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Stomach (ICD10 C16 - excluding C16.0)

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Introduction

This is the data sheet for TNM 9th edition staging of the stomach (ICD10 C16 excluding C16.0).

For more detailed information regarding TNM staging, please see pages 66-69 of the UICC TNM 9 book.

Stage groupings

Clinical stage*

Stage Group

T stage

N stage

M stage

Stage 0

Tis

N0

cM0

Stage I

T1, T2

N0

cM0

Stage IIA

T1, T2

N1, N2, N3

cM0

Stage IIB

T3, T4a

N0

cM0

Stage III

T3, T4a

N1, N2, N3

cM0

Stage IVA

T4b

Any N

cM0

Stage IVB

Any T

Any N

cM1

Pathological stage*

Stage Group

T stage

N stage

M stage

Stage 0

pTis

pN0

cM0

Stage IA

pT1

pN0

cM0

Stage IB

pT1

pN1

cM0

 

pT2

pN0

cM0

Stage IIA

pT1

pN2

cM0

 

pT2

pN1

cM0

 

pT3

pN0

cM0

Stage IIB

pT1

pN3a

cM0

 

pT2

pN2

cM0

 

pT3

pN1

cM0

 

pT4a

pN0

cM0

Stage IIIA

pT2

pN3a

cM0

 

pT3

pN2

cM0

 

pT4a

pN1, pN2

cM0

 

pT4b

pN0

cM0

Stage IIIB

pT1, pT2

pN3b

cM0

 

pT3, pT4a

pN3a

cM0

 

pT4b

pN1, pN2

cM0

Stage IIIC

pT3, pT4a

pN3b

cM0

 

pT4b

pN3a, pN3b

cM0

Stage IV

Any T

Any N

pM1

Note

*The AJCC publishes prognostic groups for use after neoadjuvant therapy (categories with the prefix ‘y’). If the T or N category is clinical and the other category is pathological, the clinical stage should be used: e.g., pT2cN1 Stage as Clinical stage IIA

TNM clinical classification

T - primary tumour

T value

Description

cTX

Primary tumour cannot be assessed

cT0

No evidence of primary tumour

cTis

Carcinoma in situ: intraepithelial tumour without invasion of the lamina propria, high‐grade dysplasia

cT1

Tumour invades lamina propria, muscularis mucosae, or submucosa

 

cT1a - Tumour invades lamina propria or muscularis mucosae

 

cT1b - Tumour invades submucosa

cT2

Tumour invades muscularis propria

cT3

Tumour invades subserosa

cT4

Tumour perforates serosa (visceral peritoneum) or invades adjacent structuresa,b,c

 

cT4a - Tumour perforates serosa

 

cT4b - Tumour invades adjacent structuresa,b

Notes

aThe adjacent structures of the stomach are the spleen, transverse colon, liver, diaphragm, pancreas, abdominal wall, adrenal gland, kidney, small intestine and retroperitoneum

bIntramural extension to the duodenum or oesophagus is classified by the depth of greatest invasion in any of these sites including stomach

cTumour that extends into gastrocolic or gastrohepatic ligaments or into greater or lesser omentum, without perforation of visceral peritoneum, is T3

N - regional lymph nodes

N value

Description

cNX

Regional lymph nodes cannot be assessed

cN0

No regional lymph node metastasis

cN1

Metastasis in 1 to 2 regional lymph nodes

cN2

Metastasis in 3 to 6 regional lymph nodes

cN3

Metastasis in 7 or more regional lymph nodes

cN3a - Metastasis in 7 to 15 regional lymph nodes

cN3b - Metastasis in 16 or more regional lymph nodes

M - distant metastasis

M value

Description

cM0

No distant metastasis

cM1

Distant Metastasis

Note

Note Distant metastasis includes peritoneal seeding, positive peritoneal cytology, and omental tumour not part of continuous extension

TNM pathological classification

The pT and pN categories correspond to the T and N categories.

pN value

Description

pN0

Histological examination of a regional lymphadenectomy specimen will ordinarily include 16 or more lymph nodes. If the lymph nodes are negative, but the number ordinarily examined is not met, classify as pN0

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Last edited: 16 January 2026 3:55 pm

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Gastrointestinal stromal tumours (gist)

