Eribulin in the treatment of advanced breast cancer: real-world scenario from 39 Italian centers

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Research Article

Eribulin in the treatment of advanced breast cancer: real-world scenario from 39 Italian centers – ESEMPiO study Sandro Barni*,1 , Luca Livraghi2 , Maria Morritti3 , Patrizia Vici4 , Andrea Michelotti5 , Saverio Cinieri6 , Caterina Fontanella7 , Luca Porcu8 , Lucia Del Mastro9 & Fabio Puglisi7,10 1

Oncology Unit, Medical Department, ASST Bergamo Ovest, 24047, Treviglio, Italy Medical Oncology Unit, ASST Papa Giovanni XXIII, 24127, Bergamo, Italy 3 Oncology Unit, Ospedale Casa Sollievo della Sofferenza, 71013, San Giovanni Rotondo, Foggia, Italy 4 Division of Medical Oncology 2, ”Regina Elena” National Cancer Institute, 00128, Rome, Italy 5 Oncology Unit 1, Azienda Ospedaliera Universitaria Pisana, 56126, Pisa, Italy 6 Medical Oncology Division and Breast Unit, ”Senatore Antonio Perrino” Hospital, 72100, Brindisi, Italy 7 Unit of Medical Oncology and Cancer Prevention, IRCCS Centro di Riferimento Oncologico Aviano-National Cancer Institute, 33081, Aviano, Italy 8 Laboratory of Methodology for Clinical Research, Oncology Department, IRCCS – Istituto di Ricerche Farmacologiche Mario Negri, 20156, Milan, Italy 9 Department of Internal Medicine, University of Genova, Ospedale Policlinico San Martino, 16132, Genoa, Italy 10 Medical Oncology, Department of Medicine, University of Udine, 33100, Udine, Italy *Author for correspondence: Tel.: +39 0363 424223; Fax: +39 0363 424380; sandro barni@asst-bgovest.it 2

Aim: We performed a multicenter retrospective cohort study of eribulin mesylate (EM) use in Italy, to describe the current practice for metastatic breast cancer patients (ESEMPiO) in the real-world. Patients & methods: Baseline characteristics, treatment administration and safety were summarized using descriptive statistics. Results: No safety concerns were raised in the population enrolled in the ESEMPiO database and treated in a real-life practice. Median progression-free survival and overall survival were 3.2 and 10.1 months, respectively. EM activity was similar between breast cancer subtypes. Conclusion: In metastatic breast cancer patients treated with EM in ‘real-world’ setting, the clinician-registered outcomes were comparable to those reported in pivotal trials. Furthermore, EM maintained clinical activity and a tolerable safety profile. First draft submitted: 23 April 2018; Accepted for publication: 27 September 2018; Published online: 9 November 2018 Keywords: database • eribulin mesylate • metastatic breast cancer • real-world • safety

Breast cancer is the most common malignancy and the leading cause of cancer mortality in women worldwide [1]. The scenario of available drugs for treatment of metastatic breast cancer (MBC) is continuously expanding. Eribulin mesylate (EM) is a structurally simplified synthetic analog of halichondrin B, which is a natural product isolated from the marine sponge Halichondria okadai. It interferes with microtubule dynamics by suppressing the growth phase of microtubules, thus differing from other tubulin-targeting drugs (e.g., taxanes and vinca alkaloids). Indeed, EM prevents the formation of mitotic spindle, irreversibly blocks the cell cycle in the G2-M phase and induces apoptosis [2–5]. In the EMBRACE trial, treatment with EM conferred a significant survival advantage compared with treatment of physician’s choice (TPC), with a manageable toxicity profile [6]. Based on this study, in 2011 the EMA initially approved EM on the treatment of patients with locally advanced or MBC who have progressed after at least two chemotherapeutic regimens for advanced disease (prior therapy should have included an anthracycline and a taxane unless patients were not suitable for these treatments). In 2014, the EMA approved the use of EM also in second-line setting, based on results from another randomized Phase III study [7]. Although patients enrolled in clinical trials usually differ from patients treated in the community setting, the latter usually being of older age and having worse performance status and more co-morbidities [8,9], in daily clinical

C 2018 Future Medicine Ltd 10.2217/fon-2018-0324 �

Future Oncol. (2019) 15(1), 33–44

ISSN 1479-6694

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