TABLE A1.

Synonyms Used for Identifying ICI Administration in Structured EHR Tables and Clinical Notes

Drug Class	ICI	ICI Synonyms
Anti–PD-1 antibodies	Nivolumab	nivolumab, bms_986298, opdivo_injection, nivo, bms_936658, optivo, nsc_748726, l01xc17, bms_963558, ono_4538, opdivo, nivolumab_opdivo, bms_936558, mdx_1106, nivolumab_bms, bms_93655801
	Pembrolizumab	pembrolizumab, anti_pd_1_monoclonal_antibody_mk_3475, keytruda_merck, sch_9000475, pembro, mk3476, sch_900475, mk_3475, lambrolizumab, keytruda, merck_3475, mk3475879
	Cemiplimab	cemiplimab, libtayo, regn2810, cemiplimab_rwlc, anti_pd_1_monoclonal_antibody_regn2810
Anti–PDL-1 antibodies	Atezolizumab	atezolizumab, ro5541267, anti_pd_l1_monoclonal_antibody_mpdl3280a, tecentric, l01xc32, tecentriq, mpdl328oa, atezolizumab_(mpdl3280a), rg7446, mpdl3280a, mpdl3280, anti_pd_l1, mdpl3280a
	Avelumab	avelumab, bavencio, msb0010682, anti_pd_l1_monoclonal_antibody_msb0010718c, msb00107, immunoglobulin_g1_lambda1, msb0010718c
	Durvalumab	durvalumab, imfinzi, d10808, medi4736, durvalumab_(medi_4736)
Anti-CTLA4	Ipilimumab	ipilimumab, ipi, bms_734016, mdx_ctla_4, moab_ctla_4, nsc_732442, ipilimumab_yervoy_bms, yervoy, anti_cytotoxic_t_lymphocyte_associated_antigen_4_monoclonal_antibody, mdx_010, mdx_101, monoclonal_antibody_ctla_4, anti_ctla_4_mab_ipilimumab, monoclonal_antibody_mdx_010, cs1002, ibi310

Abbreviations: CTLA4, cytotoxic T-cell lymphocyte-4; EHR, electronic health record; ICI, immune checkpoint inhibitor.