Samples from patients with AML show high concordance in detection of mutations by NGS at local institutions vs central laboratories

Next-generation sequencing (NGS) to identify pathogenic mutations is an integral part of acute myeloid leukemia (AML) therapeutic decision-making. The concordance in identifying pathogenic mutations among different NGS platforms at different diagnostic laboratories has been studied in solid tumors but not in myeloid malignancies to date. To determine this interlaboratory concordance, we collected a total of 194 AML bone marrow or peripheral blood samples from newly diagnosed patients with AML enrolled in the Beat AML Master Trial (BAMT) at 2 academic institutions. We analyzed the diagnostic samples from patients with AML for the detection of pathogenic myeloid mutations in 8 genes (DNMT3A, FLT3, IDH1, IDH2, NPM1, TET2, TP53, and WT1) locally using the Hematologic Neoplasm Mutation Panel (50-gene myeloid indication filter) (site 1) or the GeneTrails Comprehensive Heme Panel (site 2) at the 2 institutions and compared them with the central results from the diagnostic laboratory for the BAMT, Foundation Medicine, Inc. The overall percent agreement was over 95% each in all 8 genes, with almost perfect agreement (κ > 0.906) in all but WT1, which had substantial agreement (κ = 0.848) when controlling for site. The minimal discrepancies were due to reporting variants of unknown significance (VUS) for the WT1 and TP53 genes. These results indicate that the various NGS methods used to analyze samples from patients with AML enrolled in the BAMT show high concordance, a reassuring finding given the wide use of NGS for therapeutic decision-making in AML.

Comparing Dementia Classification by Self-Report and Administrative Records in the National Core Indicators-Aging and Disability Survey: A Predictive Modeling Approach

Policymakers are interested in the long-term services and supports (LTSS) needs of people living with dementia. The National Core Indicators-Aging and Disability (NCI-AD) survey is conducted to evaluate LTSS care needs. However, dementia reporting in NCI-AD varies across states, and is either obtained from state administrative records or self-reported during the survey. We explored the implications of identifying dementia from administrative records versus self-report. We analyzed 24,569 NCI-AD respondents age 65+, of which 22.4% had dementia. To assess dementia accuracy by data source, we fit separate logistic regression models using the administrative and self-reported subsamples. We applied model coefficients to the population whose dementia status came from the opposite source. Using the administrative model to predict self-reported dementia resulted in higher sensitivity than using the self-report model to predict administrative dementia (43.8% vs. 37.9%). The self-report model's diminished sensitivity suggests administrative records may capture cases of dementia missed by self-report.

ACTUAL AND DESIRED SERVICE USE OF COMMUNITY-DWELLING CONSUMERS OF HOME- AND COMMUNITY-BASED SERVICES

Federal and state long-term care policies are focused on helping people age in their community rather than in nursing homes or other institutional settings. Through home- and community-based (HCBS) waiver programs, states have the flexibility to target specific populations, providing supportive services meant to promote residence in the community. Although consumer needs and goals are a key component of HCBS delivery and effectiveness, little is known about how actual service use differs from the services individuals desire to meet their needs. Using the National Core Indicators-Aging and Disability (NCI-AD™) survey responses from 2018-2019 (N=14,202), an effort by state agencies to measure and track performance outcomes using standardized measures, we examined differences in actual versus desired use of HCBS among people living in the community. Services were categorized as delivered in home-based setting, day services, transportation, support/modification services, health and therapeutic services, and respite. Among NCI-AD respondents in the community (n=9,860), 11% used one service area, 49% used two service areas, and 36% used three or more service areas. The most common service area was home-based services (57%). About a third of community-dwelling respondents desired at least one additional service area. Factors significantly associated with wanting more services included being in combined Medicaid-Medicare, managed LTSS, a woman, an adult aged >65, living alone, and having a physical disability. While the majority of community-dwelling HCBS recipients do not list unmet service needs, there is heterogeneity by program category and other key demographic and social characteristics.

