In the future we will need even more so than now ethical guidelines in which to structure the use of our technology and our sciences. Our technical expertise is growing faster than our ability to handle it. Because of science we are moving into areas which humans have not explored before. We need the guidelines that ethics can provide. For example in stem cell research, we find those who view the act of harvesting aborted fetuses for use in creating cells for implantation into humans with various infirmities.
Science is a collection of the results of a search for facts about our physical reality.
Ethics is an arbitrary set of rules for behaving in a way that is acceptable to the culture setting forth those rules. Until various cultural societies unify their beliefs, the ethical standards practiced by each might vary considerably. In that regard, Medical Science has the choice to either ignore ethical standards altogether, or try to find an acceptable standard within whatever culture it operates. The latter choice seems the most rewarding probability, since funding for scientific research comes out of the power bases in the cultures which it serves. Differing beliefs within any given discipline can breed chaos.