I think you have confused some of the terminology. Stage and grade are not the same thing. The grade refers to how well defined the tumor is and how abnormal the tumor cells look under a microscope. The mitotic rate is an estimation of how rapidly those cells are dividing. So a grade 1 tumor with a mitotic rate of 1 is well differentiated and low grade (least aggressive) and dividing very slowly. Stage on the other hand defines to what extent the cancer has spread with stage 1, being completed isolated in a single location within the primary area, stage 2 is more widely spread but is still contained within the primary area, stage 3 means it has spread to surrounding tissue such as skin or lymph nodes, and stage 4 means it has spread to remote tissue or organs. Anyone at any of these stages could have any grade of tumor and mitotic rate.
Assuming that your final pathology with be upon removal of the tumor, the pathology report should reflect the same grade and mitotic rate. However, if the tumor is removed and there are clear margins, tumor grade and mitotic rate would no longer apply.