| Abbreviation | Definition |
|---|---|
| HOPE | Helping Oncology Patients Excel |
| HOPE | Helping Oncology Patients Exercise |
| HOPP | Human Oncology and Pathogenesis Program |
| HOSU | Hematology Oncology Specialty Unit |
| HPV | Human Papilloma Virus |
| HR | High Risk |
| HRT | Hormone Replacement Therapy |
| HTLV | Human T-cell Lymphotropic Virus |
| HTN | Helping The Needy |
| I-131 | Radioactive Iodine |
| IACR | International Association of Cancer Registries |
| IAHO | International Association for Hyperthermic Oncology |
| IAHO | International Association of Hyperthermic Oncology |
| IANO | Irish Association for Nurses in Oncology |
| IARC | International Agency for Research on Cancer |
| IASLC | International Association for the Study of Lung Cancer |
| IASO | Indian Association of Surgical Oncology |
| IBC | Inflammatory Breast Cancer |
| IBS | ImmunoBlastic Sarcoma |
| IC | Infiltrating Carcinoma |