| Abbreviation | Definition |
|---|---|
| A/O | Age at Onset |
| AA | Anaplastic Anaemia |
| AAC | Antimicrobial Agents and Chemotherapy |
| AACE | American Association for Cancer Education |
| AACR | American Association for Cancer Research |
| AACR | Australasian Association of Cancer Registries |
| AAIR | Age Adjusted Incidence Rate |
| ABC | Activated B Cell |
| ABC | Advanced Breast Cancer |
| ABCC | Ashland Bellefonte Cancer Center |
| ABCCC | Alexian Brothers Cancer Care Center |
| ABCD | After Breast Cancer Diagnosis |
| ABCD | Asymmetry, Border, Color, and Diameter |
| ABCL | Acute Basal Cell Lethality |
| ABMT | Allogenic Bone Marrow Transplantation |
| ABPI | Association of the British Pharmaceutical Industry |
| ABTA | American Brain Tumor Association |
| AC | After Chemo |
| ACB | Alberta Cancer Board |
| ACCC | Association of Community Cancer Centers |