Impact of simultaneous assay, the PCNA, cyclinD1, and DNA content with specimens before and after preoperative radiotherapy on prognosis of esophageal cancer-possible incorporation into clinical TNM staging system

Table 3 Formula for calculation of prognosis index with different indicator factors

Factors	Group	Group value (1)	β (2)	prognosis index (PI)1
Pathological radiation change’s	III/II/I Grades	0/1/2	0.6405	(1)x(2)
Surgical specimens T stage	T1/T2/T3	0/1/2	0.7678	(1)x(2)
Surgical specimens N stage	N0/N1	0/1	1.2957	(1)x(2)
Pre-radiotherapy cyclinD	N/P/SP	0/1/2	0.8434	(1)x(2)
Post-radiotherapy cyclinD1	N/P/SP	0/1/2	0.6538	(1)x(2)
Post-radiotherapy PCNA	low/high expression	0/1	2.0965	(1)x(2)
Post-radiotherapy DNA	I+II Type/III+IV Type	0/1	1.5593	(1)x(2)

Each prognosis indexes were added together.