yup.. u r rite.. saeed.. everything is in Allah(SWT) ' s hands... but he has said tht cure to every disease has also created, only human have to find it out..

"Allah has sent down both the disease and the cure, and He has appointed a cure for every disease, so treat yourselves medically"

"There is no disease that Allah has created, except that He also has created its treatment."

http://wapedia.mobi/en/Medicine_in_medieval_Islam