- Research article
- Open Access
- Open Peer Review
A grey literature review of special events for promoting cancer screenings
© Escoffery et al.; licensee BioMed Central Ltd. 2014
- Received: 10 January 2014
- Accepted: 10 June 2014
- Published: 19 June 2014
Cancer remains the second leading cause of mortality in the United States. Special events such as health fairs, screening days or cultural festivals are employed often for community education about cancer screening. A previous systematic review of the published literature was conducted in 2012-2013. The purpose of this study was to conduct a grey literature component of special events that promote breast, cervical and colorectal cancer screening in the U.S.
We conducted a grey literature search of dissertations/theses and conference abstracts. The theses/dissertations were restricted to those: 1) written in English, 2) published from January 1990 to December 2011, 3) examined at least one of the predefined categories of special events, 4) involved cancer screening for breast, cervical, and/or colorectal cancer, 5) included outcome data, and 6) conducted in the United States. A review of U.S. public health and cancer conference abstracts, that were readily available and had focused on at least of 3 cancer types and included outcome data, was conducted. Data were abstracted on the purpose, location, primary audience(s), activities conducted, screening provided onsite or referrals, and evaluation results.
The grey literature review found 6 special events. The types of events found added to the numbers found in the systematic review, especially receptions or parties and cultural festivals/events. All focused on increasing breast and cervical cancer screening except one that focused on breast cancer only. The reach of these events was targeted at mostly minorities or underserved communities. Common evidence-based strategies were group education, small media, and reducing structural barriers. Group education involved presentations from physicians, lay-health advisors, or cancer survivors, while reducing structural barriers included activities such as providing screening appointment sign-ups at the event or providing transportation for event participants. Mammogram screening rates ranged from 6.8% to 60% and Pap tests from 52% to 70%.
Further evaluation of special events to promote cancer screening will prove their effectiveness. A grey literature review can augment a systematic review of published literature. Additional data about these events through the grey literature offered additional insights into the goals, intervention components and outcomes of interventions.
- Cancer screening
- Community awareness
- Cancer education
- Breast cancer
- Colorectal cancer
- Cervical cancer
Cancer remains the second leading cause of mortality in the United States. The estimated lifetime risk of developing cancer is 45% among men and 38% among women . Breast cancer accounts for nearly 30% of all new cancers diagnosed in females with 234,850 new cases expected in 2013. Colorectal cancer is the third most common cancer in both females and males and 142,820 new cases are expected to be diagnosed in 2013 . Although cervical cancer leads to far fewer deaths, 12,340 women are expected to be diagnosed with it in 2013. Combined, these cancers are expected to result in 94,890 deaths, the majority of which can be prevented through regular screening tests that allow for the detection and removal of precancerous growths . Cancer screening is essential to finding cancer before symptoms appear and helps with treatment or curing it when found early. According to the 2010 NHIS, 72.4% of women have been screened for breast cancer and 83.0% for cervical cancer . For colorectal cancer, only 58.6% of adults ages 50 to 75 are up to date with screening . These rates are below the Health People 2020 targets for screening.
The practice of cancer screening has increased due to the accessibility and affordability of the screenings [1–4]. However, there is still a disproportionate number of uninsured or underinsured individuals that do not have access to regular cancer screenings and suffer higher rates of mortality as a result . Additional barriers to cancer screening include lack of knowledge, lack of a doctor’s visit in the past year or regular provider, lack of physician recommendation, no family history, or having no symptoms [5–7].
Intervention strategies such as educational workshops, mass marketing, small media, and more recently social media can increase the number of people who regularly receive cancer screenings . The U.S. Preventive Task Force’s Community Guide for Preventive Services recommends intervention strategies to increase screening for breast, cervical and colorectal cancer. The Community Guide recommends provider assessment and feedback; provider and client reminders; small media (print materials) and one-on-one education to increase the uptake of breast, cervical, and colorectal cancer (FOBT) screening [8, 9]. Sufficient evidence suggests that the uptake of screening for colorectal (FOBT) and breast cancer is also increased by reducing structural barriers to screening; however, these interventions need to be further examined for cervical cancer screening.
