Stage C Prostate Cancer

A set of 146 patients with stage C prostate cancer, from a study exploring the prognostic value of flow cytometry.

data(stagec)

Format

A data frame with 146 observations on the following 8 variables.

pgtime: Time to progression or last follow-up (years)
pgstat: 1 = progression observed, 0 = censored
age: age in years
eet: early endocrine therapy, 1 = no, 2 = yes
g2: percent of cells in G2 phase, as found by flow cytometry
grade: grade of the tumor, Farrow system
gleason: grade of the tumor, Gleason system
ploidy: the ploidy status of the tumor, from flow cytometry. Values are diploid, tetraploid, and aneuploid

Details

A tumor is called diploid (normal complement of dividing cells) if the fraction of cells in G2 phase was determined to be 13% or less. Aneuploid cells have a measurable fraction with a chromosome count that is neither 24 nor 48, for these the G2 percent is difficult or impossible to measure.

Examples

require(survival)
#> Loading required package: survival
rpart(Surv(pgtime, pgstat) ~ ., stagec)
#> n= 146 
#> 
#> node), split, n, deviance, yval
#>       * denotes terminal node
#> 
#>  1) root 146 192.111100 1.0000000  
#>    2) grade< 2.5 61  44.799010 0.3634439  
#>      4) g2< 11.36 33   9.117405 0.1229835 *
#>      5) g2>=11.36 28  27.602190 0.7345610  
#>       10) gleason< 5.5 20  14.297110 0.5304115 *
#>       11) gleason>=5.5 8  11.094650 1.3069940 *
#>    3) grade>=2.5 85 122.441500 1.6148600  
#>      6) age>=56.5 75 103.062900 1.4255040  
#>       12) gleason< 7.5 50  66.119800 1.1407320  
#>         24) g2< 13.475 24  27.197170 0.8007306 *
#>         25) g2>=13.475 26  36.790960 1.4570210  
#>           50) g2>=17.915 15  20.332740 0.9789825 *
#>           51) g2< 17.915 11  13.459010 2.1714480 *
#>       13) gleason>=7.5 25  33.487250 2.0307290  
#>         26) g2>=15.29 10  11.588480 1.2156230 *
#>         27) g2< 15.29 15  18.939150 2.7053610 *
#>      7) age< 56.5 10  13.769010 3.1822320 *

Format

Details

Examples

Contents