In 1959 Dr. Jerome Lejeune discovered the cause of Down's Syndrome.

He committed himself to the pro-life cause when he discovered that children with Down's Syndrome were being aborted in ever greater numbers.

In 1991, he wrote a summary of his reflections on medical ethics:

1. Christians, be not afraid. It is ou who possess the truth. Not that you invented it but because you are the vehicle for it. To all doctors, you must repeat: "you must conquer illness, not attack the patient."

2. We are made in the image of God. For this reason alone all human beings must be respected.

3. Abortion and infanticide are unspeakable crimes.

4. Objective morality exists. It is clear and it is universal.

5. In so-called pluralistic societies, they shout it down our throats: "You Christians do not have the right to impose your morality on others." Well, I tell you, not only do you have the right to try to incorporate you morality in the law but it is you democratic duty.

In 1993, Blessed Poe John Paul, his close friend, appointed Lejeune as the first president of the Pontifical Academy for Life.

French bishops have introduced his cause for canonization.