[R-meta] Meta-Analysis: Proportion in overall survival rate

[ne gic]

Dear Gerta,

Thank you for your reply.

Correct, I want to pool survival proportions (single-arm), not hazard
ratios (comparing two arms).

But you raise some important points and I shall first have to re-evaluate
each study to see if they all adjusted for covariates, and which.

In case of further questions after re-checking them, I shall respond to
this email.

Thanks!

nelly

On Tue, May 19, 2020 at 2:32 PM Gerta Ruecker <ruecker using imbi.uni-freiburg.de>
wrote:

> Dear Nelly,
>
> You could do this, at least in principle, if all proportions refer to
> the same timepoint, for example 5 years. The problem is that the data
> you obtain from studies with a time-to-event endpoint are different from
> those that directly provide a five-year survival proportion: The
> time-to-event analysis accounts for censoring, while the proportion of
> living after five years relatively to all patients at baseline usually
> does not account for censoring or missing data (and thus may
> underestimate the true proportion).
>
> If I understand you correctly, you want to pool survival proportions
> (single-arm), not hazard ratios (comparing two arms).
>
> The technical thing is that you have survival proportions with standard
> error from the time-to-event studies and single proportions (survived/n)
> from other studies. Survival proportions with standard errors can be
> pooled usingthe  generic inverse variance method. Proportions are best
> be pooled using generalized linear models. See, for example, the
> examples for function metaprop() in R package meta.
>
> Best,
>
> Gerta
>
> Am 19.05.2020 um 14:15 schrieb ne gic:
> > Dear List,
> >
> >  From time to event data, it's common to calculate a combined HR for
> > instance from included studies - this I understand.
> >
> > Does it make sense to perform a meta-analysis of the proportion (%) one
> > gets from overall time survival e.g. Overall 5y survival? imagine a
> > scenario where different studies are reporting different proportions of
> > patients surviving at this time point and I want to report a summary
> > proportion from all the studies at this time point.
> >
> > If this is possible, does just collecting the proportion at that time
> point
> > e.g. 5 year suffice as the data to use for this calculation? Or what
> would
> > you suggest? Haven't seen a package that just takes a proportion.
> >
> > Sincerely,
> > nelly
> >
> >       [[alternative HTML version deleted]]
> >
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>
> --
>
> Dr. rer. nat. Gerta Rücker, Dipl.-Math.
>
> Institute of Medical Biometry and Statistics,
> Faculty of Medicine and Medical Center - University of Freiburg
>
> Stefan-Meier-Str. 26, D-79104 Freiburg, Germany
>
> Phone:    +49/761/203-6673
> Fax:      +49/761/203-6680
> Mail:     ruecker using imbi.uni-freiburg.de
> Homepage: https://www.uniklinik-freiburg.de/imbi.html
>
>

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