Predictive signi cance of DNA damage and repair biomarkers in triple-negative breast cancer patients treated with neoadjuvant chemotherapy: An exploratory analysis

Ruggero De Maria Marchiano, Daniele Sergi, Annalisa Fabi, Teresa Gamucci, Patrizia Vici, Anna Di Benedetto, Cristiana Ercolani, Laura Pizzuti, Luigi Di Lauro, Domenico Sergi, Francesca Sperati, Irene Terrenato, Rosanna Dattilo, Claudio Botti, Alessandra Fabi, Maria Teresa Ramieri, Lucia Mentuccia, Camilla Marinelli, Laura Iezzi, Clara NatoliIlio Vitale, Maddalena Barba, Marcella Mottolese, Marcello Maugeri-Saccà

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

14 Citazioni (Scopus)

Abstract

Response of cancer cells to chemotherapy-induced DNA damage is regulated by the ATM-Chk2 and ATR-Chk1 pathways. We investigated the association between phosphorylated H2AX (γ-H2AX), a marker of DNA double-strand breaks that trigger the ATM-Chk2 cascade, and phosphorylated Chk1 (pChk1), with pathological complete response (pCR) in triple-negative breast cancer (TNBC) patients treated with neoadjuvant chemotherapy. γ-H2AX and pChk1 were retrospectively assessed by immunohistochemistry in a series of pretreatment biopsies related to 66 patients. In fty-three tumors hormone receptor status was negative in both the diagnostic biopsies and residual cancers, whereas in 13 cases there was a slight hormone receptor expression that changed after chemotherapy. Internal validation was carried out. In the entire cohort elevated levels of γ-H2AX, but not pChk1, were associated with reduced pCR rate (p = 0.009). The association tested signi cant in both uni- and multivariate logistic regression models (OR 4.51, 95% CI: 1.39–14.66, p = 0.012, and OR 5.07, 95% CI: 1.28–20.09, p = 0.021, respectively). Internal validation supported the predictive value of the model. The predictive ability of γ-H2AX was further con rmed in the multivariate model after exclusion of tumors that underwent changes in hormone receptor status during chemotherapy (OR 7.07, 95% CI: 1.39–36.02, p = 0.018). Finally, in residual diseases a signi cant decrease of γ-H2AX levels was observed (p < 0.001). Overall, γ-H2AX showed ability to predict pCR in TNBC and deserves larger, prospective studies.
Lingua originaleEnglish
pagine (da-a)42773-42780
Numero di pagine8
RivistaOncotarget
DOI
Stato di pubblicazionePubblicato - 2015

Keywords

  • DNA damage and repair, triple-negative breast cancer, pathological complete response

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