Real-world Experience of Cabozantinib as Second- or Subsequent Line Treatment in Patients With Metastatic Renal Cell Carcinoma: Data From the Polish Managed Access Program.

BACKGROUND: Cabozantinib is an approved treatment for metastatic renal cell carcinoma (mRCC). This report presents an analysis of the safety profile and efficacy of cabozantinib in an unselected population from Poland. PATIENTS AND METHODS: Patients with mRCC, who had been treated with at least 1 previous agent targeting the vascular endothelial growth factor pathway, were eligible to receive cabozantinib at a once-daily dose of 60 mg orally, according to the Managed Access Program (MAP). Data were collected in 4 Polish centers. Patients who had received ≥ 1 dose of cabozantinib were monitored for adverse events (AEs) using Common Terminology Criteria for Adverse Events (CTCAE) v.4.0. RESULTS: A total of 115 patients were enrolled between October 2016 and March 2018, including 50% with bone metastases, 10% with brain metastases and 4.3% with non-clear-cell RCC; 76% had received ≥ 2 lines of therapy. The median time of follow-up was 12.6 months (95% confidence interval [CI], 11.5-14.1 months). The most common grade 3 and 4 AEs were fatigue (23%), hand-foot syndrome (12%), and diarrhea (10%). Only 4% of patients discontinued treatment owing to AEs, and there were no treatment-related deaths. Partial response was observed in 19% of patients, whereas 56% had stable disease. The median progression-free survival was 12.5 months (95% CI, 9.2-14.2 months), with a 12-month overall survival rate of 70.4% (95% CI, 60.2%-78.5%). CONCLUSIONS: Cabozantinib demonstrated acceptable tolerability and activity in a large unselected population of patients with mRCC under clinical conditions.

Aromatase inhibitor therapy for endometrial stromal sarcoma - two-centre experience.

OBJECTIVES: Endocrine therapy is the recommended systemic treatment for steroid receptor positive endometrial stromal sarcoma (ESS). There is no current consensus on the optimal hormonal therapy for ESS. The literature offers several reports on advanced/recurrent/metastatic ESS patients treated with progestins, whereas data on the efficacy of aromatase inhibitors are scarce. MATERIAL AND METHODS: We retrospectively identified cases treated for ESS with aromatase inhibitors at our institutions. There were five patients with advanced or unresectable recurrent estrogen, progesterone and androgen receptor-positive ESS, treated with aromatase inhibitors: letrozole or anastrozole (at a daily dose of 2.5 mg and 1 mg, respectively), as first-line endocrine therapy in all but one case treated following progression with megestrol acetate. RESULTS: Disease stabilization was achieved in four cases (80%), including two with long-term progression-free survival for up to 10 years attained under letrozole treatment, and one case after prior progestin treatment. During therapy, no substantial toxicity was observed. CONCLUSIONS: Aromatase inhibitors as first- or second-line endocrine treatment achieve disease control in most steroid receptor positive ESS. Our series of cases is evidence of aromatase inhibitors efficacy as long-term endocrine treatment option for ESS patients.