Primary bone tumors are rare in modern populations, thus, finding a tumor in a fossil so old is a unique discovery. (sciencedaily.com)
Osteosarcoma is the most common primary bone tumor of dogs. (houstonpettalk.com)
Canine osteosarcoma (cOSA), the most common primary bone cancer in dogs, is a highly aggressive tumor with an estimated spread (or metastasis) rate of approximately 90 %. (agsdcf.com)