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A Bottini Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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A Berruti Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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M P Brizzi Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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A Bersiga Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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D Generali Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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G Allevi Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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S Aguggini Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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G Bolsi Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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S Bonardi Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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B Tondelli Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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F Vana Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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M Tampellini Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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P Alquati Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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L Dogliotti Breast Unit and Anatomia Patologica Azienda Ospedaliera Istituti Ospitalieri, Cremona, Dipartimento di Scienze Cliniche e Biologiche, Universitàdi Torino, Oncologia Medica, Azienda Ospedaliera San Luigi, Orbassano, Italy

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This study was designed to address whether simultaneous primary chemo-hormonal therapy provides additional activity compared with chemotherapy alone in breast cancer patients with operable or locally advanced disease. Between January 1997 and January 2002, 211 consecutive patients with T2–4, N0–1, M0 breast cancer were randomized to receive either epirubicin alone (EPI) or epirubicin plus tamoxifen (EPI-TAM). Ki67 expression was evaluated immunohistochemically in tumor specimens obtained before chemotherapy by incision biopsy and at definitive surgery. Tumor shrinkage of >50% was obtained in 76% of patients randomized in the EPI arm and 81.9% of patients randomized in the EPI-TAM arm (not significant). The corresponding rates of clinical and pathological complete response were 20.2 and 21.9% (not significant), and 4.8 and 6.7% (not significant), respectively. Pathologically complete response was more frequently observed in estrogen receptor (ER)-negative (ER−) tumors (P=0.04) and correlated with elevated baseline Ki67 expression (P<0.01). Both EPI and EPI-TAM treatments resulted in a significant reduction in Ki67 expression, either in overall patients (P=0.000) or in patients with ER+ breast cancer (P=0.000). The reduction in Ki67 immunostaining in the EPI-TAM arm was greater than in the EPI arm, leading to a lower Ki67 expression at post-operative residual histology (P=0.0041). The addition of tamoxifen to epirubicin chemotherapy did not improve the response rate but led to a significantly higher reduction in the Ki67 expression. Baseline elevated Ki67 expression and the ER− status were both associated with a greater chance of obtaining a pathological complete response at residual histology.

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