Typical size for breast tumor at the beginning and at the end of radiotherapy treatment

Question

I'd like to know if you know about sizes of breast tumors at the beginning and at the end of a typical radiotherapy treatment. I know that standard scheduled (50 Gy in 25 sessions) and hypofractionated (40-42 Gy in 15 sessions) could be used. But for example, in ductal carcinoma in situ or invasive what is the amount of reduction in tumor's size? or with others type of breast cancer. I know that it depends of the patient and other factors, but if you know some information and if it is documented I would thank you so much.