Background: The prognostic utility of inflammatory and tumor biomarkers, including neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), and carcinoembryonic antigen (CEA), in rectal cancer has been increasingly studied, but results remain inconsistent. This study evaluates the prognostic significance of pre- and post-chemoradiotherapy (CRT) levels and dynamic changes in NLR, PLR, and CEA for predicting overall survival (OS) and disease-free survival (DFS) in locally advanced rectal cancer (LARC). Methods: This retrospective study included 261 LARC patients treated with neoadjuvant CRT followed by curative surgery. Pre- and post-CRT NLR, PLR, and CEA were collected. Survival analyses were performed using Kaplan–Meier curves and Cox proportional hazards models. ROC curves assessed predictive performance, and patients were stratified by cut-offs and biomarker changes (delta values). Results: The cohort had a mean age of 55.5 years; 55.9% were male, and 93.5% had clinical stage III disease. Post-CRT NLR (HR: 1.05, p = 0.007) and CEA (HR: 1.00, p < 0.001) were independently associated with OS, while post-CRT CEA and AJCC stage III were predictors of DFS (HR: 4.12, p = 0.009). ROC analysis showed improved accuracy when combining NLR (AUC = 0.66) and CEA (AUC = 0.70), yielding a combined AUC of 0.84 for OS. Patients with decreases in both NLR and CEA had the most favorable outcomes, whereas increases in both markers indicated poor prognosis (OS p < 0.0001; DFS p = 0.00019). Conclusions: Post-CRT levels and dynamic changes in NLR and CEA are independent prognostic markers in rectal cancer. Their combined assessment enhances survival prediction and may guide personalized postoperative surveillance and treatment strategies.

Background: Triple-negative breast cancer (TNBC) is an aggressive subtype with limited targeted treatment options. Immunotherapy has recently emerged as a potential strategy. The addition of pembrolizumab to neoadjuvant chemotherapy, as established in the KEYNOTE-522 trial, represents a major advancement in targeted immunotherapy for TNBC. However, real-world data validating its feasibility and outcomes remain limited. This study aims to evaluate, in real-life settings, the impact of adding pembrolizumab to neoadjuvant chemotherapy on complete pathological response (pCR), recurrence-free survival (RFS), and overall survival (OS) in patients with non-metastatic TNBC. Methods: This retrospective cohort study included patients treated at King Hussein Cancer Center (KHCC) between 2015 and 2022. Among 8523 breast cancer cases, 761 were TNBC. Eligible patients had non-metastatic TNBC, received neoadjuvant therapy, and underwent surgery. The immunotherapy group included patients treated with neoadjuvant pembrolizumab (2019–2022); the no-immunotherapy group received standard neoadjuvant chemotherapy (2015–2022). Propensity score matching (1:1, nearest neighbor) was performed based on pre-treatment covariates including age, BMI, clinical stage, comorbidities, smoking, and histopathology. Pathological response, complication rates, RFS, and OS were analyzed using logistic regression and Kaplan–Meier curves with log-rank testing. Results: The matched cohort included 130 patients (65 per group). The study groups’ baseline characteristics were well-balanced between the two groups. Postoperative complication rates were similar across groups, with no significant increase in adverse events observed in the immunotherapy group. The mean lymph node positivity ratio was significantly lower in the immunotherapy group (2.2 ± 7.7 vs. 24.3 ± 33.1, p < 0.001), indicating reduced nodal burden. Pathologic complete response (pCR) was markedly higher with immunotherapy (66.2% vs. 9.2%, p < 0.001). However, survival outcomes were significantly improved with immunotherapy. At three years, RFS was markedly higher in the immunotherapy group (91.8%; 95% CI: 85.0–99.0%) compared to the no-immunotherapy group (53.8%; 95% CI: 42.8–67.8%), with a log-rank p < 0.001. Overall survival also significantly favored the immunotherapy group, with three-year OS of 87.2% versus 67.8% in no-immunotherapy group (p = 0.0015). Conclusions: Neoadjuvant pembrolizumab significantly enhances pathological response, reduces nodal involvement, and provides durable RFS and OS benefits in non-metastatic TNBC without increasing perioperative complications. This study supports incorporating immunotherapy into standard neoadjuvant regimens for TNBC patients and provides real-world evidence from a Middle Eastern tertiary cancer center.