stagec {rpart} | R Documentation

## Stage C Prostate Cancer

### Description

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

### Usage

    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)
    rpart(Surv(pgtime, pgstat) ~ ., stagec)

[Package rpart version 4.1-0 Index]