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International audience; Background: Africa and the Caribbean are projected to have greater increases in Head and neck cancer (HNC) burden in comparison to North America and Europe. The knowledge needed to reinforce prevention in these populations is limited. We compared for the first time, incidence rates of HNC in black populations from African, the Caribbean and USA. Methods: Annual age-standardized incidence rates (IR) and 95% confidence intervals (95%CI) per 100,000 were calculated for 2013-2015 using population-based cancer registry data for 14,911 HNC cases from the Caribbean (Barbados, Guadeloupe, Trinidad and Tobago, N = 443), Africa (Kenya, Nigeria, N = 772) and the United States (SEER, Florida, N = 13,696). We compared rates by sub-sites and sex among countries using data from registries with high quality and completeness. Results: In 2013-2015, compared to other countries, HNC incidence was highest among SEER states (IR: 18.2, 95%CI = 17.6-18.8) among men, and highest in Kenya (IR: 7.5, 95%CI = 6.3-8.7) among women. Nasopharyngeal cancer IR was higher in Kenya for men (IR: 3.1, 95%CI = 2.5-3.7) and women (IR: 1.5, 95% CI = 1.0-1.9). Female oral cavity cancer was also notably higher in Kenya (IR = 3.9, 95%CI = 3.0-4.9). Blacks from SEER states had higher incidence of laryngeal cancer (IR: 5.5, 95%CI = 5.2-5.8) compared to other countries and even Florida blacks (IR: 4.4, 95%CI = 3.9-5.0). Conclusion: We found heterogeneity in IRs for HNC among these diverse black populations; notably, Kenya which had distinctively higher incidence of nasopharyngeal and female oral cavity cancer. Targeted etiological investigations are warranted considering the low consumption of tobacco and alcohol among Kenyan women. Overall, our findings suggest that behavioral and environmental factors are more important determinants of HNC than race.

Background Readmission after coronary artery bypass graft (CABG) surgery is associated with adverse outcomes and significant healthcare costs, and 30-day readmission rate is considered as a key indicator of the quality of care. This study aims to: quantify rates of readmission within 30 days of CABG surgery; explore the causes of readmissions; and investigate how patient- and hospital-level factors influence readmission. Methods We conducted systematic searches (until June 2020) of PubMed and Embase databases to retrieve observational studies that investigated readmission after CABG. Random effect meta-analysis was used to estimate rates and predictors of 30-day post-CABG readmission. Results In total, 53 studies meeting inclusion criteria were identified, including 8,937,457 CABG patients. The pooled 30-day readmission rate was 12.9% (95% CI: 11.3–14.4%). The most frequently reported underlying causes of 30-day readmissions were infection and sepsis (range: 6.9–28.6%), cardiac arrythmia (4.5–26.7%), congestive heart failure (5.8–15.7%), respiratory complications (1–20%) and pleural effusion (0.4–22.5%). Individual factors including age (OR per 10-year increase 1.12 [95% CI: 1.04–1.20]), female sex (OR 1.29 [1.25–1.34]), non-White race (OR 1.15 [1.10–1.21]), not having private insurance (OR 1.39 [1.27–1.51]) and various comorbidities were strongly associated with 30-day readmission rates, whereas associations with hospital factors including hospital CABG volume, surgeon CABG volume, hospital size, hospital quality and teaching status were inconsistent. Conclusions Nearly 1 in 8 CABG patients are readmitted within 30 days and the majority of these are readmitted for noncardiac causes. Readmission rates are strongly influenced by patients’ demographic and clinical characteristics, but not by broadly defined hospital characteristics.

