For PDL1 testing in triple negative breast cancer, is CPS by 22C3 equivalent to SP142 Ventana?

The short answer is that 22C3 is not equivalent to SP142. There are cases that are double-positive but 22C3 positive and SP142 negative cases exist. While benefit from atezolizumab and nab-paclitaxel seems to be seen for SP142 positive breast cancer (based on the results of IMpassion130 trial), the ...