Special events such as cultural events, charity walks/runs, receptions/parties, and health fairs are routinely conducted by state health departments and community-based organizations to disseminate health promotion activities directly to the community. In a recent systematic review, ten studies that evaluated special events aimed to increase breast, cervical, and colorectal cancer screenings were described . The review of 10 published events found five common types of special events: health fairs, parties, cultural events, special days, and plays. The most frequent activities mapped onto Community Guide strategies were reducing structural barriers to screening, one-on-one or group education, and provision of cancer educational materials. Screening rates as a result of the special events varied by type of screening: 1.7% to 88% of participants for mammograms, 3.9% to 10.6% for pap testing, 29.4% to 76% for FOBT and 1% to 100% for sigmoidoscopy. The special events that offered onsite screenings reported higher screening outcomes .
Due to the limited peer-reviewed literature on special events that aim to increase cancer screenings, a review of the grey literature was conducted. Grey literature is defined as a range of published and unpublished materials, which are not normally identifiable through conventional methods of bibliographic control . It can include book chapters, books, conference abstracts, reports, unpublished data, dissertations, policy documents and personal correspondence . A comprehensive review of both the peer-reviewed and non-peer-reviewed published and unpublished knowledge-base is essential in making decisions about intervention practice and effectiveness . The Cochrane Handbook for Systematic Reviews suggests that 30% of the evidence-base is derived from unpublished or non-peer reviewed literature . Fewer than half of trials presented at conferences continue to full publication and there are systematic differences between the trials that are published and those that are not [14–16].
Due to the labor-intensive process of searching grey literature, it is often not performed. In many cases, results found in the grey literature are not followed by a formal publication and are not disseminated at all to the public health audience . In addition, grey literature has not gone through the level of rigor that peer-reviewed, published materials have; therefore, debate does exist on how much value this evidence adds to the field . However, it can identify emerging evidence before a formal publication is produced and can provide fuller range of outcomes given that null results are less likely to appear in the peer-review literature.
The purpose of this research was to conduct a review of grey literature in order to identify special events for increasing breast, cervical, and colorectal cancer screening among conference proceedings and dissertations/theses. These findings will augment a systematic review of similar special events found in the published literature by examining special event interventions that were performed but have not yet been published in the peer-reviewed literature.
General framework for the grey literature review
The grey literature search focused on two main areas: dissertations/theses and scientific conferences. It was guided by our earlier developed conceptual model that hypothesizes relationships between special events, determinants of cancer screening behavior, and actual screening behavior . Hence, the search aimed to identify literature that addressed at least one of two primary outcomes of special events including: screening determinants (e.g., increased awareness, knowledge, intentions to get screened, and referrals for screening) and completed cancer screenings.
An advisory committee that consisted of cancer researchers, funders, and practitioners from the Centers for Disease Control and Prevention (CDC), Comprehensive Cancer, Colorectal Cancer Control Program and Division of Cancer Prevention and Control, and the Cancer Prevention and Control Research Network was formed to guide the review process. The committee provided scientific input and advice on the grey literature review methods, the conceptual framework, and the inclusion criteria for non-peer reviewed/unpublished literature. The committee also played an integral role in identifying national, regional, and local cancer prevention conferences and providing conference agendas and materials when needed. The grey literature review was designated as exempt from IRB review from Emory University since it did not involve human subjects.
Dissertation/thesis literature search
Types of dissertation/thesis studies
The dissertations or theses were restricted to those: 1) written in English, 2) published from January 1990 to December 2011, 3) examined at least one of the predefined categories of special events, 4) involved cancer screening for breast, cervical, and/or colorectal cancer, 5) included outcome data, and 6) conducted in the United States. Theses or dissertations were excluded if they did not report on screening determinants (e.g., intentions to get screened, appointments) or health outcomes; if the type of cancer or outcomes were not related to breast, cervical or colorectal cancer screening or if this was not apparent through reviewing the full thesis or dissertation; or if the dissertation was unable to be located through ProQuest.
Search methods for dissertation/thesis studies
In August 2011, the study team searched the ProQuest Database. ProQuest is the online database that houses searchable bodies of work that have been submitted by masters and doctoral students for fulfillment of a terminal degree. Keywords for the search included: health fair, cultural event/festival, charity walk/run/walkathon, reception/dinner/gala, play, contest, and art/photo exhibit. These terms were combined with cancer prevention and control; breast, cervical, and colorectal cancer screening; evaluation; and cancer screening. The search terms were developed based on PubMed MeSH headings and through consultation with a certified health sciences librarian. The resulting composite library was then exported into an Excel file for documentation of the abstract review process.
