Key Points
Question
What is the contribution of prevention, screening (to remove precursors [interception] or early detection), and treatment interventions to deaths averted in breast, cervical, colorectal, lung, and prostate cancer from 1975 to 2020?
Findings
In this model-based study using population-level cancer mortality data, an estimated 5.94 million deaths were averted from these 5 cancers combined. Prevention and screening accounted for 8 of every 10 averted deaths, and the contribution varied by cancer site.
Meaning
Cancer prevention and screening were main contributors to reducing mortality from these 5 cancers over the past 45 years; further mortality reductions will require increased use of effective interventions and new discoveries.
Abstract
Importance
Cancer mortality has decreased over time, but the contributions of different interventions across the cancer control continuum to averting cancer deaths have not been systematically evaluated across major cancer sites.
Objective
To quantify the contributions of prevention, screening (to remove precursors [interception] or early detection), and treatment to cumulative number of cancer deaths averted from 1975 to 2020 for breast, cervical, colorectal, lung, and prostate cancers.
Design, Setting, and Participants
In this model-based study using population-level cancer mortality data, outputs from published models developed by the Cancer Intervention and Surveillance Modeling Network were extended to quantify cancer deaths averted through 2020. Model inputs were based on national data on risk factors, cancer incidence, cancer survival, and mortality due to other causes, and dissemination and effects of prevention, screening (for interception and early detection), and treatment. Simulated or modeled data using parameters derived from multiple birth cohorts of the US population were used.
Interventions
Primary prevention via smoking reduction (lung), screening for interception (cervix and colorectal) or early detection (breast, cervix, colorectal, and prostate), and therapy (breast, colorectal, lung, and prostate).
Main Outcomes and Measures
The estimated cumulative number of cancer deaths averted with interventions vs no advances.
Results
An estimated 5.94 million cancer deaths were averted for breast, cervical, colorectal, lung, and prostate cancers combined. Cancer prevention and screening efforts averted 8 of 10 of these deaths (4.75 million averted deaths). The contribution of each intervention varied by cancer site. Screening accounted for 25% of breast cancer deaths averted. Averted cervical cancer deaths were nearly completely averted through screening and removal of cancer precursors as treatment advances were modest during the study period. Averted colorectal cancer deaths were averted because of screening and removal of precancerous polyps or early detection in 79% and treatment advances in 21%. Most lung cancer deaths were avoided by smoking reduction (98%) because screening uptake was low and treatment largely palliative before 2014. Screening contributed to 56% of averted prostate cancer deaths.
Conclusions and Relevance
Over the past 45 years, cancer prevention and screening accounted for most cancer deaths averted for these causes; however, their contribution varied by cancer site according to these models using population-level cancer mortality data. Despite progress, efforts to reduce the US cancer burden will require increased dissemination of effective interventions and new technologies and discoveries.
This model-based study using population-level cancer mortality data evaluates the association of prevention, screening, and treatment interventions with cumulative number of cancer deaths averted from 1975 to 2020 for breast, cervical, colorectal, lung, and prostate cancers.
Introduction
Overall US mortality has declined over time for most major cancer sites because of progress in prevention, screening, and treatment. Nevertheless, the reignited Cancer Moonshot goal to reduce the age-adjusted cancer mortality rate by 50% in the next 25 years will not be achieved without accelerating progress.1 A comprehensive plan to reduce cancer mortality includes interventions in cancer prevention, detection, diagnosis, treatment, and survivorship care. As we strive to decrease the burden of cancer, we need to understand which intervention strategies are most effective in reducing deaths from cancer. Past analyses have only evaluated contributions to mortality for individual cancer sites.2,3,4,5,6
We extended models from established Cancer Intervention and Surveillance Modeling Network (CISNET) teams and National Cancer Institute (NCI) collaborators to quantify the relative contributions of prevention, screening (for interception and early detection), and treatment advances to cumulative mortality of 5 cancer sites (breast, cervical, colorectal, lung, and prostate) from 1975 to 2020. Our analysis focused on these 5 cancer sites because they are among the most common causes of cancer deaths, and interventions are available for their prevention, interception and/or early detection, and treatment advances (hereafter referred to collectively as all interventions). The results are intended to provide insights into different approaches needed for varying cancer sites and to highlight gaps and opportunities for future efforts to meet national goals to reduce the US cancer burden.
