The NET Patient Foundation works with people with neuroendocrine cancer, a rare cancer of the hormonal and nervous systems.
The challenge consists of climbing Snowdon in Wales, Scafell Pike in the Lake District and Ben Nevis in Scotland within a 24-hour period.
Syreeta Boulton, who is part of the team taking on the challenge, said: ‘This is a really rare cancer and we are supporting our friend Leanne Baldry who is currently receiving treatment.’
They are holding a ‘mini Peak challenge’ on May 22, which will involve climbing Kings Vale, Winchester and end at the summit of Butser Hill near Petersfield.
The group have hit their £500 fundraising target, but are looking to raise more.
To make a donation, please go to the JustGiving page at justgiving.com/Syreeta-ThreePeakChallenge2016.