| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| pT1a (IA): Tumor limited to one ovary; capsule intact, no tumor on ovarian surface. No malignant cells in ascites or peritoneal washings (TNM category and FIGO stage) (ovary) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor involves ipsilateral parietal (mediastinal, diaphragmatic) pleura. No involvement of the visceral pleura (thoracic mesothelioma) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Melanoma 1.0 mm or less in thickness and level II or III, no ulceration (melanoma of the skin) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor limited to one vocal cord (may involve anterior or posterior commissure) with normal mobility (larynx, glottis) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a (IA): Tumor confined to the vulva or vulva and perineum, 2 cm or less in greatest dimension, and with stromal invasion no greater than 1 mm (TNM category and FIGO stage) (vulva) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor invades lamina propria (gallbladder) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor 2 cm or less in greatest dimension, limited to dermis or 2 mm or less in thickness (carcinoma of skin excluding eyelid, vulva, penis, and melanomas) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor invades lamina propria (esophagus) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor 4 cm or less in greatest dimension, limited to the kidney (kidney) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor more than 0.1 cm but not more than 0.5 cm in greatest dimension (breast) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness) without microscopic extraocular extension (ciliary body and choroid) (uveal melanoma) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor invades lamina propria (stomach) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a (IA): Invasive carcinoma diagnosed only by microscopy. All macroscopically visible lesions (even with superficial invasion) are pT1b/IB (TNM category and FIGO stage) (uterine cervix) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a1 category | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor 5 cm or less in greatest dimension, superficial tumor (extraosseous primitive neuroectodermal tumor/Ewing's sarcoma) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a (IA): Tumor limited to endometrium (TNM category and FIGO stage) (corpus uteri) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor 5 cm or less in greatest dimension, superficial tumor (soft tissue) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a: Tumor limited to the iris (not more than 3 clock hours in size) (iris) (uveal melanoma) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a2 category | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  | 
| pT1a (IA): Tumor limited to one fallopian tube, without penetrating the serosal surface; no ascites (TNM category and FIGO stage) (fallopian tube) | Is a | False | pT1a category | Inferred relationship | Existential restriction modifier |  |