Bioengineered tumors.

Three-dimensional (3D) tumor models generated in vitro using methods of tissue engineering are just starting to show potential for predictive studies of therapeutic targets and screening of anticancer drugs. By mimicking some of the key features of the in vivo tumor environment, these models allow us to grow physiologically relevant tumors and study the initiation, progression and metastasis. Using a recent report on how to engineer bone tumors, we comment on the state-of-the-art in bioengineered bone tumors, with focus on the components required for recapitulating the in vivo milieu of bone tumor development.