Class III β-tubulin overexpression within the tumor microenvironment is a prognostic biomarker for poor overall survival in ovarian cancer patients treated with neoadjuvant carboplatin/paclitaxel

Dana M. Roque, Natalia Buza, Michelle Glasgow, Stefania Bellone, Ileana Bortolomai, Sara Gasparrini, Emiliano Cocco, Elena Ratner, Dan Arin Silasi, Masoud Azodi, Thomas J. Rutherford, Peter E. Schwartz, Alessandro D. Santin

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Critics have suggested that neoadjuvant chemotherapy (NACT) followed by interval debulking may select for resistant clones or cancer stem cells when compared to primary cytoreduction. β-tubulins are chemotherapeutic targets of taxanes and epothilones. Class III β-tubulin overexpression has been linked to chemoresistance and hypoxia. Herein, we describe changes in class III β-tubulin in patients with advanced ovarian carcinoma in response to NACT, in relationship to clinical outcome, and between patients who underwent NACT versus primary debulking; we characterize in vitro chemosensitivity to paclitaxel/patupilone of cell lines established from this patient population, and class III β-tubulin expression following repeated exposure to paclitaxel. Using immunohistochemistry, we observed among 22 paired specimens obtained before/after NACT decreased expression of class III β-tubulin following therapy within stroma (p = 0.07), but not tumor (p = 0.63). Poor median overall survival was predicted by high levels of class III β-tubulin in both tumor (HR 3.66 [1.11,12.05], p = 0.03) and stroma (HR 4.53 [1.28,16.1], p = 0.02). Class III β-tubulin expression by quantitative-real-time- polymerase-chain-reaction was higher among patients who received NACT (n = 12) compared to primary cytoreduction (n = 14) (mean ± SD fold-change: 491.2 ± 115.9 vs. 224.1 ± 55.66, p = 0.037). In vitro subculture with paclitaxel resulted in class III β-tubulin upregulation, however, cell lines that overexpressed class III β-tubulin remained sensitive to patupilone. Overexpression of class III β-tubulin in patients dispositioned to NACT may thus identify an intrinsically aggressive phenotype, and predict poor overall survival and paclitaxel resistance. Decreases in stromal expression may represent normalization of the tumor microenvironment following therapy. Epothilones warrant study for patients who have received neoadjuvant carboplatin and paclitaxel.

Original languageEnglish (US)
Pages (from-to)101-110
Number of pages10
JournalClinical and Experimental Metastasis
Volume31
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Epothilone
  • Neoadjuvant chemotherapy
  • Ovarian cancer
  • Paclitaxel resistance
  • Tubulin

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