Identifying dissertation/thesis studies
Dissertations and theses search results
The ProQuest™ dissertations and theses search identified 107 abstracts. Of these, the study team screened 94 abstracts for eligibility since 13 had been removed as duplicates. There were 91 abstracts that did not meet eligibility criteria and were excluded from further review; common reasons were that they did not fit study definitions of special events, did not focus on breast, cervical, or colorectal cancer screening, or they did not evaluate the event. Three abstracts were selected for full-text review, and of those, 1 dissertation met the eligibility criteria outlined for the study.
Dissertations and Theses
Description of dissertation study
Special events grey literature summary table
Presentation title & focus
Special event description
Conferences – Single Component (Special event only)
K. White 
Does conducting routine community health outreach events reach new women? An evaluation of a breast & cervical cancer screening program for Latina immigrants
Pre-event and Post-event
Target audience: Latina immigrants
Event Type: Educational Luncheon
Cancer focus: Breast and Cervical
Sample: N = 932 Latina immigrants; age: 70.7% 18-39, 19.4% 40-49, and 9.9% 50-88; 6.9% Insured
Description: Educational luncheons focused on breast and cervical cancer, were hosted at local churches on Saturday mornings to increase screening among target population.
No data available
APHA Conference, 2010
Post Event Screening:
• Educational presentations from Spanish-speaking physicians and/or breast cancer survivors
Pap Tests: 412 (52%)
• Referrals and ability to schedule pap tests and mammograms
Out of n = 792, women who completed information records
• Magnets were provided with appointment and provider information for the low-cost pap and free mammogram screenings
Mammogram: 141 (60.8%)
Community Guide Strategies: GE, CRR, SM, ROPC, RSB
Out of n = 232, women who completed information records and were over 40 years of age
Other Outcomes: No data available
Cost: No data available
C. Rice 
Implementation of an Evidence-based Cancer Prevention and Control Program through Texas AgriLife Extension: Friend to Friend
Pre-event and Post-event
Target audience: Uninsured and underserved women in rural Texas
Event Type: Health Party
Cancer focus: Breast and Cervical
Sample: N = 1,095 participants; 41% under age 50, 32% 50-64, and 27% 65 and older; 93% white, 7% African American
Description: 45 health parties were planned throughout 40 counties. The parties were designed for adult women to hear a health professional speak and to identify clinics that provide uninsured women screening.
Within last 12 months: 49.4%
• Group educational sessions were provided by health care providers or cancer survivors; followed by small group discussions
Within last 24 months: 10.1%
• Educational materials were provided in English and Spanish
Within the last 3-years: 5.4%
• Incentives were provided
Longer than 3 years: 10.0%
• One party provided mammogram screening on-site
Never had a mammogram: 25.2%
• Providers came to the events to sign participants up for screening referrals and scheduling of appointments
Pap Test Status:
• Community Guide Strategies: GE, SM, RSB, ROPC
Within last 12 months: 54.3%
Within last 24 months: 15.6%
Within last 3 years: 5.1%
Longer than 3-years: 20.9%
Never had a Pap: 4%
Post Event Screening: No data available
Other outcomes: Knowledge
Cost: No data available
D. Dahlke 
Increasing Screening Rates for Latinas Using Health Fiestas and Promotoras
Pre-event and Post-event
Target audience: Underserved Latinas
Event Type: Cultural Event/Health Fiesta
Cancer focus: Breast and Cervical
Sample: N = 8,026 (for the Georgia Events); 86% uninsured
Description: The health fiestas were designed to reduce health disparities within the Latino Community through the events and a patient navigation program which were designed to provide access to early detection and screening opportunities.
