| Abbreviation | Definition |
|---|---|
| PH | Power of Hydrogen (hydrogen-ion concentration) |
| PHAT | Pleomorphic Hyalinizing Angiectatic Tumor |
| PHC | Primary Hepatocellular Carcinoma |
| PHLA | Post-Heparin Lipolytic Activity |
| PICC | Perspectives In Colorectal Cancer |
| PIE | Post-Irradiation Examination |
| PIOS | Point In Oncogene Synthesis |
| PLB | Primary Lymphoma of Bone |
| PLCO | Prostate, Lung, Colorectal, Ovarian |
| PLL | ProLymphocytic Leukaemia |
| PML | PolyMorphonuclear Leukocytes |
| PNET | Peripheral NeuroEctodermal Tumor (Bone tumors) |
| PNET | Primitive NeuroEctodermal Tumor |
| PNS | Peripheral Nervous System |
| POB | Preventive Oncology Board |
| POCR | Principles of Oncology for Cancer Registry |
| PODP | Provincial Oncology Drug Program |
| POE | Pediatric Oncology Education |
| POETIC | Pediatric Oncology Experimental Therapeutics Investigators Consortium |
| POG | Paramount Oncology Group |