Methods
In this model-based study using population-level mortality data, we estimated the number of deaths averted, extending prior analyses from CISNET2,3,4,6 and NCI collaborators using Surveillance, Epidemiology, and End Results Program cancer registry mortality rates5,7 and used observed US mortality rates from the National Center for Health Statistics (Supplement 1). Prior analyses were extended to a common timeframe through 2020. CISNET models used a similar approach to estimate cancer mortality and details are available elsewhere and in Supplement 1. The CISNET models simulated multiple birth cohorts from the US population in a given year. Age-specific, period-specific, and cohort-specific cancer incidence-based methods and survival trends were simulated assuming standard care in 1975 (breast, cervical, colorectal, and lung) or 1990 (prostate) continued through 2020. The simulations were repeated overlaying interventions as they disseminated into the population over time to generate cancer-specific incidence and mortality trends. Prevention, screening (for interception and early detection), and treatment advances partially or completely interrupt the development and/or progression of disease (Figure). Prevention and interception were assumed to avoid incident cancer. If cancer developed, mortality was reduced through screening and earlier detection, as survival is improved compared with clinical detection. Treatment advances improved survival, and individuals could die of cancer or other causes. Models varied in specific features and interventions by cancer site (Table 1; eFigures 1-6 in Supplement 1). The previously published research that produced additional outputs for this study was deemed exempt from institutional review board approval. Informed consent was not required because we used publicly available secondary data that were deidentified.
Figure. Opportunities for Averted Cancer Deaths With Prevention, Screening, and Treatment Interventions.

This schematic of cancer progression shows opportunities for prevention, screening (for interception and early detection), and treatment advances to partially or completely interrupt the development and/or progression of disease that would cause death.
Table 1. Summary of Model Features for Each Cancer Site.
| Intervention | Female breast cancer | Cervical cancer | Colorectal cancer | Lung cancer | Prostate cancer |
|---|---|---|---|---|---|
| Prevention | Risk factors not explicitly modeled, aside from their impact on cancer incidence | No | No, although risk factors are included in the model, we did not simulate different risk factor scenarios | Age-specific and gender-specific probabilities of smoking cessation by year vs patterns prior to the 1964 US Surgeon General’s report | No |
| Incidence | Age-specific, period-specific, cohort-specific approach | No | Model was calibrated to match age-specific, sex-specific, race-specific, stage-specific, and location-specific incidence from 1975 to 1979, a period with little to no population screening for colorectal cancer | Individual risk model by age and smoking history; age-specific, period-specific, cohort-specific approach | Individual risk model of longitudinal PSA associated with cancer onset and progression |
| Interception | No | High-grade intraepithelial neoplasia | Adenomatous polyps, where polyp rates are based on population risk factors | No | No |
| Screening | Plain film, digital mammography, and tomosynthesis | Pap smear and HPV testing | Colonoscopy, sigmoidoscopy, stool testing | No | PSA |
| Tumor features | ER/ERBB2 subtypes | No | Adenoma size (1 to <6 mm, 6 to <10 mm, ≥10 mm), cancer stage (TNM) | Histologic characteristics and stage | Grade |
| Survival | Age-specific, stage-specific, and subtype-specific in the absence of systemic therapy | No | Age-specific, sex-specific, race-specific, location-specific, and stage-specific survival by period of diagnosis | Overall age-specific, gender-specific, stage-specific, and histology-specific survival in time periods | Age-specific, stage-specific, and grade-specific with secular improvement in early PSA era |
| Treatment | Systemic endocrine, chemotherapy, and ERBB2-targeted therapy; treatment and treatment effects vary over time periods | No | Trends in the dissemination of chemotherapy agents over time by sex, location, and age group; chemotherapy-specific hazard ratios | Treatment and tobacco control were modeled separately using different approaches; targeted therapy and immunotherapy from 2014 to 2020 | Radiotherapy, surgery, and endocrine therapy (initial and later courses); treatment and treatment effects vary over time periods |
Abbreviations: ER, estrogen receptor; ERBB2, human epidermal growth factor receptor 2; HPV, human papillomavirus; PSA, prostate-specific antigen.
