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Stratification Design
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Do not use the diagnostic to restrict eligibility, but to structure
a prospective analysis plan
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Having a prospective analysis plan is essential
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“Stratifying” (balancing) the randomization is useful to ensure
that all randomized patients have tissue available but is not a
substitute for a prospective analysis plan
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The purpose of the study is to evaluate the new treatment
overall and for the pre-defined subsets; not to modify or
refine the classifier
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The purpose is not to demonstrate that repeating the
classifier development process on independent data results in
the same classifier