| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group |
| Primary carcinoma of vermilion border of upper lip | Is a | True | Primary carcinoma of lip | Inferred relationship | Some | |
| Primary carcinoma of vermilion border of lower lip | Is a | True | Primary carcinoma of lip | Inferred relationship | Some | |
| Primary carcinoma of frenum of lip | Is a | True | Primary carcinoma of lip | Inferred relationship | Some | |
| Primary carcinoma of commissure of lip (disorder) | Is a | True | Primary carcinoma of lip | Inferred relationship | Some |
Reference Sets