Score of Salomon et al for Predicting Pretherapeutic Seminal Vesicle Invasion in a Patient with Prostate Cancer

 

Parameters:

(1) number of needle biopsies positive for cancer out of 6 sextant biopsies

(2) Gleason score

(3) serum PSA in ng/mL

 

Parameter	Findings	Points
Gleason score	2 to 4	0
	5 or 6	1
	7 to 10	2
serum PSA	<= 10 ng/mL	0
	10.1 - 20 ng/mL	1
	>= 20.1 ng/mL	2

 

where:

• The minimum number of positive needle core biopsies is 1 and the maximum is 6.

 

X =

= (0.67 * (points for Gleason score)) + (1.02 * (points for serum PSA)) + (0.4 * (number of sextant biopsies positive for cancer)) - 4.39

 

risk of seminal vesicle invasion =

= EXP(X) / (1 + EXP(X))