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Drug discovery short-circuits cancer growth

Scientists at the University of California, San Francisco, have created a new drug that blocks cancer's main source of growth and has proven effective in mice. The drug succeeds where similar compounds fail by blocking both mTOR signal pathways, making it a major advance over existing rapamycin-based drugs.

Anti-tumor effects are enhanced by inhibiting 2 pathways rather than 1

Researchers found that simultaneously inhibiting the mTOR and MAPK signaling pathways enhanced antitumor effects in mouse models of prostate and breast cancer. This dual inhibition was particularly effective against aggressive forms of the disease, leading to a potential breakthrough for combination therapy.

JCI table of contents: Aug. 21, 2008

Simultaneous inhibition of two signaling pathways, mTOR and MAPK, resulted in enhanced antitumor effects in mouse models of prostate and breast cancer. This combination therapy may improve the treatment of human cancers, particularly for patients with advanced, hormone-refractory prostate cancer.

Cancer therapy: A role for MAPK inhibitors combined with mTORC1 inhibitors

Research led by Beth Israel Deaconess Medical Center identifies a previously unrecognized problem faced by mTORC1 inhibitors: activating the MAPK pathway, which encourages cancer cell survival. Scientists found that combining mTORC1 and MAPK inhibitors may offer a new treatment option for cancer patients.

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