The calculator in question is the TNM Classification for Exocrine Pancreatic Cancer. TNM stands for Tumor, Node, Metastasis, a system used to classify the extent of cancer spread. This specific classification is used for patients diagnosed with exocrine pancreatic cancer.

The TNM Classification for Exocrine Panicreatic Cancer is used to stage the disease, which is crucial for determining the most appropriate treatment plan and predicting patient prognosis. The 'T' in TNM refers to the size and extent of the main tumor, 'N' refers to the number of nearby lymph nodes that have cancer, and 'M' refers to whether the cancer has metastasized (spread) to other parts of the body.

This classification system is not applicable to patients with endocrine pancreatic cancer or other types of cancer. It is also less useful in cases where the cancer is inoperable or the patient is not a candidate for surgery due to other health conditions.

TNM classification for exocrine pancreatic cancer

# Criteria
 ## Tumor classification
A. Tx: Primary tumor cannot be assessed
B. T0: No evidence of primary tumor
C. Tis: Carcinoma in situ; this includes high-grade pancreatic intraepithelial neoplasia (PanIn-3), intraductal papillary mucinous neoplasm with high-grade dysplasia, intraductal tubulopapillary neoplasm with high-grade dysplasia, and mucinous cystic neoplasm with high-grade dysplasia
D. T1: Tumor <= 2 cm in greatest dimension (T1a: <= 0.5 cm; T1b: > 0.5 and < 1 cm; T1c: 1-2 cm)
E. T2: Tumor > 2 cm but <= 4 cm in greatest dimension
F. T3: Tumor > 4 cm in greatest dimension
G. T4: Tumor involves celiac axis, superior mesenteric artery, and/or common hepatic artery, regardless of size
## Lymph node classification
H. Nx: Regional lymph nodes cannot be assessed
I. N0: No regional lymph node metastasis
J. N1: Metastasis in 1-3 regional lymph nodes
K. N2: Metastasis in >= 4 regional lymph nodes
## Metastasis classification
L. M0: No distant metastasis
M. M1: Distant metastasis

# Conditions
- D and I and L
- F and I and L
- E and I and L
- (D and J and L) or (E and J and L) or (F and J and L)
- (D and K and L) or (E and K and L) or (F and K and L) or (G and L and (H or I or J or K))
- (A or B or C or D or E or F or G) and (H or I or J or K) and M
- true