For Cancer ascendant Saturn is the most Malefic planet as it rules the 8th house. Now Saturn is posited in the 7th house which is the house of marriage. 8th lord is in the 7th house is never auspicious. It will disturb your marriage life. The second thing is Saturn is in its own house Capricorn, so that will certainly reduce the malefic effects on the 7th house, but having said that the influence will not be a nice one.