I do not have much to add at all except to say that I know my mom's tumor was tested for it a couple of years ago. I was told it had to do with helping decide what kind of treatment, etc, and not to read much into it.
I know that certain types of LC respond better to chemo. My mom's was a very high grade and we were told that responds better to chemo, whereas my dad's bronchoavelor carcinoma responds better to Tarceva than chemo.
That's my limited knowledge until you get more responses