Susan G. Komen for the Cure, a breast cancer advocacy group, said it will continue existing grants to Planned Parenthood Federation of America Inc. and is changing its policy on investigations of groups it supports. “Our original desire was to fulfill our fiduciary duty to our donors by not funding grant applications made by organizations under investigation,” Nancy Brinker, the chief executive officer of Komen, said in a statement today. “We will amend the criteria to make clear that disqualifying investigations must be criminal and conclusive in nature and not political. That is what is right and fair.”