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Invasive breast carcinoma - IARC

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Fig. 2.50 Borderline Brenner tumour. A large, papillary,<br />

polypoid component protrudes into a cystic<br />

space.<br />

Macroscopy<br />

Transitional cell <strong>carcinoma</strong>s are bilateral<br />

in approximately 15% of cases {139} and<br />

a re macroscopically indistinguishable<br />

f rom other surface epithelial-stro m a l<br />

tumours {139,2676}.<br />

Tumour spread and staging<br />

At the time of diagnosis transitional cell<br />

c a rcinomas have spread beyond the<br />

ovary in over two-thirds of cases {2676}<br />

Histopathology<br />

Transitional cell <strong>carcinoma</strong>s re s e m b l e<br />

those occurring in the urinary tract and<br />

lack a benign or borderline Bre n n e r<br />

tumour component {139,2676}. Typically,<br />

they are papillary with multilayered transitional<br />

epithelium and a smooth luminal<br />

border ("papillary type"). A nested pattern<br />

characterized by malignant transitional<br />

cell nests irregularly distributed in<br />

fibrotic stroma ("malignant Brenner-like<br />

type") has been described {2464,2465}.<br />

As in urothelial <strong>carcinoma</strong>, foci of glandular<br />

and/or squamous diff e re n t i a t i o n<br />

may occur. Very commonly, transitional<br />

cell <strong>carcinoma</strong> is admixed with other<br />

epithelial cell types, primarily sero u s<br />

adeno<strong>carcinoma</strong>. Transitional cell <strong>carcinoma</strong>s<br />

lack the prominent stromal calcification<br />

characteristic of some benign and<br />

malignant Brenner tumours.<br />

Grading<br />

Transitional cell <strong>carcinoma</strong>s should be<br />

graded utilizing criteria for transitional<br />

cell <strong>carcinoma</strong> of the urinary tract.<br />

A<br />

Histogenesis<br />

The term transitional cell <strong>carcinoma</strong> is<br />

not uniformly accepted, and overlapping<br />

f e a t u res with other epithelial-stro m a l<br />

tumours, particularly serous <strong>carcinoma</strong>,<br />

are present. It is important that strict histological<br />

criteria be applied to establish<br />

the diagnosis {2465}. Not only an architectural<br />

but also a histological resemblance<br />

to transitional epithelium is<br />

required. The frequent association with<br />

epithelial-stromal tumours of other types<br />

strongly suggests a surface epithelial origin<br />

{2465}. In addition, several immunohistochemical<br />

studies have demonstrated<br />

that the tumour lacks a urothelial phenotype<br />

{2115,2371}. Thus, the ovarian<br />

neoplasm shows histological but not<br />

immunohistochemical similarities to transitional<br />

cell <strong>carcinoma</strong> of the urinary<br />

bladder.<br />

Prognosis and predictive factors<br />

The overall 5-year survival rate for transitional<br />

cell <strong>carcinoma</strong> is 35%. Some, but<br />

not all, investigators have re p o rt e d<br />

greater chemosensitivity and higher 5-<br />

year survival in patients whose metastases<br />

are composed purely or predominantly<br />

of transitional cell <strong>carcinoma</strong> {564,<br />

1232,2676}.<br />

Immunoprofile<br />

Ovarian transitional cell <strong>carcinoma</strong>s have<br />

an immunoprofile that differs from transitional<br />

cell <strong>carcinoma</strong>s of the urinary tract<br />

and closely resembles that of ovarian<br />

s u rface epithelial-stromal tumours.<br />

Ovarian transitional cell <strong>carcinoma</strong>s are<br />

consistently uroplakin, thrombomodulin<br />

and cyokeratin 13 and 20 negative and<br />

CA125 and cytokeratin 7 positive {2115,<br />

2371}.<br />

B<br />

Fig. 2.51 Borderline Brenner tumour (proliferating Brenner tumour). A Complex undulating and papillary<br />

transitional cell epithelium protrudes into a cystic space. B The transitional epithelium is thick with low<br />

grade cytological features.<br />

Surface epithelial-stromal tumours 141

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