Yondelis/trabectedin

My mom had a sarcoma growth removed along with some of her ribs on 2 occasions. A recent CT scan shows many nodules in her lungs. Her doctor wants to put her on Yondelis/trabectedin. We are not sure if there is any potential benefit to this treatment for her. On the other hand, doing nothing is not an attractive option either. If anyone has any experience with this drug or this cancer, please respond.