What is the median survival time in an untreated canine osteosarcoma patient?

What is the median survival time in an untreated canine osteosarcoma patient?

• A. 4-6 weeks
• B. 18-20 weeks
• C. 6-12 months
• D. 1-2 years

Answer: (B)

Osteosarcoma in dogs is an aggressive bone cancer that progresses quickly and often spreads to the lungs early. Without treatment, the disease advances to a point where quality of life drops and survival ends in a matter of months. The typical median survival time for untreated cases is about 18–20 weeks, roughly 4.5–5 months. This means half the dogs live longer than about 4.5–5 months and half live shorter. The shorter timeframe of a few weeks is unlikely because many dogs endure more than a month of symptoms before deterioration. Conversely, 6–12 months or 1–2 years would imply a much slower progression than is usually seen without therapy. With treatment, survival can be extended, but without treatment the natural course centers around that few-month range.

Osteosarcoma in dogs is an aggressive bone cancer that progresses quickly and often spreads to the lungs early. Without treatment, the disease advances to a point where quality of life drops and survival ends in a matter of months. The typical median survival time for untreated cases is about 18–20 weeks, roughly 4.5–5 months. This means half the dogs live longer than about 4.5–5 months and half live shorter. The shorter timeframe of a few weeks is unlikely because many dogs endure more than a month of symptoms before deterioration. Conversely, 6–12 months or 1–2 years would imply a much slower progression than is usually seen without therapy. With treatment, survival can be extended, but without treatment the natural course centers around that few-month range.