| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| T1 (I): Cervical carcinoma confined to uterus | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a (IA): Invasive carcinoma of uterine cervix diagnosed by microscopy only | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a1 (IA1): Tumor of uterine cervix with stromal invasion < 3.0 mm in depth and horizontal spread < 7.0 mm | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a2 (IA2): Tumor of uterine cervix with stromal invasion > 3.0 mm but < 5.0 mm in depth and horizontal spread < 7.0 mm | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b (IB): Tumor of uterine cervix with clinically visible lesion confined to the cervix or microscopic lesion greater than T1a2/IA2 | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b1 (IB1): Tumor of uterine cervix, clinically visible lesion < 4.0 mm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b2 (IB2): Tumor of uterine cervix, clinically visible lesion > 4.0 mm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (I): Endometrial tumor confined to corpus uteri | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a (IA): Tumor limited to endometrium | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b (IB): Endometrial tumor invades up to or less than one half of the endometrium | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1c (IC): Endometrial tumor invades to more than one half of the endometrium | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (I): Tumor confined to vagina | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (I): Tumor limited to fallopian tube(s) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a (IA): Tumor limited to one fallopian tube without penetrating the serosal surface, no ascites | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b (IB): Tumor limited to both tubes without penetrating the serosal surface: no ascites | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1c (IC): Tumor limited to one or both tube(s) with extension into or through the tubal serosa; or with malignant cells in ascites or peritoneal washings: FALLOPIAN TUBE: Salpingectomy | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Clinically inapparent prostate tumor not palpable or visible by imaging | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a: Prostate tumor incidental histologic finding in 5 percent or less of tissue resected | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b: Prostate tumor incidental histologic finding in greater than 5 percent of tissue resected | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1c: Tumor identified by needle biopsy because of elevated prostate specific antigen: PROSTATE: Biopsy/transurethral resection: PROSTATE: Resection | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Aerodigestive tract tumor < 2 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Aerodigestive tract tumor confined to ethmoid with or without bone erosion | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Aerodigestive tract tumor confined to nasopharynx | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to one subsite of hypo-pharynx and < 2 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to one subsite of supraglottis with normal vocal cord mobility | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to subglottis | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to the antral mucosa with no erosion or destruction of bone | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to vocal cord(s) (may involve anterior or posterior commissure) with normal mobility | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a: Tumor limited to one vocal cord | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b: Tumor involves both vocal cords | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Lung tumor 3 cm or less in greatest dimension, surrounded by lung or visceral pleura, without bronchoscopic evidence of invasion more proximal than the lobar bronchus | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Kidney tumor < 7.0 cm in greatest dimension limited to the kidney | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Breast tumor <= 2 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1mic: Microinvasion <= 0.1 cm in greatest dimension: BREAST: Complete excision less than total mastectomy, total mastectomy, modified radical mastectomy, radical mastectomy | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a: Breast tumor >0.1 cm but <= 0.5 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b: Breast tumor >0.5 cm but <= 1 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1c: >1 cm but <= 2 cm in greatest dimension: BREAST: Complete excision less than total mastectomy, total mastectomy, modified radical mastectomy, radical mastectomy | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor invades lamina propria or submucosa | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a: Esophagus/stomach tumor invades lamina propria | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b: Esophagus/stomach tumor invades submucosa | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor invades submucosa (colon/rectum) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to ampulla of Vater or sphincter of Oddi | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to pancreas and < 2 cm in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Urinary tract tumor invades subepithelial connective tissue | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Testicular tumor limited to the testis and epididymis without vascular/lymphatic invasion (tumor may invade tunica albuginea but not tunica vaginalis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (I): Trophoblastic disease confined to uterus | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (IA): Trophoblastic disease confined to uterus with no risk factors | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (IB): Trophoblastic disease confined to uterus with one risk factor | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1 (IC): Trophoblastic disease confined to uterus with two risk factors | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor limited to ipsilateral parietal and/or visceral pleura | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Tumor size < 1 cm, limited to thyroid | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1a (IA): Tumor limited to one ovary, capsule intact, no tumor on ovarian surface | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1b (IB): Tumor limited to both ovaries: capsule intact, no tumor on ovarian surface | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1c (IC): Tumor limited to one or both ovaries with any of the following: capsule ruptured, tumor on ovarian surface, malignant cells in ascites or peritoneal washings: OVARY: Resection | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Aerodigestive tract tumor < 2 cm in greatest dimension without extraparenchymal extension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| T1: Solitary liver tumor < 2 cm; no vascular invasion | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 2 cm or less in greatest dimension (breast) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1b:Tumor >0.5 cm but <= 1 cm in greatest dimension (breast) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades submucosa (colon/rectum) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 3 cm or less in greatest dimension, surrounded by lung or visceral pleura, without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus) (lung) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 2 cm or less in greatest dimension (anal canal) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades lamina propria or submucosa (stomach) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1b: Tumor invades submucosa (stomach) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 7 cm or less in greatest dimension, limited to the kidney (kidney) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to ampulla of Vater or sphincter of Oddi (ampulla of Vater) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Solitary tumor without vascular invasion (liver, including intrahepatic bile ducts) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Cervical carcinoma confined to uterus (extension to corpus should be disregarded) (TNM category and FIGO stage) (uterine cervix) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor confined to corpus uteri (TNM category and FIGO stage) (corpus uteri) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Melanoma 1.0 mm or less in thickness, with or without ulceration (melanoma of the skin) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 2 cm or less in greatest dimension | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor confined to the nasopharynx (nasopharynx) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to one subsite of hypopharynx and 2 cm or less in greatest dimension (hypopharynx) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to one subsite of supraglottis with normal vocal cord mobility (larynx, supraglottis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the vocal cord(s) (may involve anterior or posterior commissure) with normal mobility (larynx, glottis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the subglottis (larynx, subglottis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the maxillary sinus mucosa with no erosion or destruction of bone (maxillary sinus) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor restricted to any one subsite, with or without bony invasion (nasal cavity and ethmoid sinus) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 2 cm or less in greatest dimension without extraparenchymal extension (major salivary glands) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades subepithelial connective tissue (urinary bladder, ureter, renal pelvis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the testis and epididymis without vascular/lymphatic invasion; tumor may invade into the tunica albuginea but not the tunica vaginalis (testis) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the pancreas, 2 cm or less in greatest dimension (exocrine pancreas) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor confined to the retina, vitreous, or subretinal space. No optic nerve or choroidal invasion (retinoblastoma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades lamina propria or submucosa (esophagus) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades lamina propria or submucosa (small intestine) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades lamina propria or muscle layer (gallbladder) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor confined to vagina (TNM category and FIGO stage) (vagina) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor confined to the vulva or vulva and perineum, 2 cm or less in greatest dimension (TNM category and FIGO stage) (vulva) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor confined to the bile duct histologically (extrahepatic bile ducts) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor involves ipsilateral parietal pleura, with or without focal involvement of visceral pleura (thoracic mesothelioma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor confined to uterus (TNM category and FIGO stage) (gestational trophoblast) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor limited to ovaries (one or both) (TNM category and FIGO stage) (ovary) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 2 cm or less in greatest dimension limited to the thyroid (thyroid) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 10 mm or less in greatest diameter and 2.5 mm or less in greatest height (thickness) (ciliary body and choroid) (uveal melanoma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1 (I): Tumor limited to the fallopian tube(s) (TNM category and FIGO stage) (fallopian tube) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor limited to the iris (iris) (uveal melanoma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 5 cm or less in greatest dimension (extraosseous primitive neuroectodermal tumor/Ewing's sarcoma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor 8 cm or less in greatest dimension (osseous primitive neuroectodermal tumor/Ewing's sarcoma) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1: Tumor invades submucosa (appendix) | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1a category | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1c category | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  | 
| pT1mic category | Is a | False | pT1 category | Inferred relationship | Existential restriction modifier |  |