Effect of COVID-19-related reductions in cancer screening in Native Hawaiians and across urban and rural communities in Hawaii.
Authors: Holcombe Randall F. , Tom Jeff , Morimoto Michael , Wright Elizabeth , Okado Izumi , Su'esu'e Anamalia , Pagano Ian 
Published: September 2021

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Background: The COVID-19 pandemic has disrupted medical care in all areas of the US and had a profound impact on cancer screening, with a concern that this may lead to excess cancer-related deaths over the next decade. There are existing disparities in cancer mortality among rural US residents and Native Hawaiians (NHs) due to access issues, lower socioeconomic status and lack of a sufficient provider workforce. A reduction in cancer screening may therefore have an oversized impact on these populations. In this study, we examine the effects of the COVID-19 pandemic on cancer screening frequency among NHs and in urban and rural populations in Hawaii. Methods: De-identified data on the frequencies of breast cancer (BCS), cervical cancer (CCS) and colorectal cancer (CRCS) screenings for 2019 and 2020 were obtained for Hawaii residents from several sources, including Hawaii Medical Services Association, the largest private and Medicaid provider in Hawaii, and the two largest state-wide health systems, Queen’s Health Systems and Hawaii Pacific Health. Data was analyzed using Rural-Urban Continuum Codes (RUCC) and Rural-Urban Commuting Area (RUCA) codes to define rurality and, along with health system facility location, to ascertain whether there was a differential impact on cancer screening rates for rural populations due to the pandemic. Cancer screening data for NHs in comparison to other groups was analyzed separately. Results: Overall, reductions in cancer screening during the pandemic were seen, with the degree of reduction varying widely across regions of the state and among different ethnic populations. Annual reductions in BCS, CCS and CRCS ranged from 4.0-30.2%, 2.7-3.0% and 9.4-13.2%, respectively, depending on the data source. BCS reductions were greatest in rural areas (p = 0.09) and among NHs (p = 0.0005). The island of Kauai, which is rural but was minimally affected by COVID-19, saw no reduction in BCS. CCS reductions had a reverse urban vs. rural pattern, with reductions of 4.5% urban and 0.8% rural (p = 0.02). CRCS reductions were most profound in rural residents (17.1%; p = 0.0001); reductions in CRCS among NHs were 1.5x greater than other groups. The differential impact across urban and rural areas was consistent for both RUCC and RUCA analysis. The extent of reduction was most significant for CRCS and was directly proportional to the degree of rurality. Conclusions: BCS and CRCS were impacted more significantly by the COVID-19 pandemic than CCS. For BCS and CRCS, greater reductions were seen in rural compaed to urban populations and in NHs. The lack of correlation with rurality for CCS may be because this population is generally younger and screening is often provided as a component of primary care. The greater pandemic-related reduction in screening among rural residents and Native Hawaiians may exacerbate existing cancer mortality disparities in these vulnerable populations.