INFORMATION SHARING TO SUPPORT CARE TRANSITIONS FOR PATIENTS WITH COMPLEX MENTAL AND BEHAVIORAL HEALTH NEEDS

Information sharing practices between hospitals and skilled nursing facilities (SNFs) are insufficient to effectively support patient handoffs. Information needs are even greater for SNFs that admit patients with complex behavioral needs. It is unclear whether these needs have prompted hospital investment in enhanced information sharing with these SNFs, and what strategies these facilities are using to meet informational needs. We use data from a 2019 nationally representative SNF survey (N=265, response rate 53%) designed to gather information on information sharing practices with hospital partners. 122 SNFs (57% of respondents) report accepting at least two of the following complex conditions: serious mental illness, substance use disorder, or medication assisted treatment. Using logistic regression models that adjust for facility ownership and rurality, SNFs that accept complex patients are significantly more likely to receive information on behavioral, mental, and functional status compared to facilities who accept none or only one type of complex patient (odds ratio=2.42; p=0.023). Unadjusted models indicate that facilities that accept complex patients lag in IT-facilitated access to hospital information, and report more difficulty securing timely access to information. The significance of these findings do not persist after adjustment, suggesting structural differences in the types of SNFs that hospitals are partnering with to improve information sharing. We conclude that while SNFs that accept complex patients are mostly keeping pace or even doing slightly better in terms of access to hospital information that supports transitional care, further investment is needed to improve hospital information sharing behaviors.

SERIOUS MENTAL ILLNESS IN MINNESOTA NURSING HOMES: THE ROLE OF RESIDENT AND FACILITY CHARACTERISTICS

Multiple studies have shown an increasing prevalence of adults with serious mental illness (SMI) in nursing homes. As adults with SMI age, the reality of care needs that span physical, medical, and psychosocial services necessitates further consideration of the role of comprehensive, ancillary mental health services in nursing homes (NH). Yet, little work examines characteristics of those with SMI, their care needs & the role of facility structural factors. Using the 2011-2017 Minimum Dataset (MDS) assessment data for Minnesota, we examined resident-level demographic characteristics of NH residents with and without SMI, and facility-level characteristics including quality of life (QoL), quality of care (QoC), and state recertification survey scores. We defined SMI as a diagnosis of bipolar disorder, schizophrenia or schizoaffective disorder, or psychotic conditions other than schizophrenia present on the reference assessment. Individuals admitted with SMI were younger, had better physical health, were more likely to be racial/ethnic minorities, and more likely to be admitted to a facility with a higher proportion of racial/ethnic minority residents. SMI-only admissions were concentrated in larger, for-profit facilities with a high-reliance on Medicaid. Lastly, SMI-only admissions were more likely to occur in facilities with lower QoL, QoC, and inspection scores. There is a growing need for behavioral health services in NHs, yet access to services is inadequate and lacks equity based on geography, race/ethnicity and other system-level disparities.

CHARACTERISTICS OF HOSPITALS AND PROVIDER MARKETS ASSOCIATED WITH INCREASES IN HOME HEALTH CARE USE

Many older adults require post-acute care from a nursing home or home health agency following hospitalization. Recent trends show providers are increasingly relying on home health agencies rather than institutionalized settings, with home health volume surpassing skilled nursing facility (SNF) volume since 2017. Using MedPAR patient encounter data from 2016–2019 and provider data from CMS, we analyze changes in the profile of patients receiving home health over time, showing that individuals discharged to home health are increasing in complexity based on hospital length of stay, comorbidities, and use of critical care services. Mixed effects models additionally suggest that grouping patients at the hospital and market level helps to account for unexplained variation in whether a patient is likely to receive home health versus SNF services. Examining the characteristics of hospitals and provider markets with increasing rates of home health referrals over time, we found that hospitals with increasing rates of discharge to home health were more likely to be for-profit facilities in urban areas with higher operating margins. However, this increase was not consistently tied to a corresponding decrease in rates of discharge to SNF, suggesting that hospitals are experiencing a combination of both patient-shifting across post-acute settings as well as an overall increase in baseline complexity of hospitalized patients over this time period. These results have implications for understanding the how policies currently being considered to improve value in the post-acute sector filter through heterogeneous market structures and complex organizational environments to impact patient care decisions.

QUALITY METRICS IN ALFS: FRAMEWORK, MEASURES, AND IMPLEMENTATION

Concerns have surfaced regarding the quality of assisted living (AL) with calls for quality metrics reporting as essential for consumer choice and organizational accountability. This study presents a framework for quality metrics in ALs using a) results from literature review and environmental scan of existing domains and indicators used to assess quality in AL and 2) a survey of results from MN stakeholders (n=822) on their priorities regarding these quality measures. Our findings showed that consumer-reported measures (resident quality of life and family satisfaction) were rated as top priority, followed by staff-based measures (e.g., job satisfaction, turnover). Other domains included residents’ safety, resident health outcomes, care services and integration, and the environment of the ALs. These results have implications for states looking to develop and implement quality measures in ALs, especially in the context of rising AL resident acuity and the continued trend away from institutional models of long-term care.