In the last 12 months: 4,816 (60%)
• Educational materials were provided in Spanish
Pap Test status:
• Food, music, dancing, and fun activities were provided
Last 12 month: 6,423 (80%)
• Local health care providers offered free or low-cost screenings
Post Event Screening:
• Community Guide Strategies: 1 on 1, GE, SM, RSB, ROPC
Mammogram: 218 (6.8%) of screening eligible
Clinical Breast Exams: 3158 (39.3%)
Other outcomes: Barriers to care
Cost: No data available
Dissertation – Single Component
A. Sun 
Promoting Breast Cancer Screening Among Chinese American Women Through Young Children’s Theatrical Performance, 2009
Pre-event and Post-event
Target audience: Chinese American females, able to read either Chinese or English, 18 or older, and audience members
Event Type: Play
Dissertation Source: Proquest
Cancer focus: Breast
Sample: 173 participants; Average age: 40.1; 100% Asian and female; 85% covered by insurance
Description: a theatrical pre-school performance in educating Chinese American women about breast cancer detection.
Had a mammogram in past year (women > 40 years old):
• Pre-school theatrical performances were used as an screening educational tool
Change in Knowledge Score Pretest to Posttest:
• Foam boards in the play displayed Susan G. Komen guidelines
Community Guide Strategies: SM, GE
41.8% had no change
Post Event Screening:
No data available
Other outcomes: Attentiveness, Acculturation
Cost: No data available
Conferences – Multiple Components (Special event combined with other community events)
L. Vera-Cala 
Effectiveness of Cuidandome (Taking Care of Me)
Pre-event and Post-event
Target audience: Latina-immigrant women in Dane County, WI
Event Type: Health Parties
Cancer focus: Breast and Cervical
Sample: N = 1,381; Spanish speaking women
Description: 167 home health parties led by lay health advisors were performed to increase breast and cervical cancer screening among Latino-immigrant women.
Mammogram (n = 222):
APHA Conference, 2011
• One hour educational session on breast and cervical cancer
Pap Test (n = 222):
• Same language lay health providers used to promote cervical and breast cancer screening
• Provided resources to party participants on how to apply for free or reduced cost screening
Post Event Screening:
Community Guide Strategies: GE, SM, MM, RSB, ROPC
1-month post: 91 (41%)
3-months post: 127 (57%)
15-months post: 118 (53%)
1-month post: 151 (68%)
3-months post: 155 (70%)
15-months post: 140 (63%)
Other outcomes: Intention, Knowledge
Cost: Approximately $130.00 per event
B. Hunt 
Reaching at-Risk Women to Promote Breast Cancer Screening on the Westside of Chicago
Pre-event and Post-event
Target audience: Women over 40, African American and Hispanic, uninsured or under insured women
Event Type: Forums and Health Fairs
Cancer focus: Breast and Cervical
Sample: N = 880; 87% over 40; 58% African American; 36% Mexican or Puerto Rican; 40% no insurance
Description: The forums and health fairs were designed to reduce disparities and improve overall breast health outcomes by educating, engaging, and empowering women to increase routine mammogram utilization and to share their knowledge.
Mammography (women > 40):
APHA Conference, 2011
Within 2 years: 443 (61%)
• Community health workers provided 45-minute educational presentations and helped participants set-up appointments
2 or more years ago: 187 (26%)
• Client reminders are sent to participants when due for their next screening
Never: 95 (13%)
• Gifts, raffles, and specialized cookies were provided as incentives
Post Event Screening:
• Transportation was provided
Mammography: n = 357 (40.1%)
• Women requesting screening appointments are assigned patient navigator.
Cost: $3,000-$4,000 per forum
Community Guide Strategies: GE, CRR, SM, RSB
The twenty minute play used several instructional techniques to educate the audience including the use of the songs, Mommy is the best person in the world and Mommy, Grandma, and Aunties we love you, Please take good care of yourself, which aimed to increase awareness of the women’s role in the family and highlight the innate care giving nature of women in the family which extends to the responsibility of the women to take care of themselves. In addition to the use of song, posters that presented breast cancer screening guidelines and educational messages from the Susan G. Komen Foundation were shared in both Chinese and English.
A baseline survey assessing knowledge of breast cancer screening guidelines, current screening practices, and age was distributed to audience members as they arrived. In the post-test, screening intentions, knowledge about breast screening guidelines and intentions to conduct a self-breast exam (SBE) and schedule an appointment for a clinical breast exam (CBE) and mammogram as recommended by the breast cancer screening guidelines were measured.
