| I 124 mAb 3F8 | iodine I 124 monoclonal antibody 3F8 |
| I 131 | iodine I-131 |
| I 131 MOAB BC8 | iodine I 131 apamistamab |
| I 131 MOAB TNT-1/B | iodine I 131 monoclonal antibody TNT-1/B |
| I-123 MIBG | iodine-123 metaiodobenzylguanidine |
| I-124 anti-PS MoAb PNG650 | iodine I 124-labeled anti-phosphatidylserine monoclonal antibody PGN650 |
| I-124 IAZGP | iodine I 124 iodo-azomycin galactopyranoside |
| I-124-CLR1404 | iodine I 124 phospholipid ether analogue CLR1404 |
| [I-124]-CPD-1028 | iodine I 124 CPD-1028 |
| I-131 L19-SIP | iodine I 131 anti-fibronectin antibody fragment L19-SIP |
| I-131-CLR1404 | iodine I 131 iopofosine |
| I131-MOAB-B1 | iodine I 131-tositumomab |
| I3A | ingenol mebutate |
| I3C | indole-3-carbinol |
| iAPA-DC/CTL | iAPA-based dendritic cells/cytotoxic T lymphocytes |
| IBD | ibudilast |
| IBMFS | inherited bone marrow failure syndrome |
| IBS | irritable bowel syndrome; irritable colon; mucus colitis; spastic colon |
| IBX | ibrexafungerp |
| ICC | inecalcitol |
| ICD | implantable cardioverter-defibrillator |
| ICE | ICE regimen |
| ICG solution | indocyanine green solution |
| IdA | inosine dialdehyde |
| IDC-P | intraductal carcinoma of the prostate; intraductal prostate carcinoma |
| IDEC-Y2B8 | 90Y-ibritumomab tiuxetan; 90Y-Zevalin; yttrium Y 90-ibritumomab tiuxetan |
| Id-KLH | autologous immunoglobulin idiotype-KLH conjugate vaccine |
| IDO peptide vaccine | indoleamine 2,3-dioxygenase peptide vaccine |
| IDOX | 4'-iodo-4'-deoxydoxorubicin |
| IDRF | image-defined risk factor |
| IDV | indinavir sulfate |
| IEN | intraepithelial neoplasia |
| IEP | individualized education plan |
| IFA | incomplete Freund's adjuvant; Montanide ISA-51 |
| IFF | ifosfamide |
| IFN-alfa-1b | Recombinant Interferon Alfa-1b |
| IFNb-MSC | interferon beta-secreting mesenchymal stem cells |
| IFN-G | recombinant interferon gamma |
| iFOBT | fecal immunochemical test; immunoassay fecal occult blood test; immunochemical fecal occult blood test; immunologic fecal occult blood test |
| IGF | insulin-like growth factor; somatomedin |
| IGFR | insulin-like growth factor receptor |
| IgG-RFT5-dgA | RFT5-dgA immunotoxin |
| IgIV | therapeutic immune globulin |
| IGRT | image-guided radiation therapy |
| IL | interleukin |
| IL 13-PE38QQR | cintredekin besudotox |
| IL-1 | interleukin-1 |
| IL-10 | interleukin-10 |
| IL-11 | interleukin-11 |
| IL-12 | recombinant interleukin-12 |
| IL-13 | interleukin-13 |
| IL15 | recombinant human interleukin-15 |
| IL-15N72D/IL-15Ra-Fc | nogapendekin alfa inbakicept-pmln |
| IL-18 | recombinant interleukin-18 |
| IL-1-b | recombinant interleukin-1-beta |
| IL-1B | IL-1-beta; interleukin-1-beta |
| IL-2 | recombinant interleukin-2 |
| IL-2 LIPO | liposomal interleukin-2 |
| IL-3 | recombinant interleukin-3 |
| IL-4 | binetrakin; interleukin-4 |
| IL4-PE | bizaxofusp |
| IL-5 | interleukin-5 |
| IL-6 | interleukin-6 |
| IL-7 | lymphopoietin-1; recombinant interleukin-7 |
| IM | intramuscular |
| IMC-1121B | anti-VEGFR-2 fully human monoclonal antibody IMC-1121B; Cyramza; ramucirumab |
| IMC-A12 | cixutumumab |
| IMMU-106 | hA20; veltuzumab |
| IMMU-110 | milatuzumab |
| IMQ | imiquimod |
| IMREG-1 | IMREG 1 |
| IMRT | intensity-modulated radiation therapy |
| In 111 MoAB Hu3S193 | In 111 monoclonal antibody Hu3S193 |
| IND | experimental drug; investigational agent; investigational drug; investigational new drug |
| INDI | indicine-N-oxide |
| indium In 111-labeled autologous PBMCs | indium In 111-labeled autologous peripheral blood mononuclear cells |
| indium In 111-labeled autologous PMNLs | indium In 111-labeled autologous polymorphonuclear leukocytes |
| INDO | indomethacin |
| INH | isoniazid |
| injectable APS | injectable Astragalus membranaceus polysaccharide |
| iNKT | invariant natural killer T cells |
| INS316 | uridine 5-triphosphate solution; UTP solution |
| iodine I 124 PUH71 | iodine I 124-labeled HSP90 inhibitor PUH71 |
| iodine I 131 MOAB G250 | iodine I 131 chimeric monoclonal antibody G-250 |
| IORT | intraoperative radiation therapy |
| IOUS | intraoperative ultrasound |
| IP | intraperitoneal |
| IP6 | inositol hexaphosphate; phytic acid |
| IPM-lysine | palifosfamide |
| IPV | inactivated poliovirus vaccine |
| Ir-192 | iriduim Ir 192 |
| IRB | Institutional Review Board |
| ISS-ODN SD-101 | TLR9 agonist SD-101 |
| ITD | internal tandem duplication |
| IT-DFO | intrathecal deferoxamine |
| ITP | idiopathic thrombocytopenic purpura; immune thrombocytopenia; immune thrombocytopenic purpura |
| IU | International Unit |
| IUD | intrauterine device |
| IUdR | idoxuridine |
| IV | intravenous |
| IV NEPA FDC | fosnetupitant/palonosetron hydrochloride |
| IVF | in vitro fertilization |
| IVIG | intravenous immunoglobulin |
| IVP | intravenous pyelogram; intravenous urogram |
| IVU | intravenous pyelogram; intravenous urogram |