ASSESSING DEMENTIA CLASSIFICATION IN THE NATIONAL CORE INDICATORS AGING AND DISABILITY SURVEY

Improving the quality of long-term care services for older adults is a national priority. The National Core Indicators Aging and Disability (NCI-AD) collects data from multiple states to evaluate long-term care recipients’ service satisfaction and needs. Many analysts are interested in exploring the service environments of people living with dementia. However, dementia measurement and reporting varies in NCI-AD between states. Dementia status may be obtained from administrative records or self-reported during the survey. We explored the measurement of dementia in NCI-AD and the implications of relying on administrative or self-reported dementia status. We analyzed NCI-AD data from 2015-2018 representing 24,569 respondents age 65+, of which 5,502 (22.4%) were identified as having dementia. 42.9% of respondents had dementia status determined administratively and 57.1% had it determined during the survey. To assess dementia accuracy by data source, we fit separate LASSO models for both the administrative and survey subpopulations predicting dementia status using demographic and functional predictors. We then used each model to predict dementia status in the subpopulation with discordant dementia data source. Using the administrative model to predict survey reported status resulted in a higher sensitivity than using the survey model to predict administrative status (44.6% vs 32.2%). The diminished predictive accuracy of the survey model suggests administrative records may capture cases of dementia diagnosis that would be missed by self-report. These findings highlight analytical caveats for researchers interested study long-term care quality for people with dementia using NCI-AD, and emphasize the importance of moving towards more standardized dementia reporting.

THE LOOMING POST-ACUTE REORGANIZATION: IMPLICATIONS FOR OLDER ADULTS TRANSITIONING FROM THE HOSPITAL

Post-acute volume plays an important role in the care of millions of older adults transitioning from a hospital stay. To help reduce the total cost of care, many hospitals have been shifting more volume from institutional skilled nursing care to less expensive home health care. In fact, in 2017, home health volume eclipsed skilled nursing facility volume as the preferred post-acute destination for the first time. The COVID-19 pandemic further exacerbated this trend with many older adults preferring to avoid institutional care. Using 2016-2019 MedPAR data, we explored changes over time in hospital discharges to skilled nursing facilities versus to home health. We regress the ratio of home health to skilled nursing facility volume on a month-year variable. We find that the ratio of discharges to home health versus to skilled nursing facility increases by .07 percentage points per month (coefficient = .00073, 95% CI [.00063 to .00084]). This translates to a nearly one percentage point change in the ratio of home health to skilled nursing volume per year. These trends vary by patient characteristics (e.g. hospital diagnosis), organizational characteristics (e.g. hospital market relationships), and indicators of market capacity of post-acute services. This growing trend has implications on vulnerable older adults; health system leaders need policy guidance and incentives to invest in value-oriented care practices across this changing post-acute landscape.

NOWHERE ELSE TO GO: EFFECTIVENESS OF THE PASRR PROGRAM TO MEET THE NEEDS OF RESIDENTS WITH SMI ADMITTED TO NURSING HOMES

The number of adults with serious mental illness (SMI) who receive care in nursing homes (NHs) continues to rise. The Preadmission Screening and Resident Review (PASRR) program requires screening for SMI prior to NH placement, in order to avoid inappropriate admission and unnecessary institutional care. We interviewed staff responsible for the processing of PASRR documentation at four NHs in Minnesota (n=15), and obtained and analyzed all completed PASRR-II assessments in Minnesota from 2019 (N=532). PASRR assessments overwhelmingly recommended 24-hour NH care (94.7%) with 94% of assessments indicating a need for mental health services while at the NH. Most NH staff interviewed noted that PASRR is not used in the care planning process and described PASRR as a regulatory hoop. Staff shared that PASRR assessments could provide insight into an individual’s mental health history, current and future needs, and can be helpful in assessing NH capacity to provide such services. Although mental health services provided while at the NH are supposed to be facilitated in partnership with the county, there is a lack of follow-up and NH staff are largely left to deal with SMI in isolation. PASRR assessments are supposed to be a tool for care coordination, but leave the NH as the sole responsible point of contact for residents with SMI. A more integrated PASRR program that better focuses on incorporating PASRR into care planning and mental health service delivery in NHs and the broader community is necessary to improve the lives of individuals with SMI.

