Abstract
Purpose
New prognostic markers are needed for malignant melanoma. Inducible nitric oxide synthase (iNOS) and cyclooxygenase type 2 (COX-2) have been described to correlate with progression of melanoma. Moreover, activating mutations in BRAF/NRAS oncogenes are often detected in melanoma. The BRAF/NRAS mutation status and expression of COX-2 and iNOS were examined to compare their prognostic value for overall survival (OS) in stage III malignant cutaneous melanoma.
Experimental design
The expression of iNOS and COX-2 in metastatic lymph nodes from 21 rapidly progressing (OS from date of diagnosis of stage III disease ≤14 months) and 17 slowly progressing (OS ≥60 months) stage III cutaneous melanoma patients was examined by immunohistochemistry. The presence of BRAF/NRAS mutations was analyzed using direct DNA sequencing. χ2 exact trend test and logistic regression analysis were used for statistical analysis.
Results
Both iNOS (P = 0.002) and COX-2 (P = 0.048) alone significantly predicted OS. The BRAF/NRAS mutation status did not significantly differ between patient groups, although iNOS significantly (P = 0.013) correlated with BRAF mutation frequency. Furthermore, the odds ratio (OR) with respect to OS of iNOS (OR = 10.4) was higher than that of COX-2 (OR = 5.6) and was stable in the multivariate analysis of OS together with disease stage IIIB/C, ulceration, number of metastatic lymph nodes, and Breslow tumor thickness.
Conclusion
Our data show that iNOS is an independent and stronger prognostic factor for OS in stage III malignant cutaneous melanoma than COX-2.
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Acknowledgments
This work was supported by grants to R.K. and J.H. from the Swedish Cancer Society, the Cancer Society of Stockholm, the European Union (Grants “ENACT” and “DC-THERA”), the Karolinska Institutet, and “ALF-Project” grants from the Stockholm City Council.
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Johansson, C.C., Egyházi, S., Masucci, G. et al. Prognostic significance of tumor iNOS and COX-2 in stage III malignant cutaneous melanoma. Cancer Immunol Immunother 58, 1085–1094 (2009). https://doi.org/10.1007/s00262-008-0631-1
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DOI: https://doi.org/10.1007/s00262-008-0631-1