Denver Zoo officials said a sad goodbye Wednesday to their South African lion Rian, who at 15 was battling an aggressive form of lymphoma. Veterinarians at the zoo and Colorado State University were treating Rian with chemotherapy developed for domestic cats, a first that they had hoped would help develop a protocol for other big cats with cancer. "Originally we did see incremental levels of improvement in Rian, but in the last couple days it became evident his quality of life was quickly diminishing and we decided it was time to say goodbye," said veterinarian Betsy Stringer. "We hope some of what we learned with Rian will help another lion down the road."
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