Background: Osteosarcoma is a rare but aggressive bone malignancy. Despite advances in multimodal therapy, survival remains suboptimal, highlighting the need for prognostic markers to guide treatment. Methods: This study included 162 osteosarcoma patients who received neoadjuvant chemotherapy followed by surgery between January 2009 and March 2024. Patients received either double (cisplatin + doxorubicin) or triple (MAP or PEI) chemotherapy. Survival analyses were conducted using Kaplan–Meier curves, log-rank tests, and Cox proportional hazards models. Results: The median age was 20 years (IQR: 18–29), and 53.1% were male. Patients who received triple chemotherapy regimens demonstrated significantly longer overall survival (OS) compared to those on doublet regimens. High tumor necrosis rates (>90%) and negative surgical margins were strongly associated with improved OS, while metastatic disease at diagnosis, elevated alkaline phosphatase (ALP), and male gender were linked to poorer survival. Multivariate analysis identified adjuvant therapy, age under 18, high necrosis rate, negative margins, and normal ALP as significant OS predictors. Conclusions: Triple-agent chemotherapy, necrosis rate ≥90 and negative surgical margins are strongly associated with prolonged survival in osteosarcoma. The key prognostic indicators such as ALP levels, surgical margins and age at diagnosis should guide personalized treatment strategies to improve outcomes in curable patients.

Background: Endometrial cancer (EC) is the most common gynecological malignancy in developed countries. While early-stage disease has favorable outcomes, advanced or recurrent EC remains associated with poor prognosis. Novel prognostic markers are needed to refine risk stratification. Systemic inflammation-based indices such as Pan-Immune Inflammation Value (PIV), Systemic Inflammation Response Index (SIRI), and Systemic Immune Inflammation Index (SII) have shown prognostic potential in solid tumors. Methods: We retrospectively evaluated 78 patients with endometrioid EC who had undergone hysterectomy with adnexectomy and lymphadenectomy. Demographic, clinicopathological, and laboratory data were extracted from electronic medical records. PIV, SII, and SIRI were calculated from the preoperative complete blood counts. Survival was assessed using Kaplan–Meier analysis, while prognostic factors were determined using univariate and multivariate Cox regression analyses. Results: The median age was 59 years, and 64.1% of the patients presented with early-stage disease. A high PIV (≥802) was significantly associated with a shorter overall survival (64 vs. 111 months, p < 0.001). PIV demonstrated the highest discriminatory accuracy (AUC = 0.776), followed by the SII (0.747) and SIRI (0.718). Univariate analysis identified that age, grade, LVSI, PNI, stage, distant metastasis, and high PIV, SII, SIRI, and NLR were predictors of poor survival. Multivariate analysis confirmed grade, distant metastasis and SIRI ≥ 1.5 as independent prognostic factors. Conclusions: Inflammation-based indices, particularly PIV and SIRI, correlated with survival outcomes in patients with EC. The SIRI retained an independent prognostic value, whereas PIV showed a strong discriminatory capacity. Incorporating these indices into established risk models may improve prognostic precision and support individualized management.

Immune checkpoint inhibitors such as nivolumab have brought meaningful benefits to patients with advanced non-small cell lung cancer (NSCLC), yet many patients still experience limited responses. Vitamin D is a key modulator of immune function, and deficiency is common in individuals with cancer. Given its potential role in shaping immunotherapy response, we retrospectively assessed whether baseline vitamin D levels were associated with clinical outcomes in advanced NSCLC patients treated with nivolumab. We retrospectively analyzed patients with stage IV NSCLC treated with nivolumab across multiple centers, predominantly as second-line therapy. Prior to nivolumab initiation, all patients were confirmed to be negative for common driver mutations, including EGFR, ALK, ROS1, and other actionable genomic alterations. Baseline serum 25-hydroxyvitamin D levels were measured prior to nivolumab initiation, and patients were categorized as having severe deficiency (< 10 ng/mL), deficiency (10–20 ng/mL), or sufficient levels (≥ 20 ng/mL). The presence of liver metastases was recorded at baseline. Progression-free survival (PFS) and overall survival (OS) were estimated using the Kaplan-Meier method and compared with log-rank tests. Multivariable Cox proportional hazards models adjusted for age, sex, ECOG performance status, liver metastasis, and other metastatic sites were used to evaluate the independent prognostic value of vitamin D status. Objective response rates (ORR) were assessed in patients with available radiologic data. A total of 890 patients were screened, and after excluding those with missing baseline vitamin D data, 305 patients were included in the analysis. The median age was 64 years (range 34–85), and 68% of patients were male. Vitamin D levels were < 10 ng/mL in 30%, 10–20 ng/mL in 44%, and ≥ 20 ng/mL in 26% of patients. Patients with severe vitamin D deficiency were numerically older (median age 65 vs. 63 years) and had higher rates of ECOG PS ≥ 2 (15.1% vs. 7.5%) and squamous histology (37.6% vs. 27.5%), though these differences were not statistically significant (p > 0.05 for all). Liver metastases were present in 54 patients (17.7%), and the distribution was similar across vitamin D groups (p = 0.92). Median PFS was shortest in patients with severe vitamin D deficiency (3.4 months), intermediate in the 10–20 ng/mL group (5.2 months), and longest in patients with sufficient levels (8.1 months). Median OS ranged from 8.6 months in the < 10 ng/mL group to 15.8 months in the ≥ 20 ng/mL group. Patients with liver metastases had significantly shorter OS compared to those without (median OS 9.8 vs. 13.6 months, HR 1.48, p = 0.006). Vitamin D deficiency was associated with significantly worse PFS and OS on univariate analysis. In multivariable analysis, vitamin D levels < 20 ng/mL remained independently associated with poorer OS. ORR was numerically higher in patients with sufficient vitamin D levels (30% vs. 14%). Lower baseline vitamin D levels were associated with inferior clinical outcomes in advanced NSCLC patients treated with nivolumab. Patients with vitamin D levels ≥ 20 ng/mL demonstrated longer PFS and OS and a trend toward higher response rates. These findings support a prognostic role for vitamin D status in immunotherapy-treated NSCLC; however, prospective studies are required to determine whether vitamin D optimization can causally enhance immunotherapy efficacy.

