| Abbreviation | Definition |
|---|---|
| ILCA | International Liver Cancer Association |
| IMCR | Institute of Molecular Cancer Research |
| INCA | International Neuroendocrine Cancer Alliance |
| INCP | Integrated Network Cancer Program |
| IRIC | Institute for Research in Immunology and Cancer |
| ISCC | International Society for Children with Cancer |
| ISCI | Inova Schar Cancer Institute |
| ISCR | Illinois State Cancer Registry |
| ISCR | Indiana State Cancer Registry |
| ITCC | Innovative therapies for children with cancer |
| IUC | Invasive Urothelial Cancer |
| IUCC | International Union Against Cancer |
| IVAC | Individualized Vaccines Against Cancer |
| JARC | Joint Action on Rare Cancers |
| JBCP | Jordan Breast Cancer Program |
| JCA | Japanese Cancer Association |
| JCAN | Japan Cancer Action Network |
| JCCC | Jonsson Comprehensive Cancer Center |
| JCCF | Jimmy Crabtree Cancer Fund |
| JCCF | Jonsson Cancer Center Foundation |