Abstract
e14604 Background: Nimotuzumab is a genetically engineered humanized antibody (mAb) that recognizes an epitope located in the extracellular domain of human EGFR. Evidences have shown that nimotuzumab is effective and safe in SCCHN. The combination of paclitaxel/cisplatin (TP) is a standard regimen for advanced or metastatic ESCC. This open uncontrolled phase II study was designed to determine the efficacy and safety of nimotuzumab in combination with TP as the first-line treatment in advanced ESCC. Methods: All patients have histology/cytology confirmed advanced or metastatic ESCC with ECOG PS 0-2. The treatment plan is as the following: paclitaxel administered intravenously (IV) 175 mg/m2 on d1 and cisplatin IV 30-35mg/ m2/d on d1-2, every 21 days for 6 cycles, and nimotuzumab IV 200mg weekly. For patients with stable disease (SD) and better, nimotuzumab will be given continuously after 6 cycles of TP. The primary endpoint is objective response rate (RR) with 56 patients enrollment (target RR >60%); secondary endpoints were progression-free survival (PFS), overall survival (OS) and safety/ tolerability. The coordinations between EGFR and ERCC1 with response of treatment will be analyzed. Results: Up to date, 25 patients (male/female, 20/5; median age 58) have been enrolled. All patients were evaluated for toxicity and 22 are evaluable for response. 14 (63.6%) had a confirmed partial response (PR) and 7 (31.8%) had SD as their best responses with disease control rate of 95.4%. Only one patient had progressive disease (PD). Grade 3 or 4 neutropenia, neutropenic fever and anemia occurred in 52.2%, 4% and 13% respectively. Nonhematological toxicities were generally mild with grade 1 or 2 alopecie, hypodynamia, anorexia, nausea, arthralgia, and itch of skin occurring in 80%, 60.9%, 43.5%, 34.8%, 30.4%, and 21.7%. One patient had a grade 3 haematuria. Conclusions: The interim analysis showed that the combination of nimotuzumab with TP is tolerated reasonably well in patients with advanced or metastatic ESCC and encouraging efficacy. The study is ongoing with coordination of biomarkers and response as well.
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