Does MRK prove the truth of the statement that, if you can have[or already have] the initial ability to pre-select the correct patient to treat[e.g., a patient with enough targets to hit with your company's I-O therapy], the company having that initial ability will achieve a better share of successful treatments:
"... Patients enrolled were those who had received no prior systemic chemotherapy treatment for their advanced disease and whose tumors expressed high levels of PD-L1 (defined as a tumor proportion score of 50 percent or more) as determined by a central laboratory using an immunohistochemistry assay...."
Failing that initial ability, Keytruda still likely fails treatment purpose because of low RRRs, w/o assistance from somewhere to overcome those patients' disadvantage.