TomoTherapy to Announce First Quarter Financial Results on Tuesday, April 27, 2010

MADISON, WI--(Marketwire - April 19, 2010) - TomoTherapy Incorporated (NASDAQ: TOMO), maker of advanced radiation therapy solutions for cancer care, announced today that it will release its 2010 first-quarter results on Tuesday, April 27, 2010 at 3:00 p.m. CT.

TomoTherapy will hold an investment community conference call on Tuesday, April 27, 2010 beginning at 4:00 p.m. CT. Fred Robertson, M.D., CEO, and Thomas Powell, CFO, will review first-quarter performance and discuss the company’s strategies. To join the conference call, dial 1-866-383-7989 (international 1-617-597-5328) and enter passcode 58209934. A replay of the conference call will be available at 7:00 p.m. CT on April 27, 2010, through 11:59 p.m. CT on May 4, 2010. To access the replay, dial 1-888-286-8010 (international 1-617-801-6888) and enter passcode 87450015.

For individual investors, a live Webcast of the conference call will be available on the Investor Relations page of TomoTherapy.com. Institutional investors can access the Webcast through a password-protected site, www.streetevents.com. An archived Webcast of TomoTherapy’s conference call will be available for two weeks.

About TomoTherapy Incorporated
TomoTherapy Incorporated develops, markets and sells advanced radiation therapy solutions that can be used to treat a wide variety of cancers, from the most common to the most complex. The ring gantry-based TomoTherapy® platform combines integrated CT imaging with conformal radiation therapy to deliver sophisticated radiation treatments with speed and precision while reducing radiation exposure to surrounding healthy tissue. TomoTherapy’s suite of solutions include its flagship Hi Art® treatment system, which has been used to deliver more than three million CT-guided, helical intensity-modulated radiation therapy (IMRT) treatment fractions; the TomoHD™ treatment system, designed to enable cancer centers to treat a broader patient population with a single device; and the TomoMobile™ relocatable radiation therapy solution, designed to improve access and availability of state-of-the-art cancer care. TomoTherapy’s stock is traded on the NASDAQ Global Select Market under the symbol TOMO. To learn more about TomoTherapy, please visit TomoTherapy.com.

©2010 TomoTherapy Incorporated. All rights reserved. TomoTherapy, Tomo, TomoDirect, TQA, Hi Art, TomoHD and the TomoTherapy logo are among trademarks, service marks or registered trademarks of TomoTherapy Incorporated in the United States and other countries.