Abstract
Introduction
Most cancer vaccination trials have been performed in human leukocyte antigen (HLA)-A2 positive populations. Some studies have used HLA-A2 negative patients as control group. However, HLA-type and HLA-expression can interact with tumor biology and possibly affect prognosis. HLA-A2 negative patients might constitute an inadequate control group.
Materials and methods
Patients with colorectal cancer were serologically analyzed for HLA-A2 expression. Patients were evaluated for tumor stage, grading, tumor location. Overall survival (OAS) of HLA-A2 positive and HLA-A2 negative patients was compared.
Results
One hundred forty-four patients were evaluable (50% HLA-A2+). Median age was 62 years. UICC stage III or IV: 45.8%. Gender, location, and UICC stage were equally distributed between HLA-A2 subgroups. HLA-A2 positive patients more frequently had grade 3 histology (27.8% vs 13.9%) and chemotherapy (62.9% vs 45.6%). At a median follow-up of 75.8 months, median OAS for the entire study population was 123.3 months, 5-year OAS was 77.5%. No statistically significant difference in OAS was observed between HLA-A2 positive and negative patients (116.5 vs 157 months, 5-year-OAS 74.1 ± 11.6% vs 81 ± 11.6%, p = 0.46). Expectedly, patients with UICC stage I and II disease lived significantly longer than patients with stage III and IV (5-year OAS 94.3% vs 53.4%; p < 0.001). A significantly superior OAS was also found for women, independent of stage or HLA status.
Conclusion
HLA-A2 positive patients exhibit poorer tumor differentiation. This might account for a non-significant difference in OAS. The use of HLA-A2 negative patients as control cohort in CRC vaccinations would rather underestimate potential treatment-related survival effects. Therefore, we suggest they constitute a valid auxiliary control group.
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Abbreviations
- CRC:
-
colorectal cancer
- DC:
-
dendritic cells
- HLA:
-
human leukocyte antigen
- TAA:
-
tumor associated antigen
- NPC:
-
nasopharyngeal carcinoma
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Acknowledgments
We thank Sandra Bauer, Susanne Wojtke, and the whole HLA-Lab team (particularly, Kristina Zuber, Nora Wendt, Sabrina Ballaschke, Kerstin Thomas) for excellent technical assistance.
This work was supported by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG NA 716/1-1).
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Kiewe, P., Mansmann, V., Scheibenbogen, C. et al. HLA-A2 expression, stage, and survival in colorectal cancer. Int J Colorectal Dis 23, 767–772 (2008). https://doi.org/10.1007/s00384-008-0488-y
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DOI: https://doi.org/10.1007/s00384-008-0488-y