Statistical Analysis
The models projected cumulative cancer deaths averted from 1975 to 2020. For breast, colorectal, and prostate cancer, the models examined annual cancer mortality rates under 4 scenarios.
Scenario 1: no prevention, screening (for interception or early detection), or treatment advances;
Scenario 2: prevention and/or screening only;
Scenario 3:treatment advances only; and
Scenario 4: prevention/screening and treatment advances.
For cervical and lung cancer, not all 4 scenarios were modeled, as described in Supplement 1. Because there is a synergy between interventions (eg, the benefit of screening varies depending on the difference in treatment benefit from early to late-stage diagnosis), our primary outcome was the relative contribution of prevention and/or screening in the presence of treatment advances. We computed cancer deaths averted from prevention and/or screening by calculating the difference in the estimated number of cancer deaths between scenario 4 and scenario 3. Similarly, to estimate cancer deaths averted from treatment advances only, we calculated the difference in the estimated number of cancer deaths between scenario 3 and scenario 1. We computed the percentage of cancer deaths averted from total cancer deaths in the absence of all interventions by dividing by the total cancer deaths in scenario 1. Results for a secondary outcome are provided along with details about the models for each cancer site in Supplement 1.
Results
From 1975 to 2020, an estimated 5.94 million cancer deaths were averted from the combination of prevention, screening (for interception and early detection), and treatment advances (Table 2). Across all interventions combined, prevention and/or screening were estimated to account for 80% of cancer deaths averted (4.75 million), with tobacco control for lung cancer alone contributing 3.45 million of the 4.75 million deaths. The contribution of prevention and/or screening to cancer deaths averted varied across cancer sites. Prevention of lung cancer due to tobacco control accounted for 98% of lung cancer deaths averted and screening accounted for 100% of cervical cancer deaths averted. Prevention and/or screening accounted for 79% and 56% of deaths averted for colorectal and prostate cancers, respectively. In contrast, given the development of very effective therapies for breast cancer over this period, screening was estimated to account for a minority, about 25%, of female breast cancer deaths averted and therapies accounted for the remaining deaths averted. Less than half of total cancer deaths in the absence of all interventions (scenario 1) were averted for each cancer site (Table 2).
Table 2. Cancer Deaths Averted From Prevention and/or Screening, and Treatment Advances vs Counterfactual.
| Intervention, calendar years, and age range considered | Total cancer deaths averted with all interventionsa | Cancer deaths averted, No. (%)a,b | Cancer deaths averted from total cancer deaths in absence of all interventions, % | Total cancer deaths in absence of all interventions (scenario 1) | ||||
|---|---|---|---|---|---|---|---|---|
| Prevention and/or screening in the presence of treatment advances (scenario 4 − scenario 3) | Treatment advances only (scenario 3 − scenario 1) | Prevention and/or screening in the presence of treatment advances (scenario 4 − scenario 3)/scenario 1 | Treatment advances only (scenario 3 − scenario 1)/scenario 1 | |||||
| Female breast cancerc | ||||||||
|
1 030 000 | 260 000 (25) | 770 000 (75) | 10 | 28 | 2 710 000 | ||
| Cervical cancerd | ||||||||
|
160 000 | 160 000 (100) | Negligible | 43 | Negligible | 370 000 | ||
| Colorectal cancere | ||||||||
|
940 000 | 740 000 (79) | 200 000 (21) | 21 | 6 | 3 450 000 | ||
| Lung cancerf | ||||||||
|
3 450 000 | 3 390 000 (98) | 60 000 (2) | 37 | 1 | 9 200 000 | ||
| Prostate cancerg | ||||||||
|
360 000 | 200 000 (56) | 170 000 (44) | 20 | 17 | 1 010 000 | ||
| Total | ||||||||
| All interventions combined | 5 940 000 | 4 750 000 (80) | 1 200 000 (20) | NA | NA | NA | ||
Abbreviations: HPV, human papillomavirus; NA, not applicable; PSA, prostate-specific antigen; USPSTF, US Preventive Services Task Force.
