The amplified version says, ‘The beginning of the [facts regarding the] good news of Jesus Christ’ and that is completely wrong. The translator of Mark in the amplified version is interpreting matters to his own mind there.
What is the gospel? The term ‘gospel’ is a very special term in the New Testament. It isn’t a synonym for the word of God, or for the truth. Some people use it in that way. There are some people who say, ‘Whenever I preach, whatever book I am preaching from, whatever subject I am taking, I am preaching the gospel.’ Well, that’s not true, because in the New Testament, the gospel refers to the soul-saving doctrines, the message of salvation. If we were to study every time the word gospel is used in the New Testament, we would find that in almost every case the word is used in this context – the preaching of soul-saving doctrines to lost people, coupled with a call to them to repent and be converted. So it is a special term.