Serious Mental Illness in Nursing Homes: Stakeholder Perspectives on the Federal Preadmission Screening Program

The federal Preadmission Screening and Resident Review (PASRR) program was enacted in the 1980s amid concerns surrounding the quality of nursing home (NH) care. This program is meant to serve as a tool to assist with level of care determinations for NH applicants with serious mental illness (SMI) and was intended to limit the growth in the number of NH residents with SMI. Despite this policy effort, the prevalence of SMI in NHs has continued to increase, and little is known about the mechanisms driving the heterogeneous and suboptimal administration of the PASRR program, absent routine evaluative efforts. We conducted 20 semi-structured interviews with state and national stakeholders to identify factors affecting PASRR program administration and NH care for residents with SMI. Stakeholders expressed concern regarding fragmentation, specifically lack of clarity in the value of assessments beyond a regulatory requirement. Additionally, they cited variable program administration as contributing to fragmented communication patterns and inconsistent training across jurisdictions. Given the number of people with SMI currently residing in NHs, policy and practice should take a person-centered approach to assess how PASRR can be better used to support resident needs.

Serious Mental Illness in the Nursing Home Literature: A Scoping Review

Nursing homes (NH) and other institutional-based long-term care settings are not considered an appropriate place for the care of those with serious mental illness, absent other medical conditions or functional impairment that warrants skilled care. Despite policy and regulatory efforts intended to curb the unnecessary placement of people with serious mental illness (SMI) in these settings, the number of adults with SMI who receive care in NHs has continued to rise. Through a scoping review, we sought to summarize the available literature describing NH care for adults with SMI from 2000 to 2020. We found that SMI was operationalized and measured using a variety of methods and diagnoses. Most articles focused on a national sample, with the main unit of analysis being at the NH resident-level and based on analysis of secondary data sets. Understanding current evidence about the use of NHs by older adults with SMI is important to policy and practice, especially as we continue to grapple as a nation with how to provide quality care for older adults with SMI.

Meaningful Assessment or Minimum Compliance: PASRR for Nursing Home Residents with Mental Illness

The Omnibus Budget Reconciliation Act (OBRA) of 1987 included provisions for the Preadmission Screening and Resident Review (PASRR) program, which requires states to create and maintain systems to assess persons with serious mental illness (SMI) seeking NH care. The prevalence of SMI in NHs is increasing, and little is known about the effectiveness of the PASRR program intervention. We conducted 20 interviews with state and national PASRR stakeholders, including assessors, hospital discharge planners, mental health advocates, geriatricians and geriatric psychiatrists. Interview data were triangulated with state provided materials on PASRR collection and implementation. Based on these interviews, we identified four themes: 1) variation in the implementation of federal PASRR legislation across states and jurisdictions, 2) the need for investment in professional development and workforce capacity, 3) lack of usefulness of PASRR in ongoing care planning, and 4) the need to consider the role of age, race/ethnicity, and stigma on quality of care for NH residents with SMI. Stakeholders agree that PASRR legislation was well intentioned, but also expressed concern regarding the completion of PASRR as an issue of compliance versus meaningful assessment. More work is needed to determine how best to develop and support the care needs of people with SMI, while being mindful of the original goals of deinstitutionalization that prompted OBRA passage. In order to assess the impact of the PASRR program on quality of care and mental health outcomes, further research should take an evaluative approach through meaningful use of PASRR data.

Scoping Review: Home and Community-Based Service Waiver Programs and Person-Reported Outcomes

State Medicaid programs are rebalancing their long-term care spending from nursing home to home and community-based services (HCBS). Emphasis on person-centered and person-directed care warrants investigation into models of HCBS delivery that promote quality of life. We performed a scoping review of the literature to catalogue the breadth of the studies describing HCBS waiver programs targeting adults (18+). We identified 757 articles, and after duplicate removal and reconciliation, we excluded articles on children or adolescents, non-peer reviewed reports, international studies, and articles that did not describe HCBS waiver programs. After abstract and title review, 292 articles met our inclusion criteria. Most included articles (22.3%) were single state descriptive evaluations or evaluations of service use patterns among participants. 17.8% of included articles examined multi-state or national variation in program trends, while 17.1% made national program conclusions without a major focus on interstate comparison. Less common were studies examining integrated care or dual-eligibles (7.5%), PACE (3.4%), medication management (3.1%), quality and satisfaction of both consumer and caretaker perspectives (3.8%) and consumer-only perspectives (5.1%). The remaining articles focused on HIV (4.1%), TBI (1.4%) or ID/DD (14.4%) waiver programs. The 8.9% of articles addressing quality and satisfaction consisted mostly of interviews, either with state Medicaid administrators or with care recipients and/or caregivers. Consumer reported satisfaction and unmet care needs were the primary outcomes examined. Given the heightened focus on long-term care as a result of the ongoing coronavirus pandemic, this review justifies further exploration into the delivery and outcomes of state-directed HCBS waiver programs.

