More than 4,000 people have used the Action Cancer Big Bus service since it was launched last year, the charity said today.
This includes thousands of women who have been screened for breast cancer using the hi- tech digital screening equipment, with four new cancers being detected each month.
In its first year, the state-of- the-art mobile cancer screening and health promotion unit has visited more than 200 locations across Ulster.
The facility was launched on September 25, 2006, by Gloria Hunniford whose daughter, Caron, died from breast cancer.
And to celebrate its anniversary, Action Cancer is gearing up for a major fundraising appeal to raise the £1.5m needed to run the facility for the next three years.
Action Cancer corporate fundraising officer, Kerry McCrea, said the Big Bus had become an important community resource.
Throughout next week, Big Bus sponsor SuperValu will be encouraging donations from the public.