When I think of the Sign, Cancer, I think of a warm, nurturing, kind, and gentle spirit. I suppose that deep down, Mike Tyson can be all of those things. However, we hear a much different story from the media. He went to jail for rape, which he still denies. He bit a part of an ear off a boxing opponent. He was a violent and cruel man according to some women, especially his wives.
What in Mike Tyson's birth chart shows such a violent temper, lack of self-discipline, and cruelty? Scorpio Rising, with Uranus conjunct Pluto, the ruler of his chart, involved in a t-square with Mars (co-ruler of Scorpio) in opposition to Moon in Sagittarius. The Mars/Pluto decan of Scorpio can be brutish, if the aspects indicate and these aspects do indicate violence and problems with women as well as his own emotions. He can be despotic, demanding, and explosive when he doesn't get his way.
One could say that Venus 'just missed by a hair' being involved in this t-square (I would consider her a part of it as Venus/Mars=Moon midpoint, however.)
The Moon is in her gibbous phase and 'just missed by a hair' being quincunx the Sun. Gibbous Moon people need to adjust, refine, or edit their emotions in some way.
Mike Tyson 'just missed by a hair' a grand water trine between Jupiter/Neptune/ Chiron and Saturn. Grand trines indicate blessings. Simple trines indicate a gift. Mike Tyson used his Jupiter/Sun trine Neptune to find a religious path while in prison.
Mike Tyson has a t-sextile, talent triangle in his chart which gave him the talent and opportunity to become the champion of the world; it includes the Jupiter/Sun trine Neptune and both sextile Uranus/Pluto. The Sun rules his 10th House of career.
Mike Tyson has been in the news lately because of his daughter's tragic death May 25, 2009 and his 3rd marriage June 10, 2009.
We send Mike Tyson blessings and best wishes in his future years. You can read his biography in WIKIPEDIA.