Journals / Turkish Journal of Clinics and Laboratory / 2026 / Sayı: 1

Survival outcomes according to adjuvant chemotherapy duration and oxaliplatin use in patients aged 70 years and older with stage II–III colon cancer

Evre II–III kolon kanserli 70 yaş ve üzeri hastalarda adjuvan kemoterapi süresi ve oksaliplatin kullanımına göre sağkalım sonuçları

Ömer Acar(Department of Medical Oncology, Mardin Training and Research Hospital, Mardin, Turkey)0000-0003-4408-1976
Emine Türkmen(Department of Medical Oncology, Manisa Celal Bayar University, Manisa, Turkey)0000-0002-1540-3705
Mustafa Şahbazlar(Department of Medical Oncology, Manisa Celal Bayar University, Manisa, Turkey)0000-0003-1857-593X
Ferhat Ekinci(Department of Medical Oncology, Manisa Celal Bayar University, Manisa, Turkey)0000-0002-9317-942X
Atike Pinar Erdoğan(Department of Medical Oncology, Manisa Celal Bayar University, Manisa, Turkey)0000-0003-4859-7574
Pages
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Publication Date
2026-03-14
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Overall survival (OS) and disease-free survival (DFS) were analyzed using the Kaplan–Meier method.

📌 3 Key Takeaways

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Objective & Hypothesis:Aim: The optimal balance between treatment duration and regimen selection in older patients with stage II–III colon cancer remains uncertain in real-world practice.
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Key Findings & Data:Material and Methods: This retrospective cohort study included patients aged ≥70 years with stage II–III colon adenocarcinoma who underwent curative-intent surgery and received adjuvant chemotherapy between 2015 and 2023.
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Conclusion & Impact:Overall survival (OS) and disease-free survival (DFS) were analyzed using the Kaplan–Meier method.
🔬Design:Araştırma Makalesi
📍Scope:2015 Verileri
⚙️Variables:Kolon kanseri · Adjuvan kemoterapi · Oksaliplatin

Abstract

Aim: The optimal balance between treatment duration and regimen selection in older patients with stage II–III colon cancer remains uncertain in real-world practice. This study aimed to evaluate survival outcomes according to adjuvant chemotherapy duration and oxaliplatin use in older patients with stage II–III colon cancer. Material and Methods: This retrospective cohort study included patients aged ≥70 years with stage II–III colon adenocarcinoma who underwent curative-intent surgery and received adjuvant chemotherapy between 2015 and 2023. Patients were grouped according to adjuvant chemotherapy regimen (oxaliplatin-based vs non-oxaliplatin) and treatment duration. Overall survival (OS) and disease-free survival (DFS) were analyzed using the Kaplan–Meier method. Factors associated with survival outcomes were evaluated using Cox proportional hazards regression, and multivariable logistic regression analyses were additionally performed for all-cause mortality and recurrence. Results: A total of 65 patients were included, of whom 35 received oxaliplatin-based regimens. Patients treated with oxaliplatin were younger and more frequently had stage III disease. In multivariable analysis, age >75 years (OR 3.45, 95% CI 1.16–10.21; p = 0.026) and adjuvant chemotherapy duration <6 months (OR 3.80, 95% CI 1.32–10.91; p = 0.013) were independently associated with increased all-cause mortality. Oxaliplatin use was not independently associated with overall survival (OR 1.36, 95% CI 0.45–4.11; p = 0.584) or recurrence risk. Kaplan–Meier analyses demonstrated significantly improved overall survival among patients who completed a full 6-month course of adjuvant chemotherapy, whereas no significant differences in overall or disease-free survival were observed according to oxaliplatin use. Conclusion: In older patients with stage II–III colon cancer, completion of the planned duration of adjuvant chemotherapy appeared more impactful than regimen intensification with oxaliplatin in this real-world cohort. These findings highlight the importance of treatment continuity in routine clinical practice, particularly among older patients with limited tolerance to treatment.

