cox model test heterogeinity

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cox model test heterogeinity
  I'm a young physician and i work on the breast cancer. I made a cox
     model and i want to do a test of heterogeneity. Do you know how i
     do this with R. I'm sorry for this question wich seems to be easy
     you. I read the manual and the help and i don't find it.
     Thanks for your help
     Bertrand  Billemont

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