Results indicated that there was an increase in knowledge of breast cancer screening guidelines. For this largely Chinese immigrant population, the degree of acculturation and attentiveness to the play was positively associated with an increased knowledge score and the intent to follow the breast cancer screening guidelines. Approximately 46% of the participants reported that they would rather receive health messages incorporated into children’s performances than through conventional channels.
Conference literature search
Types of studies presented at conferences
Eligibility criteria for conference abstracts included that they were in English; examined at least one-type of special event; and focused on breast, cervical or colorectal cancer prevention.
Three-stage search and data gathering methodology for conference grey literature
Stage I: abstract search
From November 2011 to March 2012, the project team conducted a grey literature review of conference abstracts that occurred in the U.S., focused on breast, cervical and colorectal cancer and had screening-related outcomes. The advisory committee and the study team created a list and performed an internet search of national, regional, and local organizations that held conferences covered health promotion on cancer or breast, cervical, or colorectal cancer prevention.
Name of organization
# Abstracts reviewed
# Abstracts chosen for discussion
# Included studies
World Conference on Breast Cancer Foundation
American Public Health Association (APHA)
National Association of County and City Health Officials (NACCHO)
National Institutes of Health (NIH) Colorectal Cancer Screening Conference
Society for Public Health Education (SOPHE)
5/2009, 11/2009 4/2010, 11/2010 5/2011, 10/2011
Society of Behavioral Medicine (SBM)
Cancer Prevention Research Institute of Texas (CPRIT)
2010 & 2011
Conference descriptions were independently reviewed by two study team members to determine if the conferences met study eligibility criteria. For a conference to be eligible, it had to be conducted between 2009 and 2011 in the United States and include topics on breast, cervical, and/or colorectal cancer prevention.
Once a conference was chosen for inclusion, the agendas and presentation and/or poster abstracts were obtained through the website or sponsor. If the website did not provide these materials then a sponsoring organization member, a conference attendee and/or a presenter collaborator was contacted to obtain this information for the review. Organizations for which we were not able to collect abstracts or conference agendas were excluded from the study (n = 3).
Two study team members independently reviewed the presentation and poster abstracts for study eligibility. Abstracts that did not provide enough information to determine eligibility were excluded for further review. This review resulted in 20 abstracts being chosen for group discussion with the principal investigator and project manager. Based on further examination of the cancer and event-type discussed in the abstract, 7 abstracts were excluded because of their alignment with the definition of a special event, the location of the event (excluded for being outside of the U.S.), and their screening focus.
Stage II: solicitation of additional information from presenters
The authors of the 13 included abstracts were contacted via e-mail or phone to request additional materials about the event(s) discussed in their presentation, including presentation slides, posters, printed public reports, or summaries. Only 7 participants responded with presentation and project information after six attempts.
Two trained reviewers abstracted the information that was provided by the presenters through the use of a Data Abstraction Form, a six-part form that included questions concerning the title, researcher(s), methods, results, reported cost of the event(s), resources, and barriers to implementation. After the reviewers completed abstraction of the additional materials, a second project team meeting was held to re-examine the eligibility of the conference presentations based on the additional information provided. Two conference presentations were excluded during this process. This resulted in five conference presentations included in Stage II.
Stage III: interviews with presenters for further information
The presenters, whose presentations were chosen for inclusion, were contacted a second time to set up a time to participate in a telephone interview to provide additional information on their event. A follow-up interview guide was created by the project team to better understand the event and included questions on the event’s type, goals and objectives, implementation steps, screening availability, partners, recruitment, costs, evaluation, follow-up, barriers, and other program components. Data that were already collected from the abstract or the other obtained materials were added to the interview guide prior to the interview to allow for verification or clarification during the interview. The telephone interviews were 30 to 45 minutes long and were recorded with consent from the presenter. One participant completed the interview guide through e-mail. Based on the data from the interview, the abstraction form for each conference presentation was completed.
