[R] changes in coxph in "survival" from older version?

[Terry Therneau]

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I did realize that there are way more predictors in the model.  My
initial thinking was use that as an initial model for stepwise model
selection.  Now I  wonder if the model selection result is still valid
if the initial model didn't even converge?
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You have 17 predictors with only 22 events.  All methods of "variable
selection" in such a scenario will give essentially random results.
There is simply not enough information present to determine a best
predictor or best subset of predictors.  

Terry Therneau