Efficacy of sorafenib in symptomatic patients with pretreated progressive desmoid tumors.

Abstract

e23556 Background: Desmoid tumor (DT) is a rare disease characterized by histologically monoclonal fibroblastic proliferation. DT does not have metastatic spread potentially but can be infiltrative and locally aggressive and decrease patients' quality of life. Although current treatment guidelines recommend active surveillance as initial therapy, systemic therapy should be considered in rapidly progressing or symptomatic patients. Systemic treatments for DT include hormonal blockade, cytotoxic chemotherapy, and tyrosine-kinase inhibitors. In this real-life study, we aimed to evaluate the efficacy of sorafenib in patients with progressing or symptomatic DT. Methods: The clinical, pathological, and treatment data of the patients were retrospectively evaluated. Also, prognostic parameters for overall survival were assessed. We used SPSS v.25 for statistical analysis. Kaplan-Meier and Cox-regression analysis were used for survival analysis. Results: Seventeen patients were included in the study. The ratio of female/male patients was 2.4, and the median age was 32 (range,14-65). Four (23.5%) patients had Gardner syndrome. The rates of extra-abdominal and ıntra-abdominal tumor locations were 64.7% and 35.3%, respectively. The median follow-up duration before sorafenib was 6±0.84 years. Before sorafenib, 15 patients had underwent surgical resection. Four (23.5%) patients received adjuvant radiotherapy. All patients received median two-line systemic therapy, and four (23.5%) patients had received chemotherapy. The median treatment duration of sorafenib was 23.4±2.2 months. One- and two-year progression-free survival ratios were 94.1% and 80.7%, respectively. Grade 3-4 toxicities were observed in six (35.2%) of the patients. In univariate analysis, we found that gender (p = 0.012), ECOG performance status (p = 0.032), and history of Gardner syndrome (p = 0.021) were statistically significant prognostic factors for progression-free survival. However, there was no statistically significant between extra-abdominal and ıntra-abdominal tumor locations (p = 0.56). Conclusions: In the study, we observed that sorafenib was an effective treatment option for previously treated advanced desmoid tumors. Despite a small number of patients, we detected that male gender, poor ECOG performance status, and history of Gardner syndrome were negative prognostic factors for progression-free survival.