Canser y coluddyn yw'r trydydd canser mwyaf cyffredin yng Nghymru, ac mae'n lladd tua 1,000 o bobl bob blwyddyn. Nod Rhaglen Sgrinio'r Coluddyn, sydd ar gael i ddynion a menywod 60 i 74 oed, yw gostyngiad o 15% yn nifer y bobl sy'n marw o ganser y coluddyn yng Nghymru erbyn 2020. Mae nifer y dynion sy'n cael eu sgrinio yn is na nifer y menywod. Mae nifer o ymyriadau ar gyfer dynion wedi cael, neu yn cael, eu treialu a'u gwerthuso. Mae enghreifftiau yn cynnwys: cydweithredu ag Ymchwil Canser y DU; anfon menig a phecyn prawf ar gyfer casglu samplau, a threialu anfon llythyrau esboniadol cyn anfon pecynnau sgrinio’r coluddyn. Ers mis Medi 2015, mae pob dyn wedi cael gwahoddiad cynnar tua phythefnos cyn cael y pecyn prawf. Ar sail tystiolaeth o raglen beilot, roedd pobl a gafodd wahoddiad cynnar yn fwy tebygol o ymateb, yn enwedig dynion.
Bowel cancer is the third most common cancer in Wales and kills around 1,000 people each year. The bowel screening programme, which is available to men and women aged 60 to 74, aims to reduce the number of people dying from bowel cancer in Wales by 15% by 2020. Take-up is lower in men than in women. A number of interventions, targeted at men, have been or are being tried and evaluated – examples include collaborative work with Cancer Research UK; sending out gloves and kits to help collect samples and the trial use of introductory letters before issuing bowel screening kits. Since September 2015, all men have received a pre-invitation letter about two weeks before they get their test kit. Based on evidence from a pilot, people who received a pre-invitation letter were more likely to respond to screening, especially men.