Advanced lobular breast cancer. What is the success rate when a mastectomy, 3rd generation chemotherapy and radiation is done?

Depends. May be good, but need much more detailed information on tumor size, stage, lymph nodes, hormone receptors, etc.Your own oncologist would be in a much better position to help answer this question for you.
Depends. Not enough information. Depends on tnm staging. Treatment decisions based on that as well as biomarkers - er, pr, her2/neu. The absolute risk reduction provided by chemotherapy and/or hormonal therapy can then be individualized. On useful online tool is adjuvant! online. That assumes adequate local control - eg surgery +/- radiation.
Depends . Depends on the amount of spread but can be pretty good if not spread.