Data obtained from the three-stage process
Type of conference data by method
Type of conference data
Stage I: abstracts
Stage II: additional materials
Stage III: Interviews
Author, Title, Conference, Date of Conference
Part of Additional Activities (Larger intervention or Research Project)
Goals and Objectives of Event or Research
Type of Event and Cancer
Type of Cancer Screening Services Provided (Exams, Referrals, Patient Navigators)
Community Guide Strategies Used
Other Health Services Provided
Other Health Topics Discussed
Educational Materials (sources, type)
Logistics (Date, Duration, Frequency)
Setting (Place, setting, area)
Who Provided Services
Agencies Involved (Host, Funders, Partners)
Demographics of Participants
Process Outcomes (If it was collected, results)
Screening Outcomes (If it was collected, results)
Follow-up (If it was collected, results)
Other Outcomes (If it was collected, results)
Costs and Resources
Further Cost Information (Break-down of costs, cost analysis, resources)
Description of the events presented at conferences
Our grey literature search of conference presentations resulted in identifying 5 programs that utilized 3 types of special events: 1) health fair , 2) reception/party/special meal [19–21], and 3) cultural event . Details on each presentation’s target audience, implementation techniques, types of data collected, and results are described in Table 1. All of the programs focused on both breast and cervical cancer screening; no qualifying studies focused on colorectal cancer screening. All five of the programs were designed to target minority populations, including Latinas [18, 22], Latina immigrants [19, 21], African Americans [18, 20], and the uninsured/underinsured [18–20].
Three of the programs involved standalone (single-component special event) events [19, 20, 22] while two programs performed events in conjunction with other outreach activities (multi-component) [18, 21]. The other activity components that occurred in conjunction with the special events included canvassing, kiosks, hotlines, and referrals as part of the Helping Her Live Model  and activities such as media promotion for breast and cervical cancer screening, cultural competency training, and an end of year party as part of the Cuidandome intervention . All of the events that reported their frequency occurred multiple times throughout their respective study periods, with a range of 14  to 167  events held during study periods ranging 7 months  to 7 years . The cumulative number of participants at the events ranged widely from 880  to 8,026 .
Activities at the events were categorized according to the Community Guide recommended strategies to increase cancer screening by the study team [8, 9]. Four or more community guide strategies were utilized at all five of the events. The most commonly used strategies included group education, small media, and reducing structural barriers (employed at all 5 events), followed by reducing out-of-pocket costs (employed at 4 events), client reminders and recalls (employed at 2 events), and lastly, the use of mass media and one-on-one education (employed at 1 event). Common types of group education involved presentations from physicians, lay-health advisors, or cancer survivors [18–21]. Reducing out-of-pocket costs was done by providing access or resources for low-cost or free preventive screening services [19–22], while reducing structural barriers involved activities such as providing screening appointment sign-ups at the event [19, 20] or providing transportation for event participants .
Screening data was collected post-event for all of the programs except one . Pre and post-event data was collected at all five of the events. Mammogram screening rates ranged from 6.8% to 60% and Pap test from 52% to 70%. The denominator for screening reflects that number of attendees that the events reported in their event/study methods reported in the abstracts or interview data. Follow-up periods ranged from one-week to 15-months. Additionally, on-site clinical breast exams (CBE) were provided at events as part of one of the programs, which resulted in 3,158 (39%) women receiving a CBE . Additional data that was collected during or after the event included screening determinants such as knowledge and intention to be screened [20, 21] and barriers to care .
Finally, four of the programs provided additional cost information [18, 20–22]. The type of information on program costs provided by participants varied. One event provided the total grant amount, two provided a number with limited description of what it represented, and the forth provided a per event cost break down. Based on the variety in the type of cost information collected, descriptive statistics could not be provided. One event of health parties detailed costs at $130 per event, while another of health forums had costs of $3000-$4,000 per event.
The grey literature review found 6 additional special events to add to our systematic review findings. Through our systemic review, we found five types of special events relevant to cancer screening: health fairs, parties, cultural events, special days, and a play. The types of events found in this grey literature review added to the numbers found in the systematic review, especially for receptions or parties and cultural festivals/events. The events all focused on increasing breast and cervical cancer screening except one that focused on breast cancer only. Similar to the systematic review findings, common evidence-based strategies recommended by the Guide to Community Preventive Services employed by these events were group education, small media and reducing structural barriers . Five out of the six studies reported post event screening data [18, 19, 21, 22]. The reach of these events was targeted to mostly minorities or underserved communities and large in terms of event participants. Many were offered multiple times [19–22]. The events did results in cancer screening; for the 4 events that reported screening, generally rates were higher for cervical cancer than breast cancer. However, there is limited data to support the overall effectiveness because the results found different categories of events, intervention components, and different cancer screenings reported. Special events could be opportunities to increase education and screening particularly if they are more regularly implemented in communities. In addition, they may also reach a segment of the population that may not have easy access to medical centers or health clinics and who attend special events to receive clinical services .
