Objective: Pertuzumab, a new recombinant humanized monoclonal antibody, has been developed to inhibit the formation of HER2:HER3 heterodimerization. The clinical benefit of pertuzumab therapy in HER2 positive metastatic Breast Cancer (mBC) patients in the first-line setting has been shown in previous phase III studies. Herein we aimed to analyze the efficacy and toxicity profile of pertuzumab in patients with HER2 positive mBC.
Materials and Methods:This was a retrospective study of 28 patients with mBC followed from two different centers in Turkey. All patients were treated with pertuzumab in the first line setting, with a combination including trastuzumab and docetaxel. Treatment outcomes along with drug efficacy and safety were retrospectively analyzed. Results: At a median follow-up time of 10.1 (2.4-25.2) months, among the 28 patients, 1 (3.6%) case of death and 2 (7.1%) cases of progression occurred. The median age was determined as 47 (18-74) years. Excluding 1 patient, all had (96.4%) de-novo metastatic disease at presentation. The median number of treatment cycles was 7 (4 -12) for docetaxel, 18 (4 -35) for pertuzumab + trastuzumab, and 10 (1 -29) for the maintenance therapy (pertuzumab + trastuzumab). The most common side effects were fatigue (75%) and arthralgia/myalgia (64.3%). Grade 3 or 4 toxicity was observed to be very infrequent as follows: neutropenia; grade 3 in 4 (14%) patients and grade 4 in 1 (3.6%) patient, neuropathy; grade 3 in 5 (17.8%) patients. Conclusion: Even with a small sample size, our results confirm that pertuzumab + trastuzumab + docetaxel combination therapy in the first line setting for HER2 positive mBC patients is the standard of care, with acceptable toxicity profile.Key Words: Metastatic breast cancer, HER2 positive, pertuzumab, progression free survival, overall survival, toxicity ÖZET Amaç: Pertuzumab HER2:HER3 heterodimerizasyon oluşumunu inhibe eden, yeni geliştirilen bir rekombinant humanize monoklonal antikordur. Daha önce yapılan faz III çalışmalarda, HER2 pozitif metastatik Meme Kanseri (mMK) hastalarında pertuzumabın klinik faydası gösterilmiştir. Biz de bu çalışmada HER2 pozitif mMK'li hastalarda pertuzumabın etkinlik ve toksisite profilini analiz etmeyi amaçladık. Gereç ve Yöntemler: Çalışmamızda Türkiye'deki iki farklı merkezden takip edilen 28 mMK hastasının retrospektif verileri incelenmiştir. Tüm hastalar birinci basamakta pertuzumab ile tedavi edilmişti. İlaç etkinliği ve güvenliği ile birlikte tedavi sonuçları retrospektif olarak analiz edildi. Bulgular: Ortanca 10.1 (2.4-25.2) ay takip süresince, toplam 28 hastada, 1 (%3.6) ölüm vakası ve 2 (%7.1) progresyon vakası gerçekleşti. Ortanca yaş 47 (18-74) olarak saptandı. Bir hasta hariç, hastaların hepsi (%96.4) de-novo metastatikti. Ortanca kür sayıları; dosetaksel için 7 (4 -12), pertuzumab + trastuzumab için 18 (4 -35) ve idame pertuzumab + trastuzumab için 10 (1 -29) olarak saptandı. En sık görülen yan etkiler; yorgunluk (%75) ve artralji-myaljiydi (%64.3). Grade 3-4 yan etkiler çok nadir görülmekle birl...