Plural Effustion

I have a question for the lung mets ladies or gentleman out there. I am now on Xeloda because Ibrance/Falsodex failed after 8 months. I will not know this is working for about a month with scans. I have a small plueral effusion that does not cause me any discomfort. I was doing some research and I was stunned to learn that with plueral effusion survival times are 3-12 months??? When I read that on a PUB med study which was done in 2018 I was so shocked because I am sure I have read on these posts that people have lived years. I just hope the Xeloda works and gets rid of the effusion. Thank you in advance, and because I do not see many people on these boards with lung mets I will post this question or reassurance plea on several different topic areas.