Second line treatment

https://www.verywellhealth.com/definition-of-first-line-treatment-2249101

Cancer treatment can be very complex 

You really need to speak speak to your oncologist who is familiar with why they placed you on those drugs , why they’ll change your treatment regime and what if any options you have based on your current disease and it’s extent

 . My understanding is that there isn’t a straight answer as it depends on several variables .