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Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

Eble JN, Sauter G., Epstein JI, Sesterhenn IA - iarc

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A<br />

B<br />

Fig. 3.20 A, B Adenocarcinoma with mucinous fibroplasia (collagenous micronodules).<br />

A<br />

B<br />

Fig. 3.21 A Adenocarcinoma with perineural invasion. B Prostate cancer with glomerulations.<br />

spectrum and low molecular weight<br />

cytokeratins. However, only basal cells<br />

express high molecular weight cytokeratins<br />

{309}. One high molecular monoclonal<br />

cytokeratin antibody, clone<br />

34βE12, recognizes 57 and 66 kilodalton<br />

cytokeratins in stratum corneum corresponding<br />

to Moll numbers 1, 5, 10 and<br />

14, and is widely used as a basal cell<br />

specific marker active in paraffin-embedded<br />

tissue following proteolytic digestion<br />

{66,309,918,1048,1765,2374,2905}.<br />

34βE12 is also immunoreactive against<br />

squamous, urothelial, bronchial/pneumocyte,<br />

thymic, some intestinal and ductal<br />

epithelium (breast, pancreas, bile duct, salivary<br />

gland, sweat duct, renal collecting<br />

duct), and mesothelium {918}. An<br />

immunoperoxidase cocktail containing<br />

monoclonal antibodies to cytokeratins 5 and<br />

6 is also an effective basal cell stain {1286}.<br />

Since uniform absence of a basal cell<br />

layer in prostatic acinar proliferations is<br />

one important diagnostic feature of invasive<br />

carcinoma and basal cells may be<br />

inapparent by H&E stain, basal cell specific<br />

immunostains may help to distinguish<br />

invasive prostatic adenocarcinoma<br />

from benign small acinar cancer - mimics<br />

which retain their basal cell layer, e.g.<br />

glandular atrophy, post-atrophic hyperplasia,<br />

adenosis (atypical adenomatous<br />

hyperplasia), sclerosing adenosis and<br />

radiation induced atypia {66,1048,2905}.<br />

Because the basal cell layer may be<br />

interrupted or not demonstrable in small<br />

numbers of benign glands, the complete<br />

absence of a basal cell layer in a small<br />

focus of acini cannot be used alone as a<br />

definitive criterion for malignancy; rather,<br />

absence of a basal cell layer is supportive<br />

of invasive carcinoma only in acinar<br />

proliferations which exhibit suspicious<br />

cytologic and / or architectural features<br />

on H&E stain {1048}. Conversely, some<br />

early invasive prostatic carcinomas, e.g.<br />

microinvasive carcinomas arising in<br />

association with or independent of high<br />

grade prostatic intraepithelial neoplasia,<br />

may have residual basal cells {1952}.<br />

Intraductal spread of invasive carcinoma<br />

and entrapped benign glands are other<br />

proposed explanations for residual basal<br />

cells {66,2905}. Rare prostatic adenocarcinomas<br />

contain sparse neoplastic glandular<br />

cells, which are immunoreactive for<br />

34βE12, yet these are not in a basal cell<br />

distribution {66,2374}. The use of antibodies<br />

for 34βE12 is especially helpful<br />

for the diagnosis for of deceptively<br />

benign appearing variants of prostate<br />

cancer. Immunohistochemistry for cytokeratins<br />

7 and 20 have a limited diagnostic<br />

use in prostate pathology with the<br />

exception that negative staining for both<br />

markers, which can occur in prostate<br />

Acinar adenocarcinoma 173

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