Prognostic impact of the cancer Stem cell-related marker NANOG in ovarian serous carcinoma

Maria Lee, Eun Ji Nam, Sang Wun Kim, Sunghoon Kim, Jae Hoon Kim, Young Tae Kim

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51 Citations (Scopus)


Objective: The objective of this study was to evaluate the prognostic significance of NANOG expression in ovarian serous carcinoma. Methods: The expression of NANOG was evaluated in 6 ovarian carcinoma cell lines, paclitaxel-resistant SKOV3 cells, and SKOV3 spheroid cells with semiquantitative reverse transcription-polymerase chain reaction and Western blotting. NANOG expression was also measured immunohistochemically in a tissue microarray containing ovarian tissues from 74 patients with ovarian serous carcinoma and 24 with ovarian serous cystadenoma. Each sample was scored based on signal intensity and proportion, and a score greater than 4 was considered "positive." Results: NANOG mRNA expression was variable in different ovarian cancer cell lines. The mRNA level of NANOG was increased in the paclitaxel-resistant SKOV3 cells and SKOV3 spheroid cells compared with that in the SKOV3 cells. NANOG expression was positive in 21.6% of 74 ovarian serous carcinoma tissues, but none of the ovarian serous cystadenoma tissues were positive. Positive NANOG expression was associated with residual tumor size after surgery (P = 0.032). The overall survival of the patients with positive NANOG expression was poorer than that of the patients with negative NANOG expression (P = 0.020). In patients with stage I and II disease, positive NANOG expression was independently associated with shorter overall survival compared with negative NANOG expression (40 vs 120 months, respectively; P = 0.031). Conclusions: Positive NANOG expression is associated with poor prognosis of ovarian serous carcinoma. NANOG has potential as a predictor of survival for patients with ovarian carcinomas and may be involved in the mechanism of chemoresistance.

Original languageEnglish
Pages (from-to)1489-1496
Number of pages8
JournalInternational Journal of Gynecological Cancer
Issue number9
Publication statusPublished - 2012 Nov

All Science Journal Classification (ASJC) codes

  • Oncology
  • Obstetrics and Gynaecology


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