Interferon-α/β Receptor as a Prognostic. Marker in Osteosarcoma

Kubo, Tadahiko; Shimose, Shoji; Matsuo, Toshihiro; Fujimori, Jun; Arihiro, Koji; Ochi, Mitsuo
March 2011
Journal of Bone & Joint Surgery, American Volume;3/16/2011, Vol. 93-A Issue 6, p519
Academic Journal
Background: A large-scale randomized trial of adjuvant interferon-α therapy for patients with osteosarcoma has been initiated as a joint protocol by the European and American Osteosarcoma Study Group. Because the expression of functional interferon-α/β receptor is necessary for interferon-a agents to interact with osteosarcoma cells, we examined the expression of interferonα/β receptor in a series of osteosarcoma specimens. Methods: Forty patients with high-grade resectable osteosarcoma, from whom surgical specimens had been obtained at the time of biopsy, were included in this retrospective study. Biopsy specimens were immunohistochemically stained with anti-interferon-a/13 receptor antibodies. Survival was estimated with the Kaplan-Meier method. The Cox proportional hazards model was used for multivariate analysis to determine the independent prognostic factors. Furthermore, we used Holm and Benjamini-Hochberg procedures to adjust for multiple comparisons in setting the level of significance. The median follow-up period was five years and two months (range, four to 195 months). Results: The expression of interferon-a/13 receptor was positive in eighteen (45%) of the forty patients with high-grade osteosarcoma. American Joint Committee on Cancer surgical stage HA, a good histologic response to chemotherapy, and expression of interferon-a/13 receptor correlated significantly with better disease-free survival (p < 0.05). Multivariate analysis showed that interferon-a/13 receptor expression alone retained its power to predict an improved prognosis (p = 0.042). There were no significant variables after corrections for multiple comparisons. Conclusions: lnterferon-a/3 receptor may be a useful marker for assessing tumor prognosis in patients with osteosarcoma and may play an important role in tumor progression. These findings are encouraging and support the ongoing clinical trials of adjuvant interferon-a therapy by the multinational Osteosarcoma Study Group. Our pilot study was based on a small sample size, and larger trials are needed to confirm this finding.


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