In September and October, Cancer Research ran posters in the Tube featuring case studies of people with bowel, breast and lung
cancer. The 'I shouldn't be here' posters were a first for the charity.
While Cancer Research focuses on research, Bowel Cancer UK offers advice and support to sufferers. Brookes claimed similar campaigns to the Tube ads could prevent his charity from reaching its fundraising target.
In response to Brookes' attack, Markham said many people gave equally to cancer research and care charities. He denied that Cancer Research's ads would have a detrimental effect on Bowel Cancer UK's campaign.
The attack comes as Bowel Cancer UK prepares to launch its 'Sit down on it' campaign in the run-up to the Government's nationwide bowel cancer screening programme next April.
'The roll-out of the screening programme will increase the demand for our bowel cancer advisory services. This is an opportunity for us to raise awareness of our work,' said Brookes.
The charity has enlisted Leeds agency Poulters Partners for the campaign, which will include events during Bowel Cancer Awareness month in April.