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Expression of Insulin-like Growth Factor-1 Receptor in Synovial Sarcoma

Association with an Aggressive Phenotype¹

Cellular and Molecular Tumor Pathology, Karolinska Hospital, SE-171 76 Stockholm [Y. X., B. S., G. N., B. B., O. L.]; Department of Orthopedics, Stockholm Söder Hospital, SE-100 64 Stockholm [B. S.]; and Department of Orthopedics, Karolinska Hospital, SE-171 76 Stockholm [G. N.], Sweden

It is well known that insulin-like growth factor-1 receptor (IGF-1R) plays a crucial role in proliferation and survival of transformed cells. Overexpression of IGF-1R in certain tumors has been reported, but there is still little known about its importance in vivo. Here, we evaluated the IGF-1R levels in 35 human synovial sarcoma tumors by Western blot and reverse transcriptase-PCR. In 18 of these, IGF-1R was detectable by Western blot, whereas 17 were nondetectable. There was a significant association between the amount of receptor proteins and mRNA transcripts. Furthermore, we found that the IGF-1R Western blot-positive tumors were associated with a high incidence of lung metastases. Eleven of 18 (61%) developed metastases in the IGF-1R detectable group, compared to 3 of 17 (18%) in the nondetectable group (P = 0.01). Moreover, in the detectable group of IGF-1R, 12 of 18 (67%) exhibited a high tumor cell proliferative rate, compared to 5 of 16 (31%) in the nondetectable group (P = 0.04). On the other hand, no association was found between the IGF-1R and type of fusion gene transcript (SYT-SSX1 or SYT-SSX2). Our results suggest that expression of IGF-1R can underlie an aggressive phenotype in synovial sarcoma.

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