Cellular reprogramming and induced pluripotent stem cells have allowed scientists to model various diseases and screen drugs in these in vitro models. Cancer is modeled through the generation of...

Cellular reprogramming and induced pluripotent stem cells have allowed scientists to model various diseases and screen drugs in these in vitro models. Cancer is modeled through the generation of induced pluripotent stem cells. Please explain the questions in detail (Especially 2nd and 3rd question please, thank you):
1) why is it important to model such a disease(cancer)?
2) what were the key findings after modeling such a disease (cancer)?
3) a drug that has been screened in this disease model (cancer). Explain in detail the main findings.