Ethnic differences in the characteristics of patients with newly diagnosed lung cancer in the Te Manawa Taki region of New Zealand.

BACKGROUND:Māori have three times the mortality from lung cancer compared with non-Māori. The Te Manawa Taki region has a population of 900 000, of whom 30% are Māori. We have little understanding of the factors associated with developing and diagnosing lung cancer and ethnic differences in these characteristics. AIMS:To explore the differences in the incidence and characteristics of patients with newly diagnosed lung cancer between Māori and non-Māori. METHODS:Patients were identified from the regional register. Incidence rates were calculated based on population data from the 2013 and 2018 censuses. The patient and tumour characteristics of Māori and non-Māori were compared. The analysis used Χ2 tests and logistic models for categorical variables and Student t tests for continuous variables. RESULTS:A total of 4933 patients were included, with 1575 Māori and 3358 non-Māori. The age-standardised incidence of Māori (236 per 100 000) was 3.3 times higher than that of non-Māori. Māori were 1.3 times more likely to have an advanced stage of disease and 1.97 times more likely to have small cell lung cancer. Māori were more likely to have comorbidities, chronic obstructive pulmonary disease, cardiovascular disease and diabetes. They also had higher levels of social deprivation and tended to be younger, female and current smokers. CONCLUSIONS:The findings point to the need to address barriers to early diagnosis and the need for system change including the need to introduce a lung cancer screening focussing on Māori. There is also the need for preventive programmes to address comorbidities that impact lung cancer outcomes as well as a continued emphasis on creating a smoke-free New Zealand.