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Small intestine
  1. Cancer staging guidance sheets
  2. Oral Cavity and mucosal lip (ICD10 C00.3-5, C02-C06)
  3. Malignant melanoma of upper aerodigestive tract (ICD10 C00-06, C09-14, C30-32)
  4. Pharynx (ICD10 C01, C02.4, C05.1-2, C09, C10.0, C10.2-3, C10.9, C11-13)
  5. Salivary glands (ICD10 C00-C14, C15.0, C30-C33, C41.1)
  6. Oesophagus including oesophagogastric junction (ICD10 C15, C16.0)
  7. Gastrointestinal stromal tumours (ICD10 C15-C20, C48.1-2)
  8. Stomach (ICD10 C16 - excluding C16.0)
  9. Small intestine (ICD10 C17)
  10. Appendix (ICD10 C18.1)
  11. Colon and rectum (ICD10 C18-C20)
  12. Anal and perianal skin (ICD10 C21)
  13. Liver (ICD10 C22.0)
  14. Intrahepatic bile ducts (ICD10 C22.1)
  15. Gallbladder (ICD10 C23)
  16. Distal extrahepatic bile duct (ICD10 C24.0)
  17. Perihilar bile ducts (ICD10 C24.0)
  18. Ampulla of vater (ICD10 C24.1)
  19. Pancreas (ICD10 C25)
  20. Nasal cavity and paranasal sinuses (ICD10 C30.0, C31.0, C31.1)
  21. Larynx (ICD10 C32.0, C32.1, C32.2, C10.1)
  22. Lung (ICD10 C34)
  23. Thymus tumours (ICD10 C37.9)
  24. Soft tissues (ICD10 C15-C26, C34-C37 C38.1-3, C47-C49, C51-C53, C58, C60-C68)
  25. Bone (ICD10 C40, C41)
  26. Melanoma of skin (ICD10 C00.0-2, C00.6, C21.2, C43, C51, C60, C63.2)
  27. Merkel cell carcinoma of skin (ICD10 C00, C44, C51, C60, 63.2, C80)
  28. Skin carcinoma of the head and neck (ICD10 C00.0-2, C00.6, C44.0, C44.2-4)
  29. Carcinoma of skin of the eyelid (ICD10 C44.1)
  30. Carcinoma of skin (excluding eyelid, head and neck, perianal, vulva and penis) (ICD10 C44.5-7, C63.2)
  31. Pleural mesothelioma (ICD10 C38.4)
  32. Breast tumours (ICD10 C50)
  33. Vulva (ICD10 C51)
  34. Cervix uteri (ICD10 C53)
  35. Uterine sarcomas
  36. Uterus - endometrium (ICD10 C54.1, C55)
  37. Ovarian, fallopian tube and primary peritoneal carcinoma (ICD10 C56, C57, C48.1, C48.2)
  38. Gestational trophoblastic neoplasms (ICD10 C58)
  39. Penis tumours (ICD10 C60)
  40. Prostate tumours (ICD10 C61.9)
  41. Testis tumours (ICD10 C62)
  42. Kidney tumours (ICD10 C64)
  43. Renal pelvis and ureter tumours (ICD10 C65 & C66)
  44. Urinary bladder tumours (ICD10 C67)
  45. Urethra tumours (ICD10 C68.0, C61.9)
  46. Carcinoma of conjuctiva (ICD10 C69.0)
  47. Melanoma of conjuctiva (ICD10 C69.0)
  48. Retinoblastoma (ICD10 C69.2)
  49. Melanoma of uvea (ICD10 C69.3-4)
  50. Carcinoma of lacrimal gland (ICD10 C69.5)
  51. Sarcoma of orbit (ICD10 C69.6)
  52. Thyroid gland (ICD10 C73.9)
  53. Adrenal cortex (ICD10 C74.0)
  54. Adrenal medulla and extra-adrenal paraganglia (ICD10 C74.1 C75.5)
  55. Parathyroid gland (ICD10 C75.0)
  56. Unknown primary - cervical nodes (ICD10 C77.0)
  57. Mycosis fungoides or sezary syndrome (ICD10 C84.0 and C84.1)
  58. T and B cutaneous lymphoma (ICD10, C82.6, C84.8, C86.6 and other C83-C86 if primary skin excluding C84.0 C84.1)
  59. Rhabdomyosarcoma (CTYA)
  60. Chronic lymphocytic leukaemia
  61. Hepatoblastoma (CTYA)
  62. Hodgkins and non-hodgkins lymphoma (ICD10 C81-88)
  63. Medulloblastoma
  64. Multiple myeloma
  65. Neuroblastoma
  66. Neuroendocrine tumours of the foregut
  67. Neuroendocrine tumours of the midgut and hindgut
  68. Non-hodgkin lymphoma (children)
  69. Wilms tumour of the kidney