Sirna Therapeutics is opposing an Australian RNAi-related patent obtained by rival Alnylam Pharmaceuticals through its July 2003 acquisition of German RNAi shop Ribopharma, marking at least the second time Sirna has challenged this international intellectual property portfolio.

Alnylam reported the opposition in a filing with the US Securities and Exchange Commission published last week. The filing also provided additional details regarding the company's amended IP deal with the Max Planck Society.

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The US Food and Drug Administration has new guidelines that enable some gene and cell therapies to undergo expedited review, according to the New York Times.

Using gene drives to control invasive species might be too risky, an initial advocate of the approach says.

Researchers have grown tumors in 3D cell cultures to better understand cancer, the Economist reports.

In Science this week: intellectual property experts argue patent battles such as the one over CRISPR are wasteful, and more.