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Champion European sprinter Polar Falcon, sire of English champion juvenile filly Red Camellia and several Group 1 winners, was euthanized Wednesday at age 14 after an illness thought to result from a lung tumor, the Racing Post reported Friday. Retired after finishing 11th in the 1991 Breeders' Cup Mile, Polar Falcon ended his career with a record of 12-5-1-0 and earnings of more than $300,000 and now has seven crops to race so far, with more than $6.5 million in progeny earnings. . . . The Houston Equine Research Organization has given a $20,000 grant to the University of Illinois at Urbana to study whether antihistamines and similar drugs can be used to deter exercise-induced pulmonary hemorrhaging in horses. The one-year project is to be completed by Dec. 31, 2002. . . . Tony Chamblin, the former president of the Association of Racing Commissioners International, said Thursday night that he has filed a lawsuit in Fayette County circuit court accusing several RCI board members of defamation. Chamblin stepped down earlier this year from the RCI amid criticism from some members over his tenure at the association.