| Abbreviation | Definition |
|---|---|
| C/W | Continue With |
| C1-C7 | Cervical vertebrae (spine eg. C7 = seventh cervical vertebra) |
| Ca | Calcium |
| CA | Cancer Antigen |
| CA | Cancer Associated |
| Ca | Carcinoma |
| CAIS | Cancer Agency Information System |
| CALGB | Cancer And Leukemia Group B |
| CALL | Common Acute Lymphoblastic Leukemia |
| CALM | Clathrin Assembly Lymphoid Myeloid leukemia protein |
| CAPO | Canadian Association of Psychosocial Oncology |
| CARE | Cancer Awareness Resource Environment |
| CARO | Canadian Association of Radiation Oncology |
| CAT | Computerized Axial Tomography |
| CATO | Computer Aided Therapy For Oncology |
| CB | Cancer Board |
| CBT | Carotid Body Tumor |
| CBT | Childhood Brain Tumor |
| CBTR | Children's Brain Tumour Research |
| CBTR | Contralateral Breast Tumor Recurrence |