Update results of paclitaxel and cisplatin in combination with anlotinib as first-line regimen for advanced esophageal squamous cell carcinoma (ESCC): A multicenter, single-arm, open-label phase Ⅱ clinical trial.

Abstract

181 Background: The prognosis of pts with advanced ESCC remains dismal clinically. Paclitaxel and cisplatin were used as the standard first-line regimen in ESCC for almost two decades. As a novel multitarget tyrosine kinase inhibitor mainly targeting antiangiogenic single pathway, anlotinib was demonstrated to be an effective second-line monotherapy for pts with advanced or recurrent ESCC in China. Consequently, the aim of this study was to investigate the efficacy and toxicity of paclitaxel and cisplatin combined with anlotinib as first-line therapy for advanced ESCC. Methods: Pts with previously untreated metastatic or unresectable, locally advanced ESCC, who had not received (neo) adjuvant therapy/radical surgery within 6 months were recruited in this study. Eligible subjects were given paclitaxel (135mg/m2, iv, q3w) and cisplatin (60~75mg/m2, iv, d1~3, q3w) plus anlotinib (10mg, po, d1~14, q3w) for 4~6 cycles during initial therapy. For those without progressive disease, maintenance treatment was administrated with anlotinib monotherapy (10mg, po, d1~14, q3w) until progression or unacceptable toxicity. The tumor response was assessed by investigator according to RECIST version 1.1 using CT scans every two cycles. And the calculated sample size of this study was 47. The primary endpoint was PFS, secondary endpoints were safety, objective response rate (ORR), disease control rate (DCR) and duration of response (DOR). Results: From Oct 2019 to Aug 2020, 27 pts were available for efficacy and safety evaluation. In best overall response assessment, there were 7.4% CR (2/27), 66.7% PR (18/27) and 25.9% SD (7/27). ORR was 74.1% (95%CI: 53.7. ~ 88.9), and DCR was 100.0% (95%CI: 87.2~100.0). The median PFS of the 27 pts was not yet available. The safety profile indicated that the most common drug-related adverse events were myelosuppression, gastrointestinal reaction, fatigue, hypertension, constipation, hypokalemia and hepatotoxicity. The common grade 3-4 treatment-related adverse events were myelosuppression (18.5%), hypertension (7.4%). Conclusions: The current results indicated that paclitaxel and cisplatin combined with anlotinib as first line therapy for advanced ESCC exhibited encouraging efficacy and manageable adverse events. The conclusion should be validated in more pts consecutively. Clinical trial information: NCT04063683. [Table: see text]