No, no good or cure will ever come from embryonic stem cell research. Even if something good did come from it, it is still evil:
[quote=Catechism of the Catholic Church]**1789 **Some rules apply in every case: - One may never do evil so that good may result from it;
- the Golden Rule: “Whatever you wish that men would do to you, do so to them.”
- charity always proceeds by way of respect for one’s neighbor and his conscience: “Thus sinning against your brethren and wounding their conscience . . . you sin against Christ.” Therefore “it is right not to . . . do anything that makes your brother stumble.”
Emphasis in underline mine.
[quote=Catechism of the Catholic Church]1756 It is therefore an error to judge the morality of human acts by considering only the intention that inspires them or the circumstances (environment, social pressure, duress or emergency, etc.) which supply their context. There are acts which, in and of themselves, independently of circumstances and intentions, are always gravely illicit by reason of their object; such as blasphemy and perjury, murder and adultery. One may not do evil so that good may result from it.
[quote=Catechism of the Catholic Church]1753 A good intention (for example, that of helping one’s neighbor) does not make behavior that is intrinsically disordered, such as lying and calumny, good or just. The end does not justify the means. Thus the condemnation of an innocent person cannot be justified as a legitimate means of saving the nation. On the other hand, an added bad intention (such as vainglory) makes an act evil that, in and of itself, can be good (such as almsgiving).39
39 Cf. Mt 6:24.
And here is the Scripture verse listed in the footnote for paragraph 1753.
"No one can serve two masters; for either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve God and mammon.
(Matthew 6:24 RSV)