| Abbreviation | Definition |
|---|---|
| CIDC | Cancer Immunologic Data Commons |
| CIDT | Cancer Information Data Trust |
| CIIC | Cancer Immunology and Immunotherapy Center |
| CIIC | Cancer Immunology and Immunotherapy Centre |
| CIL | Cancer Innovation Laboratory |
| CIMAR | Cancer Incidence and Mortality Across Regions |
| CIMW | Cancer Induced Muscle Wasting |
| CINJ | Cancer Institute of New Jersey |
| CIP | Cancer Imaging Program |
| CIRCS | Central integrated Regional Cancer Service |
| CISS | Cancer Information and Support Services |
| CITN | Cancer Immunotherapy Trials Network |
| CIVA | Carcinomas In Villous Adenomas |
| CIVIC | Clinical Interpretations of Variants in Cancer |
| CKCC | California Kids Cancer Comparison |
| CKCC | Central Kansas Cancer Center |
| CKN | Cancer Knowledge Network |
| CLAN | Cancer Link Aberdeen and North |
| CLCI | Campagne de lutte au cancer infantile |
| CLIC | Cancer and Leukaemia in Childhood |