Many women who have had breast-cancer tumors removed must undergo second operations to catch malignant cells the surgeon missed. But a new tool called the MarginProbe is helping doctors cut the rate of repeat operations in half. WSJ's Lucette Lagnado explains on Lunch Break with Tanya Rivero. Photo: Adam Watt/NYU Langone Medical Center Subscribe to the WSJ channel here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Follow WSJ on Facebook: / wsjvideo Follow WSJ on Google+: https://plus.google.com/+wsj/posts Follow WSJ on Twitter: / wsjvideo Follow WSJ on Instagram: / wsj Follow WSJ on Pinterest: / wsj Don’t miss a WSJ video, subscribe here: http://bit.ly/14Q81Xy More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: / videos On Twitter: / wsj On Snapchat: https://on.wsj.com/2ratjSM