Hi doctor. My mother is suffering from severe pain in lower back that intensifies and spreads to her ribs during night. She has long medical history. She had been treated for breast cancer in 2013. With surgery followed by chemo, radiation and nonsteriodal medicine of valodex 20 mg. Then again in 2018 she developed metastatic cancer in her lower back near spine. The treatment of which started with radiations followed by hormone therapy which is still going on. Our oncologist had prescribed her letroz 2.5 mg.gabapin 300 mg. Shelcal 500 mg. Apart from it she has taken one cycle of palbociclib. But due to its very high cost and our non-affordability towards it we have to discontinue it. She has been diagnosed with pet ct scan several times but results were always good. With disease still growing in body. So my question to doctor is that. Whether we should perform mri scan for assessment of cause of pain. Or it may be cancer redeveloping. Which could be recognized by biopsy test. Followed by radiation therapy as in the case like in 2018 after which she felt alot relief. From similar pain. Or we should only continue with our hormone therapy including ribociclib. Ie alternative cheaper medicine suggested by our Dr. against palbociclib. And one thing. She is taking zoledronic acid inj every month as prescribed by our doc for protection of bones from osteoporosis and cancer. Which is postponed by every 3 months by doc. On examining the good pet scan reports. So please guide me doc. What treatment strategy should I adopt to get her well.