We have one other member from Argentina:
http://www.synovialsarcomasurvivors.org/profile/oscartennis732
If he doesn't reply to this discussion, you can try to send him a private message but first you will have to add him as a friend.
Another way to find specialists in Argentina is to use pubmed:
http://www.ncbi.nlm.nih.gov/pubmed/?term=Argentina+sarcoma
I put Argentina and Sarcoma in the search for you. Then you can click on a study and under the study title on "Author Information". It gives you the place in Argentina where the study was done.
For example, the first study gives you this information:
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1CEQUINOR (Centro de Química Inorgánica), Facultad de Ciencias Exactas, UNLP. 47 y 115 (1900), La Plata, Argentina; Cátedra de Bioquímica Patológica, Facultad de Ciencias Exactas, UNLP. 47 y 115 (1900), La Plata, Argentina. Electronic address: ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■.
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2CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica), Cno Centenario y 506, CC 49 (B1897ZCA), M.B. Gonnet, Prov. Buenos Aires, Argentina.
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3Cátedra de Bioquímica Patológica, Facultad de Ciencias Exactas, UNLP. 47 y 115 (1900), La Plata, Argentina; CETMIC (Centro de Tecnología de Recursos Minerales y Cerámica), Cno Centenario y 506, CC 49 (B1897ZCA), M.B. Gonnet, Prov. Buenos Aires, Argentina.
Not all studies are relevant and you may want to change the search to "Argentina Ewing sarcoma". The whole idea is to find the hospitals in Argentina that have done some research on Ewing's sarcoma. If they have researchers that studied sarcoma, they probably have oncologists that specialize in sarcoma...