Transarterial embolization (TAE) is equally effective and slightly safer than transarterial chemoembolization (TACE) to manage liver metastases in neuroendocrine tumors

Liver metastases from neuroendocrine tumor (NET) can be treated by transarterial embolization (TAE) or transarterial chemoembolization (TACE). The goal of TAE and TACE is to reduce blood flow to the tumor resulting in tumor ischemia and necrosis. In this retrospective study, the effectiveness and safety of TAE-TACE in the treatment of liver metastases in patients with NET was compared. Thirty patients with a histologically confirmed gastro-entero-pancreatic NET with liver metastases were retrospectively investigated. Seventeen patients underwent TAE, while 13 patients underwent TACE. Tumor response, degree of devascularization in treated lesions, and progression free survival (PFS) were evaluated in the whole population and then separately in TAE and TACE subgroups. In all patients treated with TAE and TACE, there was a significant size reduction of lesions as compared to baseline. Per lesion reduction was 2.2 ± 1.4 versus 3.3 ± 1.5 cm for TAE (p < 0.001) and 2.2 ± 1.5 versus 3.4 ± 1.7 cm for TACE (p < 0.001). In the whole population, the median PFS for all patients was 36 months (16.2-55.7 CI), without significant difference between TAE and TACE. In no patient did adverse events grade 3 and 4 as well as TAE/TACE-related death occurred, while the post-embolization syndrome occurred in 41 % of patients treated with TAE and 61 % of those treated with TACE. TAE and TACE are both effective in NET patients with liver metastases. TAE should be preferred to TACE in light of its similar anti-tumor effects and slightly better toxicity profile

Hepatic arterial embolization in patients with neuroendocrine tumors

Liver metastases occur in 46-93% of patients with neuroendocrine neoplasms (NENs). Presence and extension of liver metastases are considered important prognostic factors, as they may significantly impair the patient's quality of life, because of either tumor bulk or hormonal hypersecretion. Therapies for NEN liver metastases include surgical resection, liver transplantation, chemotherapy and biotherapy. Surgery is the gold standard for curative therapy, but in most of NEN patients with liver metastases, when surgery can not be applied, minimally invasive therapeutic approaches are adopted. They include trans-arterial embolization (TAE), trans-arterial chemoembolization (TACE), radiofrequency thermal ablation and new emerging techniques.TAE is based on selective infusion of particles in the branch of the hepatic artery supplying the tumor lesions. The goal of TAE is to occlude tumor blood vessels resulting in ischemia and necrosis. Many reports have shown that TAE can reduce tumor size and hormone output, resulting in palliation of symptoms without the use of cytotoxic drugs, resulting in better tolerability. This review will focus on TAE performance and safety in NEN patients with liver metastases