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Re: st: Relative survival using matched controls
From
Adam Olszewski <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Relative survival using matched controls
Date
Mon, 19 Aug 2013 08:55:55 -0400
Hi Katia,
You can make a long table and plot the estimates using the -strs- command or (easier and more elegantly, if you can live without the step curve) plot the relative survival using predictions (usually perfect as long as your N is reasonable) from a flexible parametric model fitted using -stpm2-
stpm2 is available from SSC and strs from pauldickman.com
Hope that helps,
Adam
Sent from my iPhone
On Aug 19, 2013, at 6:45 AM, Katja Maretty Nielsen <[email protected]> wrote:
> Dear all
>
> I'm trying to figure out how to calculate relative survival in cancer patients where I have the "expected survival" as a general population cohort of individually matched controls (5 controls for each cancer patient matched on age and sex at the date of cancer diagnosis).
>
> I have a data set containing the following variables:
>
> idno identification number, unique to each individual
> age age at diagnosis of cancer/index date
> gender
> type type of individual. 1 Cancer patient 2 control
> group number correlating each cancer patient with his/hers 5 individually matched controls
> foll follow up time (years) since diagnosis/indexdate
> status status at end of follow up. 1 dead 2 alive/censored
> com comorbidity according to the charlson index categorized in 3 levels; no, mild, moderate, and severe comorbidity
> diayear year of diagnosis/index year
>
> + some additional prognostic variables for the cancer patients such as stage at diagnosis, tumor size, location of primary tumor etc.
>
> What I would like to do is to produce Kaplan Meier curves for the relative survival, both as overall and for subgroups, e.g., adult patients with non-metastatic disease etc.
>
> I have looked into some of the command such as -strel- and -stexpect-, however these methods seems to be based on population mortality rate tables.
>
> I'm currently using stata version 11.2
>
> Many thanks
>
> Katja Nielsen
>
>
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