is a mixture of positive and negative cells (polyclonal)
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CK 5
Malignant (& atypical) cells are CK 5 negative (monoclonal)
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CK5/6
ER
Diagnosis: Florid usual type uctal hyperplasia
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F20, Right breast lump
CK5/6
Diagnosis: Complex Sclerosing Lesion with Florid Usual Type Ductal Hyperplasia
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CK5/6
Diagnosis: DCIS
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Proliferative Epithelial Lesions of the Breast
Usual type ductal hyperplasia Columnar cell change Columnar cell Hyperplasia Flat epithelial atypia Atypical ductal hyperplasia Intraduct/ intracystic papillary lesions In situ lobular neoplasia
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Columnar Cell Hyperplasia
Flat Epithelial Atypia
Atypical Ductal Hyperplasia
CCC/CCH/ FEA/ADH These are not new lesions
They involve the terminal duct lobular units (TDLUs)
And were considered in the past as part of the fibrocystic change spectrum
They are now being singled out because they have chromosomal abnormalities indicating possible pre-cancerous potentials
Columnar Cell Change
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The simplest form of this group of lesions
and the one with least chromosomal abnormalities
Usually involves whole TDLUs
Which become cystic
Columnar Cell Change
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Columnar Cell Change Lined by one or
two layers of columnar epithelial cells, with uniform elongated nuclei, arranged perpendicular to the basement membrane.
Nucleoli are not obvious and mitotic figures are rare
The cells usually have apical snouts and the lumina contain flocculent material
Luminal calcification is common, and is usually the reason for the biopsy
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Columnar Cell Hyperplasia Dilated glands
lined by more than 2 layers of columnar cells,
with no atypia, i.e. the cells are arranged perpendicular to the basement membrane and have ovoid or elongated nuclei,
The proliferating cells may form mounds, tufts, or short micropapillae
Columnar Cell Hyperplasia
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By low power, TDLUs are usually bluer than usual
Glands are lined by 2 or more flat layers of cells showing low grade, monomorphic, cytologic atypia (resembling those seen in low grade DCIS)
Flat Epithelial Atypia
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Flat Epithelial Atypia
Nuclei are typically round, hyperchromatic, lack polarity, and may have prominent nucleoli
Apical snouts, luminal secretion and calcification are common
No complex architecture
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FEA
ADH
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Columnar Cell Change & Hyperplasia + Flat Epithelial atypia/ Immunohistochemistry
ER & PgR strongly positive
Cytokeratin 19 positive
Cytokeratin 5 & 14 negative
HER2 negative
ER
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CK5FEA
LG/ DCISADH
HUT
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ER FEA
ADH LG/DCIS
CCC+H
HUT
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Proliferative Epithelial Lesions of the Breast
Usual type ductal hyperplasia Columnar cell change Columnar cell Hyperplasia Flat epithelial atypia Atypical ductal hyperplasia Intraductal/ intracystic papillary lesions In situ lobular neoplasia
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Papillary lesionsI. Benign• Benign intraduct papilloma• Multiple intraduct papillomas• Intraduct papilloma with focal usual type hyperplasia
II. Atypical• Intraduct papilloma with focal atypical hyperplasia (atypical
intraduct papilloma)• Intraduct papilloma with focal DCIS
III. Malignant• Papillary DCIS• Intracystic (encapsulated) papillary carcinoma• Solid papillary carcinoma*
*Collins LC, Schnitt SJ. Histopathology 2008, 52,20-29
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Papillary lesionsI. Benign• Benign intraduct papilloma• Multiple intraduct papillomas• Intraduct papilloma with focal usual type hyperplasia
II. Atypical• Intraduct papilloma with focal atypical hyperplasia (atypical
intraduct papilloma)• Intraduct papilloma with focal DCIS
III. Malignant• Papillary DCIS• Intracystic (encapsulated) papillary carcinoma• Solid papillary carcinoma*
*Collins LC, Schnitt SJ. Histopathology 2008, 52,20-29
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1. Benign Intraduct Papilloma
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Benign Intraduct Papilloma Fronds covered by 2
layers of cells: luminal and myoepithelial
Myoepithelial cells surround the dilated duct
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Benign Intraduct Papilloma
SMA
