We are actually in the process of going completely markless at our center. Although we don’t use marks for our breast patients we still verify medial SSD and light fld daily before treatment. We also move to our table parameters first as a general guideline for setup (every patient for ALL setups are indexed to the table). With these 3 checks along with the accuracy of VRT on breast patients we have concluded marks are no longer needed. If we every have a doubt or question about anything then we film to verify, same as we would if we had marks. If your therapists are on board, then go for it!