Background/Objectives: Uveal melanoma (UM) is a subtype of melanoma that originates from the uveal layer of the eye (iris, ciliary body, choroid) and is biologically distinct from cutaneous melanoma. The real-world evidence on treatment patterns and survival outcomes, particularly from non-Western populations, remains limited. This study provides a comprehensive national overview of local and systemic management of UM across Türkiye. Methods: This multicenter retrospective cohort study, coordinated by the Turkish Oncology Group (TOG), included patients diagnosed with UM between 2012 and 2025 across 19 tertiary oncology centers. Clinical characteristics, treatment patterns, and outcomes were analyzed. Systemic therapies were subgrouped as immunotherapy or cytotoxic chemotherapy. Progression-free survival (PFS) and overall survival (OS) were assessed by the Kaplan–Meier method; prognostic factors for OS were analyzed by Cox regression. Results: A total of 113 patients were included; 89.4% presented with localized disease. During follow-up, 43.4% developed metastases, predominantly hepatic (93.5%). 47.4% of metastatic patients received liver-directed treatments; the most common treatment was radioembolization, and these treatments were associated with longer OS. Among 59 patients receiving systemic therapy, immunotherapy demonstrated higher ORR and DCR than chemotherapy across treatment lines, although small subgroup sizes limited statistical significance. Dual immune checkpoint blockade emerged as an independent favorable prognostic factor in multivariate analysis. Median OS for metastatic patients was 16 months (95% CI: 9.3–22.7). HLA-A*02:01 was positive in 29.4% of patients tested, and only three patients received tebentafusp. Conclusions: This large national cohort highlights substantial real-world heterogeneity in treatment patterns and confirms the limited efficacy of chemotherapy, the prognostic benefit of dual ICI therapy, and the potential survival advantage of liver-directed treatments in selected patients. Low HLA-A*02:01 positivity and limited access to tebentafusp remain major challenges in Türkiye. These findings provide an essential benchmark for improving treatment strategies in metastatic UM.

Background/Objectives: Genomic profiling guides treatment in metastatic non-small-cell lung cancer (mNSCLC), yet country-level data from Türkiye remain limited. Methods: We retrospectively analyzed consecutive patients with mNSCLC diagnosed between January 2018 and March 2025 across tertiary centers in all seven regions. Variables included demographics, smoking, histology, testing modality (single-gene vs. next-generation sequencing [NGS]), targetable genomic alterations (TGAs) and co-mutations, and programmed death-ligand 1 (PD-L1) tumor proportion score. Results: Among 1023 patients (mean age 64 years; 76.4% male), tobacco exposure was frequent (mean 42.1 pack-years); 16.9% were never-smokers. NGS use increased over time, exceeding 90% by 2025. TGAs were detected in 28.3% (EGFR 16.0%, ALK 5.0%, KRAS G12C 2.6%, BRAF V600E 3.2%; ROS1, MET exon 14, HER2, NTRK ≤ 2.5%; no RET). EGFR alterations occurred in 19% of non-squamous carcinomas and 6% of squamous cell carcinomas (SCCs), suggesting an intermediate East–West pattern. Among NGS-tested samples, TP53 was the most frequent co-mutation (33.1%), followed by alterations in CDKN2A, PIK3CA, FGFR, STK11, and KEAP1. Conclusions: In this large, multicenter Turkish real-world cohort, the TGA spectrum broadly mirrors global patterns while revealing local nuances; EGFR mutations were more frequent than expected in SCC, and nationwide NGS adoption is accelerating. Limitations include retrospective design, non-centralized PD-L1 testing, and missing data. Prospective, standardized studies integrating outcomes and resistance mechanisms are warranted to refine regional precision oncology.

Nivolumab is currently widely used in the treatment of lung cancer. Studies have been conducted using flat doses of 240 mg and 3 mg/kg. In fact, studies involving a small number of patients have begun to explore low-dose immunotherapies. The literature on the optimal dose of immunotherapy, the use of weight based, or fixed doses is very recent and has become a one of the subject of ongoing research. This multicenter study included 716 patients with NSCLC. Patients receiving standard doses of 3 mg/kg and 240 mg of nivolumab were divided into subgroups based on their weight. Patients weighing 80 kg have already received a flat dose. However, patients weighing < 80 kg who received a flat dose were considered to be receiving high-dose therapy. Conversely, patients weighing more than 80 kg who received a flat dose were maintained on a low dose. Therefore, overall survival, progression-free survival, and toxicity were examined according to weight-based usage. The median progression free survival (PFS) for those receiving a 3 mg/kg dose was 6 months, whereas it was 9.8 months for those receiving a flat dose (p < 0.001). The median (metastatic overall survival) OS for those receiving a 3 mg/kg dose was 12 months, whereas it was 14 months for those receiving a 240 mg dose (p = 0.03). This study was based on real-world data. Therefore, our results may be instructive regarding the nivolumab dose, which is a commonly used treatment for NSCLC patients. Our results suggest that a flat dose may be preferred in all groups and as a subgroup, especially in patients weighing < 80 kg.