Femara PFS rate in metastatic breast cancer

[Prasath_sas]

Hello All,

My Mom was diagnosed with MBC in jan 2017 with Mets to ribs and sternum, As hormone receptor is ER/PR + our oncologist suggested to go with hormonal therapy (Letrozole 2.5 mg). As per the latest PET scan took on May 2018 there is no metabolically active disease anywhere in body and still we are continuing with Femara + Zoldrenic acid (3 months once). Is there any progression free survival rates available while using Femara for MBC. Till how many years we can continue with hormonal therapy and is there any test available to predict disease spread in advance(Ex. Marker test )

[Prasath_sas]

Dear Sumeet sir, it would be very helpful if you respond on above subject

[Prasath_sas]

Dear Sumeet sir, it would be very helpful if you respond on above subject