No, censoring is normal in any Kaplan-Meier curve - it just means they haven't followed the patient for long enough yet (and there has been no event with that patient).
Thus if a patient started the trial only the day before the date of the graph, they would be shown as censored after 1 day.
(Remember K-M graphs pretend everyone starts the trial at the same time).
The other point I would make here is that in the 4th line dataset, the majority of the censored points are well past the median PFS for 4th line placebo (~2 months).
Doesn't absolve the dataset from a lack of reliability, but if one is fairly comfortable with the placebo response in 4th line GIST then it looks decent imo.
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