Labour peer Tessa Jowell has been diagnosed with brain cancer, her family has announced.
In a series of posts on social media on her 70th birthday, the former Cabinet minister and her relatives vowed to help other people with the disease.
Daughter-in-law Ella, the food blogger known as deliciouslyella, said Baroness Jowell had been diagnosed in May.
In an Instagram post, she wrote: "The last few months have been some of the hardest of our lives, after Matt's mum was suddenly diagnosed with brain cancer in May.
"Her bravery, optimism, love and support for others during this process has inspired us both so much, and today, on her 70th birthday, we're all pledging to try and do everything we can to make people's lives with cancer better for longer."
The peer later posted on Twitter: "Thank you for so much love and support on my birthday. More people living longer, better lives with cancer is my birthday pledge."
Baroness Jowell was one of the Labour party's best known faces during the Tony Blair era and was hailed as the woman who brought the Olympics back to Britain.