Background/Objectives: In the REGOMA trial, regorafenib demonstrated an overall survival advantage over lomustine, and it has become a recommended treatment for recurrent glioblastoma in guidelines. This study aimed to evaluate the effectiveness and safety of regorafenib as a third-line treatment for patients with recurrent glioblastoma who progressed while taking bevacizumab-based therapy. Methods: This retrospective, multicenter study in Turkey included 65 patients treated between 2021 and 2023 across 19 oncology centers. The main inclusion criteria were histologically confirmed isocitrate dehydrogenase (IDH)-wildtype glioblastoma, progression after second-line bevacizumab-based treatment, and an Eastern Cooperative Oncology Group (ECOG) performance status score of ≤2. Patients received regorafenib 160 mg once daily for the first 3 weeks of each 4-week cycle. Results: The median age of the patients was 53 years (18–67 years), with a median progression-free survival of 2.5 months (95% Confidence Interval: 2.23–2.75) and a median overall survival of 4.1 months (95% CI: 3.52–4.68). The median overall survival was improved in patients who received subsequent therapy after regorafenib treatment compared with those who did not (p = 0.022). Progression-free survival was longer in patients with ECOG 0–1 than in those with ECOG 2 (p = 0.042). The safety profile was consistent with that of the REGOMA trial, with no drug-related deaths observed. Conclusions: Regorafenib shows good efficacy and safety as a third-line treatment for recurrent glioblastoma after bevacizumab-based therapy. This study supports the use of regorafenib and emphasizes the need for further randomized studies to validate its role and optimize treatment strategies.

Background: Durvalumab combined with gemcitabine–cisplatin (GC) has become the standard first-line treatment for advanced biliary tract cancer (BTC) following the TOPAZ-1 trial. However, real-world effectiveness, safety, and prognostic determinants, particularly in underrepresented populations, remain insufficiently defined. The aim of this study was to evaluate the real-world outcomes of first-line durvalumab plus chemotherapy and identify independent prognostic factors in patients with advanced BTC. Methods: This multicenter retrospective cohort study included patients with unresectable or metastatic BTC treated with first-line durvalumab plus chemotherapy across 21 tertiary oncology centers in Türkiye. Clinical characteristics, laboratory parameters, biomarker data, and treatment details were collected. The primary endpoint was overall survival (OS), while secondary endpoints included progression-free survival (PFS), objective response rate (ORR), and safety. Survival outcomes were analyzed using the Kaplan–Meier method and Cox proportional hazards regression models. Results: A total of 78 patients were analyzed; 53.8% were male, and the median age was 62 years. Primary tumor sites were intrahepatic (55.1%), extrahepatic (30.8%), and gallbladder (14.1%). After a median follow-up of 12.58 months, median OS was 11.59 months and median PFS was 6.80 months. The ORR was 50.6%, including complete and partial responses in 2.7% and 47.9% of patients, respectively. Treatment-related adverse events occurred in 97.4% of patients, with grade 3–4 events in 37.2%. Immune-related adverse events were observed in 19.2%, including one case of grade 3 pneumonitis. No patient permanently discontinued durvalumab due to toxicity, and no durvalumab-related mortality occurred. In multivariable analysis, ECOG performance status 2 (HR 3.43; 95% CI 1.33–8.80) and ALBI grade 2–3 (HR 2.54; 95% CI 1.24–5.19) independently predicted worse OS, while ECOG performance status 2 also predicted shorter PFS (HR 5.91; 95% CI 2.30–15.17). Conclusions: In this multicenter real-world Turkish cohort, first-line durvalumab plus chemotherapy showed effectiveness and tolerability comparable to clinical trial data. Baseline ECOG performance status and ALBI grade were independent prognostic factors, supporting their use for risk stratification in advanced biliary tract cancer.

Denosumab, a monoclonal antibody against receptor activator of nuclear factor kappa-B ligand (RANKL), is widely used to prevent skeletal-related events (SREs) in patients with bone metastases from solid tumours. However, its safety in individuals with advanced chronic kidney disease (CKD), particularly regarding severe hypocalcaemia and skeletal complications, is not well defined. We conducted a retrospective, multicentre study within the Turkish Oncology Group including patients with breast, prostate, or lung cancer who received denosumab between January 2011 and December 2022. Demographic and clinical data, CKD stage, prior fractures, serum calcium levels, episodes of hypocalcaemia, concomitant medications, and adverse events were recorded. Primary endpoints were the incidences of grade ≥ 3 hypocalcaemia and other grade ≥ 3 toxicities; secondary endpoints included skeletal-related events and overall survival. We analysed 264 patients from 17 oncology centres. Overall, 18 patients (6.8 %) experienced grade ≥ 3 toxicity, including 16 cases of severe hypocalcaemia and two of renal function decline. Among 42 patients with baseline estimated glomerular filtration rate (eGFR) < 60 mL/min, 13 (31.0 %) developed grade ≥ 3 toxicity (11 hypocalcaemia, two renal decline), representing a significantly higher risk than in patients with eGFR ≥ 60 mL/min (p < 0.01). Pathological fractures occurred in 21 patients, six with eGFR < 60 mL/min (p = 0.035). Eight patients required surgery for skeletal-related events, four with eGFR < 60 mL/min (p = 0.012). Cancer patients with CKD receiving denosumab have an increased risk of severe hypocalcaemia and skeletal complications. Close monitoring of calcium and renal function is essential, and clinicians should carefully balance the benefits of denosumab against these risks in this vulnerable population.