Among the runners in this weekend's Ealing Half Marathon is a woman literally running for her own life.
Sarah Illingworth, 51, is fundraising for Breakthrough Breast Cancer after having fought the disease once in her 30s, before finding herself once again battling the big C more than a decade later.
Having been treated for breast cancer, she chides herself for not spotting the disease when it returned in 2011.
She said: Id been feeling really tired and run down, but put it down to being fat, unfit and fast approaching 50.
Blood tests swiftly confirmed anaemia, and further scans revealed that 13 years on, the breast cancer had spread through her bones and bone marrow, and through her lymphatic system.
She continued: It was like being hit with a sledge hammer. Having assumed Id been cured, I had to get my head around the real chance that I wouldnt be alive for very long.
Extensive surgery, radiotherapy, monthly infusions to strengthen her bones and daily medication have all taken their toll on Sarahs body, but so far, they are keeping the disease at bay.
Metastatic breast cancer is incurable, with the best hope stopping it from spreading any further, but Mrs Illingworth is this time facing a terminal diagnosis.
She said: Its still really hard work, but I love the sense of purpose it gives me and I feel pride each time I finish a run. This will be the furthest Ive ever run. Having grown up in Osterley, Im really lookin forward to being back in Ealing. Im hoping that theyll find something that will halt my disease before it halts me - quite literally running for my life.
Sarahs husband John, her brother Vaughan and her sister in law, Anna, are all donning their trainers to support her on the run and in her fundraising for Breakthrough Breast Cancer
To sponsor them, visit www.justgiving.com/hippo-squirrel
For more information about breast cancer, visit www.breakthrough.org.uk.