IBTR
| 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) |