Abstract
BackgroundThere are robust data supporting the contribution of oxaliplatin (L-OHP) regarding clinical outcomes for colorectal cancer (CRC) in an adjuvant setting in European and US trials; however, there is no Japanese clinical evidence although L-OHP has been approved since 2009. We examined the transition of adjuvant chemotherapy for stage III colorectal cancer in our institute.MethodsA total of 642 patients with histopathologically confirmed stage III CRC underwent curative surgery from 2005 to 2010. We examined disease free survival (DFS), overall survival (OS) and prognostic factors for stage III CRC patients who underwent adjuvant chemotherapy.ResultsA total of 509 patients received adjuvant chemotherapy. 3-year DFS and 5-year OS rates were 74.5% and 87.5%, respectively. The frequency of inclusion of L-OHP as adjuvant chemotherapy was increased after 2008. A total of 189 patients received adjuvant chemotherapy from 2005 to 2007 increasing to 320 patients from 2008 to 2010; the 5-year OS rates were 82.4% and 91.5%, respectively, and the 3-year DFS rates were 69.2% and 76.6%, respectively (OS, P = 0.007; DFS, P = 0.023). In univariate analysis, adjuvant chemotherapy including L-OHP was no significant deference compared to FU monotherapy. (OS: HR 0.88, 95%CI 0.4–1.91, p = 0.75, DFS: HR 0.78, 95%CI 0.21–2.3, p = 0.29). In multivariate analysis, the OS was predicted by means of N stage (HR = 2; 95%CI, 1.1–3.8; P = 0.02) and pathology (HR = 0.28; 95%CI, 0.13–0.59; P = 0.0008). The DFS was predicted by means of N stage (HR = 2.67; 95%CI, 1.82–3.9; P < 0.05), T stage (HR = 1.61; 95%CI, 1.1–2.3; P = 0.01) pathology (HR = 0.47; 95%CI, 0.29–0.75; P < 0.05) and venous invasion (HR = 2.06; 95%CI, 1.12–3.77; P = 0.01).ConclusionsClinical outcomes of stage III CRC patients receiving adjuvant chemotherapy improved. The frequency of L-OHP usage was increasing annually, however it was no influence for clinical outcomes in this study. It will be necessary to reevaluate additional effect of L-OHP with more patients.
Highlights
50,000 people per year die from colorectal cancer
We examined disease free survival (DFS), overall survival (OS) and prognostic factors for stage III colorectal cancer (CRC) patients who underwent adjuvant chemotherapy
Adjuvant chemotherapy including L-OHP was no significant deference compared to FU monotherapy. (OS: HR 0.88, 95%CI 0.4–1.91, p = 0.75, DFS: HR 0.78, 95%CI 0.21–2.3, p = 0.29)
Summary
50,000 people per year die from colorectal cancer. It is the second-leading cause of cancer deaths. Both the mortality rate and the prevalence of colorectal cancer have increased in Japan over recent decades. Stage I and II colorectal cancer (CRC) have good survival rates after treatment involving surgery or endoscopic therapy alone; the 5-year survival rate of patients with stage III CRC, especially stage IIIb (T any, N2: using the Japanese classification of colorectal cancer) is worse (56.0%), because the recurrence rate is high (stage III CRC, 30.8%).[4] The use of adjuvant chemotherapy could be contributing to a reduction in mortality and recurrence.
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