The cause of Ewing sarcoma is unknown, and there’s been no aspwv1970-01-01T00:00:00-05:00January 1st, 1970|Twitter| The cause of Ewing sarcoma is unknown, and there’s been no evidence linking the Pennsylvania cases to natural gas.… https://t.co/v72P1nenvi Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail