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As with breast cancer, HER2 amplification in MPUC results in a faster growing form of cancer that spreads quickly and has a higher chance of recurrence. The hope is that combating this amplification with trastuzumab, a drug that is effective in HER2 positive breast cancers, will result in effective therapy against bladder cancer. "These findings show it is critical for pathologists to recognize this type of bladder cancer and that providers should be aware of and order the appropriate tests," says John Cheville, M.D., a Mayo Clinic pathologist and lead author of the study. …