Diagnostic and therapeutic methods and compositions...

Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving antigen-antibody binding – specific binding protein...

Reexamination Certificate

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C435S004000, C435S007210, C435S007230, C436S063000, C436S064000, C436S174000

Reexamination Certificate

active

07981618

ABSTRACT:
Patients with ErbB2-overexpressing cancers can be given an ErbB2 targeting agent as a therapeutic regimen but not all patients are responsive. The present invention concerns the diagnostic, prognostic and therapeutic methods and compositions for evaluating potential efficacy of an ErbB2 targeting agent in an ErbB2-overexpressing cancers by evaluating PTEN expression, which is predictive of responsiveness or resistance to ErbB2 targeting agents such as trastuzumab. Low PTEN expression is predictive of a patient who will respond poorly to trastuzumab.

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