According to nbcnews.com and the Associated Press, Medicare chief Marilyn Tavenner — who oversaw the Obamacare rollout — announced Friday she will step down at the end of February. Tavenner told staff at the Centers for Medicare and Medicaid Services in an e-mail message that she is leaving with "sadness and mixed emotions." Tavenner survived the 2013 technology meltdown of HealthCare.gov, but was embarrassed last fall when she testified to Congress that 7.3 million people were enrolled for coverage. That turned out to be an overcount that exaggerated the total by about 400,000. Calling Tavenner "one of our most esteemed and accomplished colleagues," Health and Human Services Secrerary Sylvia M. Burwell said the decision to leave was Tavenner's. Principal deputy administrator Andy Slavitt will take over as acting administrator.

ImaCor Inc. will be showcasing for the first time Zura EVO1, its all-in-one platform for advanced hemodynamic management, at three annual scientific meetings.

The Society of Interventional Radiology (SIR) unveiled a new brand for the society and its research organization, the SIR Foundation.

Oxford Performance Materials Inc. (OPM) announced the commencement of an extensive joint research program with Yale University to develop innovative and cost-effective 3-D printed biomedical technologies and applications.

Locally advanced rectal cancer patients who receive preoperative radiation therapy with either irinotecan plus capecitabine or oxaliplatin plus capecitabine have a four-year overall survival rate of 85 percent and 75 percent, respectively, according to a study.