Brentuximab vedotin, for example, links the chimeric anti-CD30 monoclonal antibody (cAC10) via a protease-cleavable linker to MMAE. This ADC employs a linker system that is designed to be stable in the bloodstream but to release MMAE upon internalization into CD30-expressing tumor cells. This approach is intended to spare non-targeted (healthy) cells and thus reduce many of the toxic effects of traditional chemotherapy while potentially enhancing antitumor activity. (see also vedotins)  Seattle Genetics was founded in 1997, by Clay Siegall, and is headquartered in Bothell, Washington, a suburb of Seattle. The company completed an initial public offering in March 2001, and is traded on the Nasdaq Stock Market under the symbol SGEN. As of December 2016, the company has more than 900 employees throughout the United States. In 2009, when it appeared that ADCETRIS could reach the market, the company realized that commercial skills would need to be grown in-house and/or acquired. This led to a decision to grow a commercial team to address the United States and Canadian markets, and a marketing collaboration with Takeda to cover the rest of the world. By 2018, however, the company was confident it could conduct a global commercialization venture.