The primary purpose of your participation in this study is to help answer the following
research questions, and not to provide you treatment for your condition.
- To assess how well treatment with pemetrexed works for patients with your type of cancer
- To assess for any side effects that might be associated with pemetrexed.
- To look at the characteristics and levels of certain of your genes and proteins to learn
more about osteosarcoma and how pemetrexed works in your body.