I guess it's time we officially joined the club. Our Lana was diagnosed with bone cancer last week. She'd been having pain in her back right leg, and x-rays revealed a lytic area in the bone above the knee (the right distal femur). A urine test was done to rule out blastomycosis, and then the oncologist did a fine needle aspiration, which confirmed the presence of cancer. We don't know what kind of cancer it is yet (we decided not to put Lana through the pain of a bone biopsy), but it's most likely osteosarcoma. I guess we'll know for sure after her amputation, which is scheduled for Wednesday.
Thank you to everyone who has posted in this thread. Reading the information and experiences you've shared has been invaluable to us. We'll let you know how Lana's surgery goes. We've already contacted OSU for the free chemotherapy drugs. Lana's surgery and chemotherapy will be at the University of Wisconsin's Veterinary Hospital in Madison.
In case you're interested, here's a selection of photos of Lana from the past 3.5 years (taken by my wife, Shihmei):
http://www.flickr.com/photos/beautifulcataya/sets/72157623188154570/
Lana came to live with us when she was 4 years old. She's 7.5 now.
Victor