Ethnic Inequalities in Cancer Diagnosis – What’s Really Causing the Delays?

As a profession when we look at improving cancer care and making earlier diagnoses, we tend to focus on either patient factors like lifestyle, occupation or genetics, or on tumour biology. The differences seen between diagnosis and survival in UK Asian and Black ethnic minority groups have been attributed to these variables and their impact on poorer cancer awareness, low screening uptake and delayed medical help-seeking. This paper in the BJGP makes us rethink this narrative by identifying delays that occur after the patient presents, and which are notably longer for those from certain ethnic groups. 

The study used data from over 70,000 patients in England. Across seven common cancer types, researchers found that Black and Asian patients experience significantly longer waits for diagnosis than their White counterparts — and not just in primary care.

The huge focus on making earlier diagnosis in primary care means that most interventions have also been targeted there. Relative delays in secondary care have received much less attention. The study initially hypothesised that diagnostic delays among ethnic minority groups would largely be due to the primary care interval — the time between first presenting symptoms and referral to a specialist. However, the results told a more complex story.

For most cancer types, the delays extended beyond the GP surgery and into the referral and specialist care stages. In fact, secondary care delays were the main contributor to ethnic disparities in four of the seven cancers studied. These included prostate and colorectal cancer — two of the most commonly diagnosed cancers in the UK.

While patient factors still play a role in delayed diagnosis, this study shows that system-level issues — like how quickly patients are referred and seen by specialists — may be equally, if not more, important. In breast cancer, for example, Black women were less likely to be referred via the urgent "two-week wait" route, possibly because their symptoms were less typical (e.g., presenting with pain instead of a lump). In prostate cancer, ethnic differences weren’t seen in the initial GP assessment but became apparent once patients entered the hospital system.

Early diagnosis is key to improving cancer outcomes. The study found that delays of more than two months — a common experience for patients with colorectal, myeloma, and lung cancer — are linked with worse survival rates. For ethnic minorities, consistently longer delays across various parts of the care pathway may partly explain observed differences in survival rates.

This research highlights a crucial need to look beyond patient behaviour and focus more on how healthcare systems respond to minority patients. Are GPs equally likely to refer ethnic minority patients urgently? Do hospital pathways delay diagnosis unintentionally? The answers could help close the gap in cancer outcomes. The authors call for more studies to understand the root causes of these disparities and to guide interventions — particularly in secondary care — where attention has traditionally been lacking.

In a healthcare system designed to serve everyone equally, these findings serve as a wake-up call: equity in access doesn’t always mean equity in outcome.