Abstract
Phosphorylated p38 (p-p38) played a pivotal role in the regulation of disease progression and correlated with tumor prognosis. Here, we characterized the prognostic effect of p-p38 in colorectal cancer (CRC). Three hundred and sixteen CRC patients in stages I–III were recruited in this study. P-p38 expression was semi-quantitatively evaluated using tissue microarrays and immunohistochemistry staining. Overall survival (OS), disease-free survival (DFS), local failure-free survival (LFFS), and distant metastasis-free survival (DMFS) of patient subgroups, segregated by p-p38 expression level and clinical stage, were compared using Kaplan–Meier analysis. We found that p-p38 was overexpressed in 48.1 % (152/316) CRC tissues, whereas low or deficiently expressed in normal adjacent epithelia. Overexpression of p-p38 predicted poor OS (P < 0.001), DFS (P = 0.002), LFFS (P = 0.016), and DMFS (P = 0.025) in CRC. Importantly, patient subgroups in the early stage (stages I + II) and with low p-p38 had similar OS, PFS, LFFS, and DMFS probabilities to that of stage I, whereas those with high p-p38 were similar to stage III disease. In addition, for stage III disease, the subgroup with low p-p38 had a similar survival probability to that of stage I, whereas the subgroup with high p-p38 had the worst survival. Multivariate Cox analysis confirmed that p-p38 was indeed a significantly independent factor for death, recurrence, and distant metastases in CRC. Our results demonstrated that p-p38 was a negative independent prognostic factor for CRC. Complementing TNM staging with p-p38 might refine the risk definition more accurately for a subset of patients.
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Abbreviations
- p-p38:
-
Phosphorylated p38
- CRC:
-
Colorectal cancer
- OS:
-
Overall survival
- DFS:
-
Disease-free survival
- LFFS:
-
Local failure-free survival
- DMFS:
-
Distant metastasis-free survival
- TNM:
-
Tumor node metastasis
- EGFR:
-
Epidermal growth factor receptor
- MAPKs:
-
Mitogen-activated protein kinases
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (no. 81072042 to L. Wang, no. 81001086 to X.-J. Fan, and no. 81000934 to X.-B. Wan), Natural Science Foundation of Guangdong Province (no. 10251008901000008 to L. Wang), and Project for Outstanding Young and Creative Talent Training Plan in Higher Education Institutions of Guangdong Province (no. LYM10010 to X.-J. Fan).
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X.-J.Fan and X.-B.Wan contributed equally to this work.
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Fig. S1
ROC curve analysis of p-p38 cutoff point for overall survival (a), disease-free survival (b), local failure-free survival (c), and distant metastasis-free survival (d) using p-p38 expression scores (PPT 236 kb)
Table S1
DFS, LFFS, and DMFS comparison of subgroups with different clinical stages and with p-p38 within stages I–III (DOC 38 kb)
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Fan, XJ., Wan, XB., Fu, XH. et al. Phosphorylated p38, a negative prognostic biomarker, complements TNM staging prognostication in colorectal cancer. Tumor Biol. 35, 10487–10495 (2014). https://doi.org/10.1007/s13277-014-2320-3
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DOI: https://doi.org/10.1007/s13277-014-2320-3