Özet

Amaç: Evre II–III kolon kanseri olan yaşlı hastalarda adjuvan kemoterapi süresi ve rejim seçimi arasındaki optimal denge gerçek dünya pratiğinde halen net değildir. Bu çalışmada, evre II–III kolon kanseri olan yaşlı hastalarda adjuvan kemoterapi süresi ve oksaliplatin kullanımına göre sağkalım sonuçlarının değerlendirilmesi amaçlanmıştır. Gereç ve Yöntemler: Bu retrospektif kohort çalışması, 2015 ile 2023 yılları arasında küratif amaçlı cerrahi geçiren ve adjuvan kemoterapi alan, evre II–III kolon adenokarsinomlu ve 70 yaş ve üzeri hastaları içermiştir. Hastalar, adjuvan kemoterapi rejimine (oksaliplatin bazlı ve oksaliplatin içermeyen) ve tedavi süresine göre gruplandırılmıştır. Genel sağkalım (OS) ve hastalıksız sağkalım (DFS), Kaplan–Meier yöntemi ile analiz edilmiştir. Tüm nedenlere bağlı mortalite ve nüks ile ilişkili faktörler, çok değişkenli lojistik regresyon analizi kullanılarak değerlendirilmiştir. Bulgular: Toplam 65 hasta çalışmaya dâhil edilmiş olup, bunların 35’i oksaliplatin bazlı rejimler almıştır. Oksaliplatin ile tedavi edilen hastalar daha genç olup, evre III hastalık daha sık görülmüştür. Çok değişkenli analizde, >75 yaş (OR 3,45; %95 GA 1,16–10,21; p = 0,026) ve adjuvan kemoterapi süresinin <6 ay olması (OR 3,80; %95 GA 1,32–10,91; p = 0,013) tüm nedenlere bağlı mortalite ile bağımsız olarak ilişkili bulunmuştur. Oksaliplatin kullanımı, genel sağkalım (OR 1,36; %95 GA 0,45–4,11; p = 0,584) veya nüks riski ile bağımsız olarak ilişkili değildir. Kaplan–Meier analizleri, adjuvan kemoterapinin tam 6 ay tamamlandığı hastalarda genel sağkalımın anlamlı olarak daha iyi olduğunu göstermiş; buna karşın oksaliplatin kullanımına göre genel sağkalım veya hastalıksız sağkalım açısından anlamlı bir fark saptanmamıştır. Sonuç: Evre II–III kolon kanseri olan yaşlı hastalarda, adjuvan kemoterapinin 6 ay süreyle tamamlanması, floropirimidin bazlı rejimlere oksaliplatin eklenmesine kıyasla sağkalım ile daha güçlü bir ilişki göstermektedir. Bu bulgular, rutin klinik uygulamada özellikle tedavi toleransı sınırlı olan yaşlı hastalarda tedavi süresi ve sürekliliğinin rejim yoğunluğundan daha belirleyici olabileceğini düşündürmektedir.

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Cite This Article

Acar, Ö., Türkmen, E., Şahbazlar, M., Ekinci, F., Erdoğan, A. P. (2026). Survival outcomes according to adjuvant chemotherapy duration and oxaliplatin use in patients aged 70 years and older with stage II–III colon cancer. Turkish Journal of Clinics and Laboratory, Sayı: 1. https://doi.org/10.18663/tjcl.1861167

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References (17)

