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role of PD-L1 expression as a predictive biomarker: an analysis of all US Food and Drug Administration (FDA) approvals of immune checkpoint inhibitors\u003C\/div\u003E  \n      \n    \t\u003Cdiv class=\u0022highwire-cite-metadata bmjj-citation-metadata\u0022\u003E\u003Cspan class=\u0022highwire-cite-metadata-journal highwire-cite-metadata\u0022\u003EJournal for ImmunoTherapy of Cancer \u003C\/span\u003E\u003Cspan class=\u0022highwire-cite-metadata-year highwire-cite-metadata\u0022\u003E2019;\u003C\/span\u003E\u003Cspan class=\u0022highwire-cite-metadata-volume highwire-cite-metadata\u0022\u003E7:\u003C\/span\u003E\u003Cspan class=\u0022highwire-cite-metadata-elocation-id highwire-cite-metadata\u0022\u003E278. \u003C\/span\u003E\u003Cspan class=\u0022highwire-cite-metadata-doi highwire-cite-metadata\u0022\u003E\u003Cspan class=\u0022label\u0022\u003Edoi:\u003C\/span\u003E 10.1186\/s40425-019-0768-9 \u003C\/span\u003E\u003C\/div\u003E\n  \n  \n  \n\u003C\/div\u003E\u003C\/div\u003E  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