I know that this statement is a bit of a long shot, but I think that an impression of the enrollment pattern can be obtained by looking at the time points at which the non-PCa-deaths were censored (Dr. Small's presentation from 10/20). These patients were censored because their deaths were unrelated to PCa, therefore, the timing and number of these deaths - together with the likelyhood of being alive at the time of censoring - can give an indication of the enrollment pattern.
I made some rough estimates, and to me it appears as if the last half of the patients were enrolled at a constant rate.
Please have a look at the graph, and let me know if you see my point.
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