The analysis of overall survival (OS), a key secondary endpoint of the study, is event driven.
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Dr. Perez and other experts noted that neither study has yet shown an improvement in overall survival.
Both Xtandi and Zytiga, which are pills, have similar overall survival benefit relative to placebo, and quality-of-life data.
Still, given the lack of an overall survival benefit, it might stay in the high 50s for some time.
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The study showed comparable overall survival rates between patients treated with the NovoTTF-100A System and those who underwent chemotherapy.
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The overall survival rate of conjoined twins is somewhere between 5% and 25%.
Overall survival was similar between the XGEVA and placebo groups (secondary endpoint).
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Although the results were not positive for overall survival, there were some signs the drug did shrink tumors or prevent them from growing.
The median overall survival two years after starting treatment was 23.3 months for Xeloda and Tykerb and had not been reached for patients in the T-DM1 group.
"Right now we really don't have an explanation for why we saw response rate but we didn't see any overall survival benefit, " says Genentech spokeswoman Colleen Sweeney .
The two-year overall survival is about 6 to 8 percent.
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While the drug combo did meet the first goal of increasing progression-free survival, it failed to prolong overall survival beyond what is normal for patients on chemotherapy without Erbitux.
Dr Sarah Walters, lead author from the Cancer Research UK Cancer Survival Group at the London School of Hygiene and Tropical Medicine, said the reasons for low overall survival in the UK and Denmark were different and needed different solutions.
The study was designed to measure progression-free survival, which is a measurement of the time from the start of treatment until the disease gets worse or the patient dies, and overall survival, which is a measurement of time from the start of treatment until death.
As in late-stage colon cancer, overall median survival was extended by only a few months.
This new evidence shows that it could also improve overall chance of survival.
This suggests that lower overall breast cancer survival in the UK is not because women are being diagnosed at a later stage than in other countries, the study says.
Overall footprint and survival rates carried the most weight.
This suggests that low overall breast cancer survival in Denmark - the only country that had not fully implemented a national breast screening programme before 2007 - was due to women being diagnosed at a later stage of disease.
One of the report's lead authors, Professor Michel Coleman, of the London School of Hygiene and Tropical Medicine, said it was important to look at the overall pattern of survival rates to build up a clear picture of what is going on.
But overall the biggest threat to reef survival is climate change.
Overall, the five-year survival rate is only about 5 percent.
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"This suggests that, generally speaking, investment in military modernization aside from specific capabilities considered exigent for party leadership continuity, national survival and defense of critical national interests remains a lower priority overall than economic development for Beijing's leadership, " they wrote.
He must be disappointed too at the overall contribution from the EU, which sees many of its newer members to the east struggling for survival in the economic slowdown.
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