Comparison of breast and bowel cancer screening uptake patterns in a common cohort of South Asian women in England

BACKGROUND

Inequalities in uptake of cancer screening by ethnic minority populations are well documented in a number of international studies. However, most studies to date have explored screening uptake for a single cancer only. This paper compares breast and bowel cancer screening uptake for a cohort of South Asian women invited to undertake both, and similarly investigates these women's breast cancer screening behaviour over a period of fifteen years.

METHODS

Screening data for rounds 1, 2 and 5 (1989-2004) of the NHS breast cancer screening programme and for round 1 of the NHS bowel screening pilot (2000-2002) were obtained for women aged 50-69 resident in the English bowel screening pilot site, Coventry and Warwickshire, who had been invited to undertake breast and bowel cancer screening in the period 2000-2002. Breast and bowel cancer screening uptake levels were calculated and compared using the chi-squared test.

RESULTS

72,566 women were invited to breast and bowel cancer screening after exclusions. Of these, 3,539 were South Asian and 69,027 non-Asian; 18,730 had been invited to mammography over the previous fifteen years (rounds 1 to 5). South Asian women were significantly less likely to undertake both breast and bowel cancer screening; 29.9% (n = 1,057) compared to 59.4% (n = 40,969) for non-Asians (p < 0.001). Women in both groups who consistently chose to undertake breast cancer screening in rounds 1, 2 and 5 were more likely to complete round 1 bowel cancer screening. However, the likelihood of completion of bowel cancer screening was still significantly lower for South Asians; 49.5% vs. 82.3% for non-Asians, p < 0.001. South Asian women who undertook breast cancer screening in only one round were no more likely to complete bowel cancer screening than those who decided against breast cancer screening in all three rounds. In contrast, similar women in the non-Asian population had an increased likelihood of completing the new bowel cancer screening test. The likelihood of continued uptake of mammography after undertaking screening in round 1 differed between South Asian religio-linguistic groups. Noticeably, women in the Muslim population were less likely to continue to participate in mammography than those in other South Asian groups.

CONCLUSIONS

Culturally appropriate targeted interventions are required to reduce observed disparities in cancer screening uptakes.

Breast and bowel cancer screening uptake patterns over 15 years for UK south Asian ethnic minority populations, corrected for differences in socio-demographic characteristics

BACKGROUND

A number of studies have reported low uptake of cancer screening programmes by South Asian populations in the UK. However, studies to date have not adjusted findings for differences in demographics and socio-economic status of these populations.

METHODS

SUBJECTS

All residents in Coventry and Warwickshire, UK, eligible for screening. Uptakes compared for round 1 (2000-02) and round 2 (2003-05) of a national bowel cancer screening pilot, and for rounds 1, 2 and 5 of the established NHS breast cancer screening programme (commenced 1989).

DATA

Bowel screening data were analysed for 123,367 invitees in round 1 and 116,773 in round 2 (total 240,140 cases). Breast screening data were analysed for 61,934, 62,829 and 86,749 invitees in rounds 1, 2 and 5 respectively (total 211,512 cases).

ANALYSIS

Screening uptake was compared for two broad meta-categories (South Asian and non-Asian) and for five Asian subgroups (Hindu-Gujarati; Hindu-Other; Muslim; Sikh; South Asian Other). Univariate and multivariate analyses examined screening uptake and various demographic attributes of invitees, including age, gender, deprivation and ethnic group.

RESULTS

South Asians demonstrated significantly lower (p < 0.001) unadjusted bowel screening uptake; 32.8% vs. 61.3% for non-Asians (round 1). Rates were particularly low for the Muslim subgroup: 26.1% (round 1), 21.5% (round 2). For breast screening, a smaller difference was observed between South Asians and non-Asians; initially 60.8% vs. 75.4% (round 1) and later 66.8% vs. 77.7% (round 5). Thus, the disparity reduced gradually over time, alongside an overall trend of increased uptake. However, figures remained consistently low for Muslims (51% in rounds 1 and 5). After adjusting for age, deprivation (and gender), bowel screening uptake remained significantly lower for all South Asian subgroups. After similar adjustments, breast screening uptake remained lower for all subgroups except Hindu-Gujaratis. For Muslims registered with an Asian (vs. non-Asian) GP, bowel screening uptake was significantly lower (p < 0.001). However, breast screening uptake for Muslims with an Asian (vs. non-Asian) GP showed no difference (p = 0.12) in the same period. Colonoscopy and breast assessment uptakes were similar for both meta-categories, but Asian response time appeared slower for colonoscopy. The percentage of abnormal FOBT results was significantly higher for South Asian invitees. A slight increase in abnormal mammograms was observed for Muslims over time (2.7% to 4.2% in rounds 1 and 5 respectively).

CONCLUSION

The lower cancer screening uptakes observed for the South Asian population cannot be attributed to socio-economic, age or gender population differences. Although breast screening disparities have reduced over time, significant differences remain. We conclude that both programmes need to implement and assess interventions to reduce such differences.