If you have 2x1cm tumor on the breast the nipple should have been inverted by now with that size of the tumor right??

As below: Nipple inversion in breast cancer usually occur if the tumor location is subareolar [below the areola] or central tumors. Nipple inversion in such a case tends to be asymmetric & distorts areola. Usually nipple inversion is more related to the location of the tumor than size. However larger size can well expand to central/subareolar locations.

No: To be honest I'm not entirely certain of your question, but if you're asking if a 2cm tumor will always cause nipple inversion- the answer is no. I don't know of any correlation between tumor size and nipple inversion. Furthermore, breast cancer doesn't necessarily follow a rule book, and sometimes does strange things. Hope this helps.