. 2015 Feb 4;6(1):56–74. doi: 10.4338/ACI-2014-10-RA-0087

Table 1.

The criteria used in the decision steps of the model formed with patient data and their levels.

The First Decision Step
1) Stage of the disease (TNM)^*	T1 N0 M0
	T2 N0 M0
	T3 N0 M0
	T4 N0 M0
	T1 N1 M0
	T2 N1 M0
	T3 N1 M0
	T4 N1 M0
	T1 N2 M0
	T2 N2 M0
	T3 N2 M0
	T4 N2 M0
	T1 N0 M1
	T2 N0 M1
	T3 N0 M1
	T4 N0 M1
	T1 N1 M1
	T2 N1 M1
	T3 N1 M1
	T4 N2 M1
	T1 N2 M1
	T2 N2 M1
	T3 N2 M1
	T4 N2 M1
2) Location of the tumor	Lower
	Middle
	Upper
3) Coexisting disease or pathology	Present
	•DM^a
	• DM+HT^b
	•DM+CAD^c
	• DM+CAD+HT+Other
	• DM+COPD^d
	•DM+COPD+HT
	• HT
	• HT+Other
	• HT+CLF^e
	•CAD
	• CAD +HT
	• CKF^f
	• COPD
	• COPD+HT
	•COPD+CAD
	• CLF
	• Other
	Absent
4) Invasion of adjacent organs	Present
4) Invasion of adjacent organs	Absent
5) Surgeon’s experience	Lower than 20
5) Surgeon’s experience	Equal or upper than 20
6) Presence of perforation	Absent
7) Presence of obstruction	Absent
8) Presence of fistula	Absent
The Second Decision Step
1) Stage of disease	Upstage
	Stable
	Downstage
2) Invasion of adjacent organs	Present
2) Invasion of adjacent organs	Absent
3) Lymph invasion	Present
	Absent
	Nonassessable
4) Perineural invasion	Positive
	Negative
	Nonassessable
5) Vascular invasion	Present
	Absent
	Nonassessable
6) Patient’s age	0–80
6) Patient’s age	Above 80
7) Resection margin status	R0
	R1
	R2
8) Presence of perforation	Absent
9) Presence of obstruction	Absent
10) Availability of treatment	Accessible

*TNM is an international staging system for cancer. The grade of T expresses tumor size and extensions, N stands for the level of nodal invasion, M stands for the presence or absence of metastases.

^aDM: Diabetes mellitus;

^bHT: Hypertension;

^cCAD: Coronary artery disease;

^dCOPD: Chronic obstructive pulmonary disease;

^eCLF: Chronic liver failure;

^fCKF: Chronic kidney failure;