Abstract P5-21-29: Moving from the CLEOPATRA study to real life: Preliminary results from the G.O.N.O. SUPER trial

Background: Around 20% of breast cancers (BC) are HER-2+. Trastuzumab (T) has dramatically changed the outcome of HER-2+ BC patients (pts), both in early and in advanced settings. The combination of Pertuzumab (P) plus T and docetaxel, used as first-line treatment for HER-2+ metastatic BC (MBC) in the phase III CLEOPATRA study, significantly prolonged progression free survival (PFS) and overall survival (OS). In order to verify the results of the Cleopatra trial in unselected pts, we performed a multicenter, retrospective-prospective, observational study, in HER-2+ MBC pts candidate to receive first line therapy with P plus T plus taxanes. Methods: We analyze the outcome of all HER-2+ MBC pts treated with P+T and taxanes, as first line therapy since the availability of P in Italy (2013), at 13 general and university hospitals. Results: Until June 6th data from 217 HER-2+ MBC pts were recorded. Main pts' characteristics were: median age 54 y (28-80), median ECOG PS 0 (0-2), hormonal receptor positive 152 pts (70%), 60 pts (27.6%) received neo/adjuvant chemotherapy (CT) + T and 75 pts (34.5%) adjuvant endocrine therapy. Most common metastatic sites: bone 121 pts (55.7%), liver 85 pts (39.2%), lung 61 pts (28.1%), soft tissues 133 pts (61.3%); 8 pts had CNS involvement. Seventy-eight pts (35.9%) had bone and/or soft tissues disease only; 108 pts (49.7%) had metastatic disease on presentation. Median number of metastatic sites was 3 (1-8). 144 pts (66.3%) and 72 pts (33.2%) received docetaxel (D) and paclitaxel (P) respectively. Median number of CT cycles was 6 for both drugs (D range 1-13; P range 1-18). Up to now 23 pts are still on CT and 86 on maintenance; ORR in evaluated pts (189) is 80.9% (47 and 106 pts obtained CR and PR respectively), 11 pts experienced PD during CT; 113 pts (58.2%) received endocrine therapy during maintenance.Median PFS is 14.7+ months (0.3+ - 53.2+). Most common adverse events are reported in table 1 Table 1Adverse EventAll grades N (%)Grade 3-4 N (%)Leukopenia39 (18)10 (4.6)Neutropenia42 (19.3)16 (7.3)Anemia50 (23)2 (0.9)Febrile Neutropenia7 (3.2) Diarrhea103 (47.4)10 (4.6)Asthenia127 (58.5)5 (2.3)Peripheral Neuropathy80 (36.8)3 (1.3)Stomatitis67 (30.8)2 (0.9) Nail changes, nausea, alopecia, rash and arthro-myalgia were also reported. Three pts interrupted CT due to symptomatic drop of left ventricular ejection fraction (LVEF); 2 pts interrupted maintenance P due to rash and dyspnea respectively, 16 stopped P and T due to drop in LVEF, 1 due to occurrence of ALL and 1 refused to continue. Conclusions: Our preliminary results highlight the activity and safety of the combination of CT plus P and T in unselected HER-2+ MBC patients. The study is ongoing and updated results will be presented. Citation Format: Garrone O, D'Onofrio L, Blondeaux E, Bertolini I, Giarratano T, Beano A, Saggia C, Cazzaniga M, LaVerde N, Collovà E, Milani A, De Conciliis E, Coltelli L, Airoldi M, Del Mastro L, Cursano MC, Michelotti A, Vandone AM, Guarneri V, Donadio M, Riva F, Nuzzo A, Merlano MC. Moving from the CLEOPATRA study to real life: Preliminary results from the G.O.N.O. SUPER trial [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P5-21-29.