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- W4361817728 abstract "<div>Abstract<p>Neoadjuvant radio/chemotherapy regimens can markedly improve cervical cancer outcome in a subset of patients, while other patients show poor responses, but may encounter severe adverse effects. Thus, there is a strong need for predictive biomarkers to improve clinical management of cervical cancer patients. STAT3 is considered as a critical antiapoptotic factor in various malignancies. We therefore investigated STAT3 activation during cervical carcinogenesis and its impact on the response of cervical cancer cells to chemotherapeutic drugs. Tyr705-phosphorylated STAT3 increased from low-grade cervical intraepithelial neoplasia (CIN1) to precancerous CIN3 lesions. Notably, pTyr705-STAT3 activation significantly declined from CIN3 to invasive cancer, also when compared in the same clinical biopsy. pTyr705-STAT3 was also low or absent in cultured human cervical cancer cell lines, consistent with the <i>in vivo</i> expression data. Unexpectedly, IL6-type cytokine signaling inducing STAT3 activation rendered cervical cancer cells significantly more susceptible to chemotherapeutic drugs, that is, cisplatin or etoposide. This chemosensitization was STAT3-dependent and we identified IFN regulatory factor-1 (IRF1) as the STAT3-inducible mediator required for cell death enhancement. In line with these data, pTyr705-STAT3 significantly correlated with nuclear IRF1 expression in cervical cancer <i>in vivo</i>. Importantly, high IRF1 expression in pretreatment cervical cancer biopsy cells was associated with a significantly better response to neoadjuvant radio/chemotherapy of the patients. In summary, our study has identified a key role of the STAT3/IRF1 pathway for chemosensitization in cervical cancer. Our results suggest that pretherapeutic IRF1 expression should be evaluated as a novel predictive biomarker for neoadjuvant radio/chemotherapy responses. <i>Cancer Res; 76(13); 3872–83. ©2016 AACR</i>.</p></div>" @default.
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- W4361817728 date "2023-03-30" @default.
- W4361817728 modified "2023-10-04" @default.
- W4361817728 title "Data from STAT3/IRF1 Pathway Activation Sensitizes Cervical Cancer Cells to Chemotherapeutic Drugs" @default.
- W4361817728 doi "https://doi.org/10.1158/0008-5472.c.6507872.v1" @default.
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