How often do you have denosumab?


I was diagnosed de novo with secondary breast cancer in July. I have mets in my thoracic spine and have had four x four weekly injections of denosumab. I saw the oncology nurse at clinic this week and she said my oncologist wants to move me from 4 weekly to 12 weekly injections of denosumab. I do not want this because it seems strange to change it after such a short time (3 months) and I have not had any scans to show how effective it is. I have asked for clarification behind his recommendation. 

If you are on denosumab for bone mets, how often do you have injections? 

Thank you.