If the tumor is well differentiated (Stage 1) then surgical excision is much more likely to be curative than if it is moderately differentiated (stage 2) or undifferntiated (stage 3). If this tumor is reported as stage 2 or 3 it is important to do a more complete staging procedure to see whether or not there has been spread of the tumor. Tests might include X-rays of the abdomen and lungs, fine needle aspirate of the regional lymph nodes (or removal and biopsy), fine needle or other biopsy of the spleen and/or liver, general blood chemistry exam and a buffy coat smear of the peripheral blood and bone marrow to search for signs the tumor has metastasized. If may be helpful to consider referral to a veterinary oncologist if that is possible since they are familiar with this testing procedure.