dr. mangi's lab.experiment using cells derived from jennifer's very own tumor, her mom and dad was once again involved. >> we had this great idea for expensive experiments to test this. libby showed up and says, here's a check why don't you do something good with it. >> so they did. the results were striking. looking for a signal that cancer cells remained after treatment, chris couldn't find one. >> that was the moment, it was a moment that you don't believe in. >> the tumors eradicated, and i haven't seen anything work that wale for this tumor. >> for libby, the news is understandably bittersweet. it comes four years too late for her jennifer, but one day soon, might come just in time for someone else's child. while the tumors were largely eradicated, some cancer cells did remain, so, they hope that maybe some traditional treatment could help completely remove the cancer. they believe they will move into a human trial in 2019. nbc bay area news. >> what's an amazing contribution by that family. >> w

dr. michelle mangy. a pediatric neurooncologist and searcher at stanford university school of medicine.t is why just hours after her death we were in the doctor's lab witnessing the first steps in an ultimately successful attempt to create stem cell lines from her tumor. adding a glimmer of hope in the treatment of a disease that hadn't seen a meaningful advance in the past 50 years. >> jennifer's donation gave us a tool that we didn't have. >> but to use that tool, takes money. and this is where libby and tony come back into the picture. >> and then i just talk about why it is unraveling. >> they started a foundation, unravel, funding pediatric cancer research but not in the traditional way. and so when christopher mount, a graduate student in the lab devised an experiment using targeted immunotherapy against dipg implanted in mice, an experiment using cells derived from her very own tumor -- her mom and dad were once again involved. >> we had this great idea for an expensive set of experiments to really test this. and then libby showed up and said, here is a check. why don't you do so