MacmillanCancerRelief said money must be invested to identify the barriers that are preventing some disadvantaged groups from accessing cancer services.
Replies must be received by December 3, either by completing a newspaper coupon and returning it to a Freepost address, or by visiting the MacmillanCancerRelief website.
The aim of MacmillanCancerRelief is to work towards a system when everyone will have equal and ready access to the best information, treatment and care for cancer.