rebdoniel,
R. Ovadiah Yosef paskens that a gentile may have a therapuetic abortion within the first three months of pregnancy to alleviate a non-fatal illness.
Although some poskim have compared abortion to murder, that analogy just does not fit with our mesorah. For example, Rabbi Shaul Yisraeli, Rabbi Eliezer Waldenberg, Rabbi Joseph Soloveitchik, Rabbi Shlomo Aviner, and Rabbi Levy Yitzhak Halperin all have permitted aborting a fetus with a genetic defect. No Christian pro-lifer would ever countenance such a thing! My wife once referred a patient with an ancephalic fetus for an abortion. It was not even a shilah.