Connecting policy to licensed assisted living communities, introducing health services regulatory analysis

OBJECTIVE

To document dementia-relevant state assisted living regulations and their changes over time as they pertain to licensed care settings.

DATA SOURCES

For all states, current directories of licensed assisted living communities and state regulations for each year, 2007-2018, were obtained from state agency websites and Nexis Uni, respectively.

STUDY DESIGN

We identified multiple types of regulatory classifications for each state and documented the presence or absence of specific dementia care provisions in the regulations for each type by study year. Maps and summary statistics were used to compare results to previous research and document change longitudinally.

DATA COLLECTION/EXTRACTION METHODS

We used a policy analysis approach to connect communities listed in directories to applicable regulatory text. Then, we employed policy surveillance and question-based coding to record the presence or absence of specific policies for each classification and study year.

PRINCIPAL FINDINGS

Our team empirically documented provisions requiring dementia-specific training for administrators and direct care staff, and cognitive impairment screening for each study year. We found that 23 states added one or more of these requirements for one or more license types, but the states that had these provisions for all types of licensed assisted living declined from four to two.

CONCLUSIONS

We identified significant, previously undocumented, within-state policy variation for assisted living licensed settings between 2007 and 2018. Using the regulatory classification instead of the state as the unit of analysis revealed that many policy adoptions were limited to dementia-designated settings. This suggests that people living with dementia in general assisted living are not afforded the same protections. We call our approach health services regulatory analysis and argue that it has the potential to identify gaps in existing policies, an important endeavor for health services research in assisted living and other care settings.

Variation in Assisted Living Regulations Within and Across States

Assisted living (AL) regulations have been long recognized as being highly variable across states. A new approach developed by our team, Health Services Regulatory Analysis, allows for a more granular identification of within-state variation in AL regulation. We identified 172 licensing classifications from the 50 states and DC representing 58 primary license types, 48 sub-types, and 66 designations that can modify a primary or sub-license. Over two-thirds (72%) of dementia-specific classifications require that all staff receive initial dementia training, compared to only one-third (33%) of general AL classifications. This trend is similarly reflected in cognitive-screening requirements, present in 67% of dementia-specific classifications and 42% of general AL classifications. Regulatory theory describes how licensing agencies respond to various forces and values. Within-state AL regulatory variation reflects a combination of oversight mandates, population-specific needs (e.g., people with dementia), historic policies, and provider influence, with implications for consumers, policy-makers and researchers. Part of a symposium sponsored by Assisted Living Interest Group.

Patients with FLT3-mutant AML needed to enroll on FLT3-targeted therapeutic clinical trials

We sought to identify the total number of therapeutic trials targeting FLT3-mutant acute myeloid leukemia (AML) to estimate the number of patients needed to satisfy recruitment when compared with the incidence of this mutation in the US AML population. A systematic review of all therapeutic clinical trials focusing on adult FLT3-mutated AML was conducted from 2000 to 2017. An updated search was performed using ClinicalTrials.gov for trials added between October 2017 and December 2018. Analysis was performed for ClinicalTrials.gov search results from 2000 to 2017 to provide descriptive estimates of discrepancies between anticipated clinical trial enrollment using consistently cited rates of adult participation of 1%, 3%, and 5%, as well as 10% participation identified by the American Society of Clinical Oncology in 2008. Twenty-five pharmaceutical or biological agents aimed at treating FLT3-mutant AML were identified. Pharmaceutical vs cooperative group/nonprofit support was 2.3:1, with 30 different pharmaceutical collaborators and 13 cooperative group/nonprofit collaborators. The number of patients needed to satisfy study enrollment begins to surpass the upper bound of estimated participation in 2010, noticeably surpassing projected participation rates between 2015 and 2016. The number of patients needed to satisfy study enrollment surpasses 3% and 5% rates of historical participation for US-only trials in 2017. We estimate that 15% of all US patients with FLT3-mutant AML would have to enroll in US and internationally accruing trials to satisfy requirements in 2017, or approximately 3 times the upper level of historical participation rates in the United States. The current clinical trial agenda in this space requires high percentage enrollment for sustainability.

