Once you submit, you don't "cancel". You can choose to not do any secondary applications, but your AMCAS fee is nonrefundable once you submit your application. You are considered a reapplicant if you complete and submit secondary applications to schools, and then only a reapplicant to those schools you have submitted secondaries to. For example, if you don't submit Albany's secondary this year, but DO submit Albany's secondary next year, you are NOT a reapplicant (for Albany). Unless, of course, the schools asks if you have ever applied to ANY medical school (but I don't know of any that ask that question).
Personally, if you submit any secondary applications you may as well just ride it out. Who knows, you might get lucky and get in!