  1. Collienne M, Arnold D. The optimal duration of adjuvant chemotherapy in colon cancer. Cancers (Basel) 2020; 12: 2509.
  2. Yoshino T, Yamanaka T, Oki E, Kotaka M, Manaka D, Eto T, et al. Efficacy and long-term peripheral sensory neuropathy of 3 vs 6 months of oxaliplatin-based adjuvant chemotherapy for colon cancer: The ACHIEVE phase 3 randomized clinical trial. JAMA Oncol 2019; 5: 1574-1581.
  3. Souglakos J, Boukovinas I, Kakolyris S, Xynogalos S, Ziras N, Athanasiadis A, et al. Three- versus six-month adjuvant FOLFOX or CAPOX for high-risk stage II and stage III colon cancer patients: The efficacy results of Hellenic Oncology Research Group (HORG) participation to the International Duration Evaluation of Adjuvant Chemotherapy (IDEA) project. Ann Oncol 2019; 30: 1304-1310.
  4. Grothey A, Sobrero AF, Shields AF, Yoshino T, Paul J, Taieb J, et al. Duration of adjuvant chemotherapy for stage III colon cancer. N Engl J Med 2018; 378: 1177-1188.
  5. Gallois C, Shi Q, Pederson LD, Andre T, Iveson TJ, Sobrero AF, et al. Oxaliplatin-based adjuvant chemotherapy in older patients with stage III colon cancer: An ACCENT/IDEA pooled analysis of 12 trials. J Clin Oncol 2024; 42: 2295-2305.
  6. Kuang Z, Wang J, Liu K, Wu J, Li J. Optimal duration of oxaliplatin-based adjuvant chemotherapy in patients with different risk factors for stage II-III colon cancer: A meta-analysis. Int J Surg 2024; 110: 3030-3038.
  7. Shi Q, Paul J, Grothey A. Duration of adjuvant chemotherapy for stage III colon cancer. N Engl J Med 2018; 379: 396-397.
  8. Andre T, Meyerhardt J, Iveson T, Sobrero A, Yoshino T, Souglakos I, et al. Effect of duration of adjuvant chemotherapy for patients with stage III colon cancer (IDEA collaboration): Final results from a prospective, pooled analysis of six randomised, phase 3 trials. Lancet Oncol 2020; 21: 1620-1629.
  9. Webster-Clark M, Keil AP, Robert N, Frytak JR, Boyd M, Sturmer T, et al. Comparing trial and real-world adjuvant oxaliplatin delivery in patients with stage III colon cancer using a longitudinal cumulative dose. JAMA Oncol 2022; 8: 1821-1824.
  10. Chen K, Collins G, Wang H, Toh JWT. Pathological features and prognostication in colorectal cancer. Curr Oncol 2021; 28: 5356-5383.
  11. Baxter NN, Kennedy EB, Bergsland E, Berlin J, George TJ, Gill S, et al. Adjuvant therapy for stage II colon cancer: ASCO guideline update. J Clin Oncol 2022; 40: 892-910.
  12. Rebuzzi SE, Pesola G, Martelli V, Sobrero AF. Adjuvant chemotherapy for stage II colon cancer. Cancers (Basel) 2020; 12: 2584.
  13. Chu CH, Lai IL, Jong BK, Chiang SF, Tsai WS, Hsieh PS, et al. The prognostic and predictive significance of perineural invasion in stage I to III colon cancer: A propensity score matching-based analysis. World J Surg Oncol 2024; 22: 129.
  14. Tu J, Yao Z, Wu W, Ju J, Xu Y, Liu Y. Perineural invasion is a strong prognostic factor but not a predictive factor of response to adjuvant chemotherapy in node-negative colon cancer. Front Oncol 2021; 11: 663154.
  15. Tie J, Cohen JD, Lahouel K, Lo SN, Wang Y, Kosmider S, et al. Circulating tumor DNA analysis guiding adjuvant therapy in stage II colon cancer. N Engl J Med 2022; 386: 2261-2272.
  16. Tie J, Wang Y, Lo SN, Lahouel K, Cohen JD, Wong R, et al. Circulating tumor DNA analysis guiding adjuvant therapy in stage II colon cancer: 5-year outcomes of the randomized DYNAMIC trial. Nat Med 2025; 31: 1509-1518.
  17. Chidharla A, Rapoport E, Agarwal K, Madala S, Linares B, Sun W, et al. Circulating tumor DNA as a minimal residual disease assessment and recurrence risk in patients undergoing curative-intent resection with or without adjuvant chemotherapy in colorectal cancer: A systematic review and meta-analysis. Int J Mol Sci 2023; 24: 10230.