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BMC Cancer
Published in: BMC Cancer 1/2013

Open Access 01-12-2013 | Research article

Napsin A as a marker of clear cell ovarian carcinoma

Authors: Ingiridur Skirnisdottir, Kathrine Bjersand, Helena Åkerud, Tomas Seidal

Published in: BMC Cancer | Issue 1/2013

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Abstract

Background

Clear cell carcinomas are aggressive tumors with a distinct biologic behaviour. In a genome-wide screening for genes involved in chemo-resistance, NAPA was over-expressed in cisplatin-resistant cells. The NAPA (protein) Napsin A was described to promote resistance to cisplatin by degradation of the tumor suppressor p53.

Methods

Totally 131 patients were included in this study all in FIGO-stages I-II; 16 were clear cell tumors which were compared with 40 Type I tumors and 75 type II tumors according to the markers Napsin A, p21, p53 and p27 and some clinical features. For detection of the markers tissue microarrays and immunohistochemistry were used.

Results

Positivity for Napsin A was detected in 12 (80%) out of the 15 clear cell tumors available for analysis compared with 3 (4%) out of the Type I and II tumors in one group (p < 0.001). Differences in p21 status, p53 status, and p21 + p53- status were striking when clear cell tumors were compared with Type I, Type II, and Type I and II tumors in one group, respectively. The p21 + p53-status was associated to positive staining of Napsin A (p = 0.0015) and clear cell morphology (p = 0.0003). In two separate multivariate logistic regression analyses with Napsin A as endpoint both clear cell carcinoma with OR = 153 (95% C.I. 21–1107); (p < 001) and p21 + p53- status with OR = 5.36 (95% C.I. 1.6-17.5); (p = 0.005) were independent predictive factors. ROC curves showed that AUC for Napsin A alone was 0.882, for p21 + p53- it was 0.720 and for p21 + p53-Napsin A + AUC was 0.795. Patients with clear cell tumors had lower (p = 0.013) BMI than Type I patients and were younger (p = 0.046) at diagnosis than Type II patients. Clear cell tumors had a higher frequency (p = 0.039) of capsule rupture at surgery than Type I and II tumors.

Conclusions

Positivity of Napsin A in an epithelial ovarian tumor might strengthen the morphological diagnosis of clear cell ovarian carcinoma in the process of differential diagnosis between clear cell ovarian tumors and other histological subtypes.
Appendix
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Metadata
Title
Napsin A as a marker of clear cell ovarian carcinoma
Authors
Ingiridur Skirnisdottir
Kathrine Bjersand
Helena Åkerud
Tomas Seidal
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2013
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-13-524

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