Carcinoid syndrome staging

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Parminder Dhingra, M.D. [2]

Staging

Definitions of TNM

The American Joint Committee on Cancer (AJCC) has designated staging by TNM classification to define neuroendocrine tumors:

Neuroendocrine Tumors: Stomach

T	Primary tumor
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
Tis	Carcinoma in situ/dysplasia (tumor size <0.5 mm), confined to mucosa
T1	Tumor invades lamina propria or submucosa and ≤1 cm in size
T2	Tumor invades muscularis propria or >1 cm in size
T3	Tumor penetrates subserosa
T4	Tumor invades visceral peritoneum (serosal) or other organs or adjacent structures
	For any T, add (m) for multiple tumors

N	Regional Lymph Nodes
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Regional lymph node metastasis

M	Distant Metastases
M0	No distant metastases
M1	Distant metastasis

Neuroendocrine Tumors: Duodenum/Ampulla/Jejunum/Ileum

T	Primary tumor
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
T1	Tumor invades lamina propria or submucosa and size ≤1 cmb (small intestinal tumors); tumor ≤1 cm (ampullary tumors)
T2	Tumor invades muscularis propria or size >1 cm (small intestinal tumors); tumor >1 cm (ampullary tumors)
T3	Tumor invades through the muscularis propria into subserosal tissue without penetration of overlying serosa (jejunal or ileal tumors) or invades pancreas or retroperitoneum (ampullary or duodenal tumors) or into nonperitonealized tissues
T4	Tumor invades visceral peritoneum (serosa) or invades other organs
	For any T, add (m) for multiple tumors

N	Regional Lymph Nodes
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Regional lymph node metastasis

M	Distant Metastases
M0	No distant metastases
M1	Distant metastasis

Neuroendocrine Tumors: Colon or Rectum

T	Primary tumor
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
T1	Tumor invades lamina propria or submucosa and size ≤2 cm
T1a	Tumor size <1 cm in greatest dimension
T1b	Tumor size 1–2 cm in greatest dimension
T2	Tumor invades muscularis propria or size >2 cm with invasion of lamina propria or submucosa
T3	Tumor invades through the muscularis propria into the subserosa or into nonperitonealized pericolic or perirectal tissues
T4	Tumor invades peritoneum or other organs
	For any T, add (m) for multiple tumors

N	Regional Lymph Nodes
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Regional lymph node metastasis

M	Distant Metastases
M0	No distant metastases
M1	Distant metastasis

Appendiceal Carcinoids

T	Primary tumor
TX	Primary tumor cannot be assessed
T0	No evidence of primary tumor
T1	Tumor ≤2 cm in greatest dimension
T1a	Tumor ≤1 cm in greatest dimension
T1b	Tumor >1 cm but not >2 cm
T2	Tumor >2cm but not >4 cm or with extension to the cecum
T3	Tumor >4 cm or with extension to the ileum
T4	Tumor directly invades other adjacent organs or structures, e.g., abdominal wall and skeletal muscle

N	Regional Lymph Nodes
NX	Regional lymph nodes cannot be assessed
N0	No regional lymph node metastasis
N1	Regional lymph node metastasis

M	Distant Metastases
M0	No distant metastases
M1	Distant metastasis

Lung Carcinoids

T	Primary Tumor
TX	The primary tumor can’t be assessed, or cancer cells were seen on sputum cytology or bronchial washings but no tumor can be found
T0	There is no evidence of a primary tumor
Tis	The cancer is found only in the top layers of cells lining the air passages. It has not invaded into deeper lung tissues. This stage is also known as carcinoma in situ
T1	The tumor is no larger than 3 centimeters (cm) – slightly less than 1¼ inches – across. It has not reached the membranes that surround the lungs (visceral pleura), and it does not affect the main branches of the bronchi
T1a	The tumor is 2 cm (about 4/5 of an inch) or less across
T1b	The tumor is larger than 2 cm but not larger than 3 cm across
T2	The tumor has 1 or more of the following features:
	It is larger than 3 cm but not larger than 7 cm across
T2a	The tumor is 5 cm or less across but still larger than 3 cm
T2b	The tumor is larger than 5 cm across but not larger than 7 cm
T3	The tumor has 1 or more of the following features:
	It is larger than 7 cm across.
	It has grown into the chest wall, the breathing muscle that separates the chest from the abdomen (diaphragm), the membranes surrounding the space between the lungs (mediastinal pleura), or membranes of the sac surrounding the heart (parietal pericardium)
	It invades a main bronchus and is closer than 2 cm (about ¾ inch) to the carina, but it does not involve the carina itself
	It has grown into the airways enough to cause an entire lung to collapse or to cause pneumonia in the entire lung
	Two or more separate tumor nodules are present in the same lobe of a lung
T4	The cancer has 1 or more of the following features:
	A tumor of any size has grown into the space between the lungs (mediastinum), the heart, the large blood vessels near the heart (such as the aorta), the windpipe, the esophagus (tube connecting the throat to the stomach), the backbone, or the carina
	Two or more separate tumor nodules are present in different lobes of the same lung

Anatomic Stage/Prognostic Groups

Stomach, Duodenum/Ampulla/Jejunum/Ileum, and Colon or Rectum

Stage	T	N	M
0	Tis	N0	M0
I	T1	N0	M0
IIA	T2	N0	M0
IIB	T3	N0	M0
IIIA	T4	N0	M0
IIIB	Any T	N1	M0
IV	Any T	Any N	M1

Appendiceal Carcinoids

Stage	T	N	M
I	T1	N0	M0
II	T2, T3	N0	M0
III	T4	N0	M0
	Any T	N1	M0
IV	Any T	Any N	M1

Residual Tumor (R)

Carcinoma and Carcinoid
R0	Complete resection, margins histologically negative; no residual tumor left after resection.
R1	Incomplete resection, margins histologically involved, microscopic tumor remains after resection of gross disease (relevant to resection margins that are microscopically involved by tumor).
R2	Incomplete resection, margins involved or gross disease remains.