Total deaths averted included prevention and/or screening and treatment advances as indicated. Total may not be a sum of each intervention group alone due to the negative synergy between each. In cancers with effective therapies, screening effects decrease in the presence vs absence of treatment advances. In cancer sites with less effective treatments, the relative screening impact increases in the present vs absence of treatment advances.
Secondary outcome for the contribution of prevention and/or screening without treatment advances is shown in eTables 4 and 5 in Supplement 1 (percentage of cancer deaths averted from total cancer deaths in the absence of all interventions). Numbers may not sum to totals due to rounding.
Estimates of female breast and lung cancer deaths averted are reported as the average across 3 and 2 cancer simulation models, respectively. The breast models include mammography used in year calendar period (plain film, digital, and tomosynthesis) and treatment advances. See details in eTable 1 in Supplement 1.
Cervical cancer model included screening and assumed no impact of treatment advances since survival was unchanged over the study period.
Colorectal cancer model included colonoscopy, sigmoidoscopy, and stool testing, removal of adenomatous polyps, and chemotherapy. See details in eTable 2 in Supplement 1.
Treatment advances and tobacco control were modeled separately using different approaches. Treatment advances focused on the modern era from 2014 to 2020 and included all ages. Because the treatment analysis uses a projection of observed lung cancer deaths before the treatment-associated decline in deaths starting in 2014 (see eFigures 5 and 6 in Supplement 1), this analysis is implicitly conducted in the presence of the impact of tobacco control.
See details in eTable 3 in Supplement 1.
Discussion
In this model-based study using population-level data, interventions discovered through research on cancer prevention and screening (for interception and early detection) were estimated to account for 8 of every 10 deaths averted from breast, cervical, colorectal, lung, and prostate cancer over the past 45 years. Deaths averted from the impact of tobacco control on lung cancer had the most predominant impact. With the exception of breast cancer, these results indicate relatively fewer deaths will be avoided through treatment advances compared with prevention (via smoking cessation) or screening (for interception or early detection). These 5 cancer sites represent 51% of all patients with cancer, and deaths from these cancers represent 42% of all cancer deaths.8 The models did not quantify emerging interventions with low uptake during the study period, suggesting interventions like human papillomavirus (HPV) vaccines, lung cancer screening, and new therapies could further decrease mortality. Reports from Europe provided evidence from clinical practice that HPV vaccination reduces cervical cancer incidence.9,10,11,12
Limitations
Despite the use of well-established and validated models, several caveats should be considered. First, we did not model several cancers with high mortality rates (eg, liver, pancreatic, and ovarian) because population models for these cancers are less mature and challenging to validate. We did not include rare cancer sites, which, when combined, represent 25% of all cancer-related deaths.13 Our results for the overall population may not be generalizable to groups experiencing cancer disparities.14 We did not consider harms of interventions (eg, false-positive screening) or the available resources/capacity to provide services. Mortality measures fail to consider meaningful outcomes for cancer survivors, such as quality of life. Early diagnosis and prevention may reduce or eliminate treatment, minimize harmful adverse effects of the cancer or treatment, and reduce the financial burden of cancer. Finally, our analysis focused on the burden of cancer in the US, which does not reflect the burden worldwide.