Combining a grey literature review with a systematic literature review did contribute to a greater understanding of special events for promoting cancer screening by enhancing both the breadth of events found and depth of knowledge of these events. Similar to another review of grey literature for medical interventions, we found more special events promoting cancer screening from conference abstracts . Often, practitioners and researchers may share their work at professional meetings but may not publish their results in peer-reviewed journals. A systematic review of 11 studies of 39 meetings found that 31% of submitted abstracts both accepted and rejected to biomedical meetings were eventually published as full articles . Barriers to subsequent publications from conference abstracts exist, including limits of time, a project or study is ongoing, a belief that the responsibility for writing a manuscript belonged to another co-author, funding and lack of participation from co-authors [25–27]. Therefore, similar to this study, the inclusion of grey literature is recommended when the intervention and outcomes are complex and have multiple components and in the situation that the volume of published literature is low .
Recently, CONSORT guidelines have been developed for conference organizers to provide specific instructions about the key elements of a trial that authors should report . Although a common pitfall of conference abstracts is the limited amount of information that may be reported , this guidance will help professionals and researchers with some uniform reporting. However, for systematic reviews of interventions more detailed information may be needed especially in the characterization of the intervention beyond the essential features. For our study, contacting the presenters for additional materials such as Power Point presentations as well as a follow-up interview after locating conference abstracts helped augment the data offered in the abstract and could be recommended as a successful methodology to collect intervention data comparable to those from publications. We found more information about the special event interventions in the areas of intervention description such as behavioral change theories used, delivery (e.g., deliverers, implementation steps, recruitment methods), process evaluation data and cost information. Cost data is extremely important for the practice community since they would like to have cost analysis for different inventions in their decision making for intervention choices in addition to effectiveness . This methodology of follow-up with authors has been documented as a strategy to obtain missing data found in articles in the conduct of systematic reviews, particularly through email  and should be recommended to enhance data obtained from abstracts of conferences for grey literature reviews. However, challenges to including grey literature, including additional research costs for further systematic data collection from unpublished sources and staff time, should be considered .
There are several limitations to this study. While the review team covered the spectrum of national cancer conferences with a practice focus, the conferences found were not comprehensive based on geography spread and years searched. This was true at the regional and local levels. Data were also limited by conferences that did not have past copies of proceedings or abstracts for review. The dissertation search was delimited in terms of being based in the US and its publication year. In addition, the team did not review internet sites or reports which are another source of grey literature . In addition, we limited the searches to those sources only in English. Internet sites were not reviewed since the study team believed that they were less likely to have a rich description of one particular special event but were more likely to discuss them in general.
This research adds to the knowledge about how special events are employed to promote and facilitate cancer screening. Further evaluation and dissemination of the outcomes of such events will help to prove their effectiveness, especially for specific types of events (e.g., health fairs). In addition, this study demonstrates the contribution of grey literature to systematic reviews in terms of yielding significantly more events and understanding of that type of intervention to complement published findings. It is recommended that for interventions often conducted in community settings to include a review of grey literature sources to expand the knowledge base of that intervention. Finally, for this study, we developed a systematic method for conducting a grey literature review based on a few guidance tools. For example, we decided to conduct interview to collect more specific data about the event in addition to the information provided in the conference abstract. More examination of how to conduct grey literature reviews should be published and elucidate areas such as sources for reviews, different methods for abstracting data from each source, and common indicators to track. While guidance on grey literature review exists, it is general and further research could help professionals interested in conducting a grey literature review . Future research and evaluation of specific categories of special events (e.g., health fairs, parties/receptions) are needed to yield a greater understanding of the components and effectiveness of types of events that occur more commonly in communities.
This publication was supported by the Centers for Disease Control and Prevention (U48DP001909) and was supported by the National Cancer Institute of the National Institutes of Health under Award Number R25CA163184 (Jean Forster, PhD, MPH and Kola Okuyemi, MD, MPH, Co-PIs). The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the National Institutes of Health or Centers for Disease Control and Prevention.
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