Trends in Medical Aid in Dying in Oregon and Washington

IMPORTANCE

The combined 28 years of data of medical aid in dying (MAID) between Oregon (OR) and Washington (WA) are the most comprehensive in North America. No reports to date have compared MAID use in different US states.

OBJECTIVE

To evaluate and compare patterns of MAID use between the states with the longest-running US death with dignity programs.

DESIGN, SETTING, AND PARTICIPANTS

A retrospective observational cohort study of OR and WA patients with terminal illness who received prescriptions as part of their states' legislation allowing MAID. All published annual reports, from 1998 to 2017 in OR and from 2009 to 2017 in WA, were reviewed. A total of 3368 prescriptions were included.

MAIN OUTCOMES AND MEASURES

Number of deaths from self-administration of lethal medication vs number of prescriptions written.

RESULTS

A combined 3368 prescriptions were written in OR and WA, with 2558 patient deaths from lethal ingestion (76.0%). Of the 2558 patients, most were male (1311 [51.3%]), older than 65 years (1851 [72.4%]), and non-Hispanic white (2426 [94.8%]). The most common underlying illnesses were cancer (1955 [76.4%]), neurologic illness (261 [10.2%]), lung disease (144 [5.6%]), and heart disease (117 [4.6%]). Loss of autonomy (2235 [87.4%]), impaired quality of life (2203 [86.1%]), and loss of dignity (1755 [68.6%]) were the most common reasons for pursuing MAID. Time between drug intake to coma ranged from 1 to 660 minutes and time from drug intake to death ranged from 1 to 6240 minutes. In the 1557 patients for whom rates of complications were reported, 1494 (96.0%) did not experience a complication (592 of 626 [94.6%] in OR and 902 of 931 [96.8%] in WA). Eight patients (<0.5%) regained consciousness after drug ingestion in OR. Annual rates per year for percentage of patients who received a prescription ingesting the prescribed medication ranged from 48% to 87%, with no significant time trend in OR (adjusted odds ratio per year, 1.01; 95% CI, 0.99-1.02; P = .59) but with an increase over time in WA (adjusted odds ratio per year, 1.13; 95% CI, 1.08-1.19; P < .001). In both OR and WA there were increases in the number of patient deaths due to MAID per 1000 deaths over time.

CONCLUSIONS AND RELEVANCE

In this study, MAID results in Oregon and Washington were similar, although MAID use measured as a percentage of patients prescribed lethal medications and then self-administering them increased only in WA. Most patients who acquired lethal prescriptions had cancer or terminal illnesses that are difficult to palliate and lead to loss of autonomy, dignity, and quality of life.

Peptides from conserved regions of paramyxovirus fusion (F) proteins are potent inhibitors of viral fusion

The synthetic peptides DP-107 and DP-178 (T-20), derived from separate domains within the human immunodeficiency virus type 1 (HIV-1) transmembrane (TM) protein, gp4l, are stable and potent inhibitors of HIV-1 infection and fusion. Using a computer searching strategy (computerized antiviral searching technology, C.A.S.T.) based on the predicted secondary structure of DP-107 and DP-178 (T-20), we have identified conserved heptad repeat domains analogous to the DP-107 and DP-178 regions of HIV-1 gp41 within the glycoproteins of other fusogenic viruses. Here we report on antiviral peptides derived from three representative paramyxoviruses, respiratory syncytial virus (RSV), human parainfluenza virus type 3 (HPIV-3), and measles virus (MV). We screened crude preparations of synthetic 35-residue peptides, scanning the DP-178-like domains, in antiviral assays. Peptide preparations demonstrating antiviral activity were purified and tested for their ability to block syncytium formation. Representative DP-178-like peptides from each paramyxovirus blocked homologous virus-mediated syncytium formation and exhibited EC50 values in the range 0.015-0.250 microM. Moreover, these peptides were highly selective for the virus of origin. Identification of biologically active peptides derived from domains within paramyxovirus F1 proteins analogous to the DP-178 domain of HIV-1 gp4l is compelling evidence for equivalent structural and functional features between retroviral and paramyxoviral fusion proteins. These antiviral peptides provide a novel approach to the development of targeted therapies for paramyxovirus infections.