Surufatinib combined with transarterial embolization versus surufatinib monotherapy in patients with liver metastatic neuroendocrine tumors: Study protocol for a prospective, randomized, controlled trial

Abstract Background More than half of neuroendocrine tumor (NET) patients will experience liver metastasis, and interventional therapy represented by transarterial embolization (TAE) is the main local treatment method. Surufatinib is recommended as a standard systemic treatment for advanced NETs. The efficacy and safety of surufatinib combined with TAE in the treatment of liver metastasis are undetermined. This study was conducted to compare the clinical outcome of surufatinib combined with TAE versus surufatinib monotherapy in liver metastatic NETs. Methods This is a prospective, multicenter, open‐label, and randomized controlled trial. Patients diagnosed with liver metastatic NETs will be enrolled. Participants are randomly assigned in a 1:1 ratio to either the experimental group or the control group. Patients will be treated with surufatinib plus TAE in the experimental group, while patients in the control group will receive surufatinib monotherapy. The primary endpoint is progression‐free survival (PFS) assessed by a blinded independent image review committee (BIIRC). The secondary endpoints are investigator‐assessed PFS, liver‐specific objective response rate (ORR), objective response rate (ORR), disease control rate (DCR), overall survival (OS), and incidence of adverse events. Discussion This is the first prospective study to investigate the efficacy of surufatinib combined with TAE. We expect this trial to propose a new and effective treatment strategy for liver metastatic NETs.