CDCP1 and Alzheimer disease: Six other proteins have been cross‐validated using one method, four (CDCP1, RNAS6, OPG, and Siglec‐7) using cis protein quantitative trait loci data, one (CRDL1) using mass spectrometry, one (SAP3) indirectly from an association between SAP3 and AD observed using mass spectrometry, while one of the 15 proteins (MARCKSL1) remains unvalidated.