| Acronym | Definition |
|---|
| IBTR➣Ipsilateral Breast Tumor Recurrence (breast cancer) |
| IBTR➣Indiana Board of Tax Review (Indianapolis) |
| IBTR➣Invasive Breast Tumor Recurrence (cancer) |
| IBTR➣Ipsilateral Breast Tumor Relapse (oncology) |
| IBTR➣Insurance Brokers of Toronto Region (Woodbridge, Ontario, Canada) |
| IBTR➣International Biological Threat Reduction (Sandia National Laboratories) |