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    Novel tumor marker index combining carcinoembryonic antigen and carbohydrate antigen 19-9: New prognostic factor for metastatic colorectal cancer
    (Baishideng Publishing Group Inc, 2025) Ilhan, Yusuf; Balcik, Onur Yazdan; Guzel, Halil Goksel; Onder, Arif Hakan; Demir, Bilgin; Baser, Mehmet Nuri; Karadag, Ibrahim
    BACKGROUND Metastatic colorectal cancer (mCRC) is a global health challenge with a poor prognosis. Prognostic markers are critical for survival prediction. AIM To evaluate a novel tumor marker index (TMI) combining carcinoembryonic antigen and carbohydrate antigen 19-9. METHODS This multicenter, retrospective study measured baseline carcinoembryonic antigen and carbohydrate antigen 19-9 levels to calculate a TMI as the geometric mean of values normalized to their upper limits of normal. Receiver operating characteristic curve analysis assessed TMI's prognostic accuracy, and patients were stratified into high-TMI (>= 1.39) and low-TMI (< 1.39) groups. The primary endpoint was overall survival (OS), with progression-free survival and treatment response as secondary endpoints. RESULTS The study included 305 mCRC patients with a median follow-up of 22.9 months. The median OS for high-TMI patients was 29.5 months, significantly lower than the 45.6 months observed in the low-TMI group (P = 0.02). The 2-year OS rates for the high- and low-TMI groups were 59.4% and 72.9%, respectively. Median progression-free survival was also shorter for the high-TMI group (14.0 vs 16.0 months, P = 0.84). High TMI is an independent prognostic factor for worse OS. CONCLUSION TMI is a simple, cost-effective prognostic tool for mCRC, with high TMI associated with poorer survival outcomes.
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    Reshaping the landscape of ovarian cancer: implications from the surgery for ovarian cancer FIGO 4 study
    (Mosby-Elsevier, 2025) Guzel, Halil Goksel; Balcik, Onur Yazdan; Ilhan, Yusuf
    [Abstract Not Available]
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    Rethinking Neoadjuvant Therapy: A Critical Evaluation of Exclusion Criteria in Gastric Cancer Surgery Studies
    (Korean Gastric Cancer Assoc, 2025) Ilhan, Yusuf; Guzel, Halil Goksel; Balcik, Onur Yazdan
    [Abstract Not Available]