Efficacy and safety of anlotinib in advanced soft tissue sarcoma: results from one of multi-centers in a phase IIB trial (ALTER0203).

Abstract

e22518 Background: There is no standard therapy for soft tissue sarcoma (STS) patients progressing after first-line chemotherapy. Anlotinib significantly prolonged PFS in advanced STS patients in the earlier results of ALTER0203. In view of regional differences, we further analysis results from Affiliated Sixth People’s Hospital, Shanghai Jiaotong University, one center in this IIB trial. Methods: Patients aged from 18 to 70 with advanced STS, progressing after anthracycline-based chemotherapy (not adapted to alveolar soft part sarcoma (ASPS) and clear cell sarcoma (CSC)), angiogenesis inhibitor naive, at least one measurable lesion according to RECIST 1.1, were eligible. Patients were randomised in a 2:1 ratio to receive anlotinib (12 mg per day 2 weeks on and 1 week off) or placebo. Primary endpoint was progression free survival (PFS). Secondary endpoints were overall response rate (ORR), disease control rate (DCR). Results: This center of ALTER0203 enrolled 48 eligible patients who received either anlotinib (n = 32) or placebo (n = 16). Leiomyosarcoma (LMS) (13/48), ASPS (12/48), synovial sarcoma (SS) (11/48) were major subtypes. The median PFS was 1.57 months (95% CI: 1.19-1.95) for placebo versus 6.27 months (95% CI: 1.89-10.65) for anlotinib ( P= 0.009). ORR was 0% (0/16) for placebo versus 18.75% (6/32) for anlotinib ( P= 0.16); DCR was 18.75% (3/16) for placebo versus 56.25% (18/32) for anlotinib ( P= 0.02). The most common adverse events (AEs) were hypertension, elevated TSH, hypertriglyceridaemia (HTG). The most common Grade ≥3 AEs were menstrual disorder, hypertension, gamma glutamyl transferase (GGT) elevation and lipase elevation. Conclusions: The efficacy and safety of anlotinib is further confirmed in advanced STS patients regarding regional differences. Clinical trial information: NCT02449343. [Table: see text]