The actress, best known as the sarcastic Abby Lockhart in the long-running hit medical drama 'ER', confirmed she had discovered a cancerous tumour in her breast and needed surgery in July 2009.
As a result, Tierney had to leave the new American series 'Parenthood' she was set to star in to undergo treatment.
In a statement Tierney's spokesperson said: "Ms. Tierney and her doctors remain confident that the outcome of her treatments will be positive."
22,000 people agreed to clean toilets for WiFi because they did not read the terms.
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.