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2. Multiple Benign intraduct papillomas*
*5 or more
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3. Intraduct papilloma with focal usual type hyperplasia
The fronds are covered by more than 2 layers of epithelial cells
With no atypia
*Page DL et al. Cancer 1996,78: 258-266
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Intraduct papilloma with focal usual type hyperplasia
CK 5 (& ER) will show 2 populations of cells: negative and positive
CK 5
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Papillary lesionsI. Benign• Benign intraduct papilloma• Multiple intraduct papillomas• Intraduct papilloma with focal usual type hyperplasia
II. Atypical• Intraduct papilloma with focal atypical hyperplasia (atypical
intraduct papilloma)• Intraduct papilloma with focal DCIS
III. Malignant• Papillary DCIS• Intracystic (encapsulated) papillary carcinoma• Solid papillary carcinoma*
*Collins LC, Schnitt SJ. Histopathology 2008, 52,20-29
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4. Intraduct papilloma with focal
atypical hyperplasia
atypical cells occupy an area less than 3mm
Atypical cells are relatively large with abundant cytoplasm and large uniform nuclei
Cells are CK 5 negative, ER positive
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Atypical cells occupy an area larger than 3mm
5. Intraduct papilloma with focal DCIS
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Papillary lesionsI. Benign• Benign intraduct papilloma• Multiple intraduct papillomas• Intraduct papilloma with focal usual type hyperplasia
II. Atypical• Intraduct papilloma with focal atypical hyperplasia (atypical
intraduct papilloma)• Intraduct papilloma with focal DCIS
III. Malignant• Papillary DCIS• Intracystic (encapsulated) papillary carcinoma• Solid papillary carcinoma*
*Collins LC, Schnitt SJ. Histopathology 2008, 52,20-29
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6. Papillary DCIS
CK5/6
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7. Intracystic (encapsulated) papillary carcinoma well-defined lesions
consisting entirely of malignant cells covering papillary fronds, with no underlying myoepithelial cells,
developing in an apparently dilated , usually subareolar, duct ,
surrounded by a thick fibrous capsule
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Case No. 152:F 64y, Left Breast, Cystic Lump
Intracystic (encapsulated) papillary carcinoma/ IH
K5 SMA
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Intracystic (encapsulated) papillary carcinoma
There may be no myoepithethelial cells around the lesion
Thus, the lesion may be in fact a form of low grade invasive carcinoma with an expansile growth pattern
Or part of progression from in situ to invasive carcinoma
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Intracystic (encapsulated) papillary carcinoma
The lesion may be associated with foci of DCIS or frankly invasive carcinoma
In the latter case, Collins & Schnitt recommend considering only the size of the frankly invasive component for staging purposes
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8. Solid Papillary carcinoma
Circumscribed solid nodule
May be associated with adjacent foci of in situ or invasive carcinoma
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Solid Papillary carcinoma
Discrete papillae are not present,
but the underlying papillary structure is represented by a network of fibrovascular cores among the solid epithelial proliferation
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Solid Papillary carcinoma
There are no myoepithelial cells within the lesion
And myoepithelial cells may be also lacking around the lesion in some cases,
raising the possibility, as in intracystic papillary lesions, that at least some of these cases also represent low grade expansile invasive cancers CK 5
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Proliferative Epithelial Lesions of the Breast
Usual type ductal hyperplasia Columnar cell change & Hyperplasia Flat epithelial atypia Atypical ductal hyperplasia Intraduct/ intracystic papillary lesions In situ lobular neoplasia
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In Situ Lobular Neoplasia (Atypical Lobular Hyperplasia (ALH)/ Lobular Carcinoma in Situ (LCIS)
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1. (Incidental) In Situ Lobular Neoplasia
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Extensive classic LCIS
E-Cadherin
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Pleomorphic LCIS
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Pleomorphic LCIS/ E-Cadherin
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Mixed LCIS
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In Situ Lobular Neoplasia in core biopsies
Extensive LCIS
Pleomorphic LCIS Mixed LCIS
B3 B5a
B5a (If no invasive elements are present) B5a