Breast cancer drug proposed for bladder cancer patients

Researchers have found amplification of human epidermal growth factor receptor 2 (HER2)—a known driver of some breast cancers—in a type of bladder cancer called micropapillary urothelial carcinoma (MPUC) and have shown that the presence of HER2 amplification is associated with particularly aggressive tumors. These findings suggest that administering trastuzumab to MPUC patients with HER2 amplification could improve outcomes, just as it has for breast cancer.

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 order the appropriate tests,” said lead author John Cheville, MD, a pathologist at the Mayo Clinic in Rochester, Minnesota. “This will be essential for any clinical trial examining the effectiveness of trastuzmab in treating MPUC.”

The study identified HER2 amplification in 15% of patients with MPUC, compared with 9% of typical bladder cancers. Patients with HER2-amplified MPUC were more likely to have aggressive tumors than patients whose tumors did not have HER2 amplification, according to this study. The study is published in Modern Pathology (2014; doi:10.1038/modpathol.2013.201).

“Targeted treatments for HER2-positive breast cancer have led to markedly improved survival,” said Cheville. “In one sense, what we are trying to do with HER2-positive bladder cancer is a relatively simple thing. We are trying to identify prognostic and therapeutic biomarkers, and ultimately match the most effective drug to the individual patient's tumor, rather than its location in the body.”

HER2 is a very important target in breast cancer therapy, and gene amplification occurs in approximately 20% to 30% of cases, said Cheville. Using the latest molecular techniques, researchers in the Mayo Clinic Center for Individualized Medicine's Biomarker Discovery Program determined that some bladder cancers similarly show HER2 amplification and produce too much of the HER2 protein product, resulting in more rapid tumor growth and expansion.

This type of individualized therapy represents the future of cancer care, and many more like this are coming, explained Cheville. Last year, the Biomarker Discovery Program identified and validated 12 different molecular/genomic markers, most of them related to the diagnosis, treatment, and prognosis of a variety of cancers.

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