Conclusions
In this model-based study of population-level mortality data, cancer prevention and screening activities were the main contributors to reductions in mortality due to the most common cancers in the US over the past 45 years. Despite progress, efforts to further reduce the US cancer burden will require increased dissemination of effective interventions and development of new technologies and discoveries. Future efforts should continue to invest significantly in prevention and screening strategies as part of a comprehensive plan to accelerate progress and reduce cancer mortality.
eFigure 1. US Cervical Cancer Age-Adjusted Mortality Rates: 1975-2020 (Adjusted to US 2000 Standard Population)
eTable 1. Cumulative Breast Cancer Deaths Averted During the Period 1975 through 2020 for Women Aged 25 and Older in the US
eTable 2. Cumulative Colorectal Cancer Deaths Averted during the Period 1975 through 2020 for All Individuals in the US
eFigure 2. US Prostate Cancer Age-Adjusted Mortality Rates and Projections with and without Screening or Changes in Care
eTable 3. Cumulative Prostate Cancer Deaths Averted during the Period 1990 through 2020 for Men Aged 50-84 in the US
eFigure 3. US Age-Specific Smoking Prevalence by Birth Cohort under the Actual Tobacco Control Scenario
eFigure 4. US Age-Specific Smoking Prevalence by Birth Cohort under the No Tobacco Control Scenario
eFigure 5. Total Number of Lung Cancer Deaths Averted from 2014 to 2020 in Men, United States
eFigure 6. Total Number of Lung Cancer Deaths Averted from 2014 to 2020 in Women, United States
eTable 4. Summary of Cumulative Cancer Deaths Averted and Percentage of Deaths Averted from Prevention and/or Screening and Treatment Advances for Five Cancer Types Compared with Counterfactuals of No Interventions Showing Both Primary Outcomes (in the Presence of Treatment Advances) and Secondary Outcomes (in the Absence of Treatment Advances)
eTable 5. Summary of Percentage of Cancer Deaths Averted From All Cancer Deaths in the Absence of Prevention and/or Screening and Treatment Advances for Five Cancer Types
Data Sharing Statement
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Associated Data
This section collects any data citations, data availability statements, or supplementary materials included in this article.
Supplementary Materials
eFigure 1. US Cervical Cancer Age-Adjusted Mortality Rates: 1975-2020 (Adjusted to US 2000 Standard Population)
eTable 1. Cumulative Breast Cancer Deaths Averted During the Period 1975 through 2020 for Women Aged 25 and Older in the US
eTable 2. Cumulative Colorectal Cancer Deaths Averted during the Period 1975 through 2020 for All Individuals in the US
eFigure 2. US Prostate Cancer Age-Adjusted Mortality Rates and Projections with and without Screening or Changes in Care
eTable 3. Cumulative Prostate Cancer Deaths Averted during the Period 1990 through 2020 for Men Aged 50-84 in the US
eFigure 3. US Age-Specific Smoking Prevalence by Birth Cohort under the Actual Tobacco Control Scenario
eFigure 4. US Age-Specific Smoking Prevalence by Birth Cohort under the No Tobacco Control Scenario
eFigure 5. Total Number of Lung Cancer Deaths Averted from 2014 to 2020 in Men, United States
eFigure 6. Total Number of Lung Cancer Deaths Averted from 2014 to 2020 in Women, United States
eTable 4. Summary of Cumulative Cancer Deaths Averted and Percentage of Deaths Averted from Prevention and/or Screening and Treatment Advances for Five Cancer Types Compared with Counterfactuals of No Interventions Showing Both Primary Outcomes (in the Presence of Treatment Advances) and Secondary Outcomes (in the Absence of Treatment Advances)
eTable 5. Summary of Percentage of Cancer Deaths Averted From All Cancer Deaths in the Absence of Prevention and/or Screening and Treatment Advances for Five Cancer Types
Data Sharing Statement