Background The etiology of follicular lymphoma (FL), a common non-Hodgkin lymphoma subtype, is largely unknown. Objective We performed a systematic review and meta-analysis of observational studies examining the relationship between occupational exposures and FL risk. Methods We searched Ovid MEDLINE, Ovid EMBASE, and Web of Science for eligible observational studies examining job titles or occupational exposures prior to January 1, 2020. We performed a narrative synthesis and used random-effects models to generate meta-estimates of relative risk (RR) with 95% confidence intervals (95%CI) for exposures reported by three or more studies. Results Fifty-eight studies were eligible. Ten cohort and 37 case-control studies quantified FL risk in relation to any exposure to one or more occupational groups or agents. Eight cohort and 19 case-control studies examined dose-response relationships. We found evidence of a positive association with increasing plasma concentration of dichlorodiphenyldichloroethylene (DDE; meta-RR = 1.51, 95%CI = 0.99, 2.31; I2 = 0.0%) and polychlorinated biphenyls (PCBs; meta-RR = 1.47, 95%CI = 0.97, 2.24; I2 = 8.6%). We observed a positive association with exposure to any solvent (meta-RR = 1.16, 95%CI = 1.00, 1.34; I2 = 0.0%) and chlorinated solvents (meta-RR = 1.35, 95%CI = 1.09, 1.68; I2 = 0.0%). Single studies reported a significant positive dose-response association for exposure to any pesticide, hexachlorobenzene, any organophosphate, diazinon, metolachlor, carbaryl, lindane, trichloroethylene, oils/greases, and extremely low-frequency magnetic fields. Job title-only analyses suggested increased risk for medical doctors and spray painters, and decreased risk for bakers and teachers. Overall, studies demonstrated low risk of bias, but most studies examined small numbers of exposed cases. Conclusions Current evidence indicates a positive association between FL and occupational exposure to DDE, PCBs, any solvent and chlorinated solvents. Our findings may help guide policies and practices on the safe use of solvents and inform models of lymphomagenesis. Future studies with larger sample sizes and comprehensive quantitative exposure measures may elucidate other avoidable carcinogenic exposures.

Background The Nigerian HIV Geriatric Cohort (NHGC) is a longitudinal cohort setup to learn how elderly people living with HIV (EPLHIV) in Nigeria fare, despite not being prioritized by the national treatment program, and to deepen knowledge for their differentiated care and achieve better outcomes. In this paper, we describe data collected on sociodemographic and clinical data from EPLHIV from the inception of Nigeria’s national HIV program to 2018. Methods Patient-level data spanning the period 2004 to 2018, obtained from comprehensive HIV treatment hospitals, that are supported by four major PEPFAR-implementing partners in Nigeria were used. These 4 entities collaborated as member organizations of the Nigeria Implementation Science Alliance. We defined elderly as those aged 50 years and above. From deidentified treatment records, demographic and clinical data of EPLHIV ≥50-year-old at ART initiation during the review period was extracted, merged into a single REDcap® database, and described using STATA 13. Results A total of 101,652 EPLHIV were analysed. Women accounted for 53,608 (53%), 51,037 (71%) of EPLHIV identified as married and 33,446 (51%) unemployed. Median age was 57.1 years (IQR 52–60 years) with a median duration on ART treatment of 4.1 years (IQR 1.7–7.1 years). ART profile showed that 97,586 (96%) were on 1st-line and 66,125 (65%) were on TDF-based regimens. Median body mass index (BMI) was 22.2 kg/m2 (IQR 19.5–25.4 kg/m2) with 43,012 (55%), 15,081 (19%) and 6803 (9%) showing normal (BMI 18.5 – 2), overweight (BMI 25 - 2) and obese (BMI ≥30 kg/m2) ranges respectively. Prevalence of hypertension (systolic-BP > 140 mmHg or diastolic-BP > 90 mmHg) was 16,201 (21%). EPLHIV median CD4 count was 381 cells/μL (IQR 212–577 cells/μL) and 26,687 (82%) had a viral load result showing Conclusions This cohort describes the clinical and non-clinical profile of EPLHIV in Nigeria. We are following up the cohort to design and implement intervention programs, develop prognostic models to achieve better care outcomes for EPLHIV. This cohort would provide vital information for stakeholders in HIV prevention, care and treatment to understand the characteristics of EPLHIV.

To investigate the relationship between follicular lymphoma (FL) risk and common modifiable lifestyle factors, specifically smoking, alcohol, body mass index (BMI), and hair dye use. We performed a systematic review and meta-analysis of observational studies published prior to 01 January 2020. We searched Ovid MEDLINE, Ovid EMBASE, and Web of Science and the reference lists of original studies and review articles. We used random-effects models to generate meta-estimates of relative risk (RR) with 95% confidence intervals (95% CI). Twenty-four cohort and ten case–control studies were eligible. Ten articles examined smoking, 11 alcohol, 13 BMI, and four hair dye use and risk of FL. The meta-estimate for current smoking was 1.11 (95% CI 0.92–1.35; I2 = 51%) and there was no significant dose–response per 5-year increase in duration (p-trend = 0.087). Current alcohol intake was inversely associated with FL risk (meta-RR 0.87, 95% CI 0.81–0.94; I2 = 0%) and there was a significant dose–response per 5 drinks/week increase in intake (p-trend = 0.008). There was no association with 5 kg/m2 increase in early adulthood BMI (meta-RR 1.05, 95% CI 0.91–1.20; I2 = 7%) or being overweight (meta-RR 0.99, 95% CI 0.92–1.07; I2 = 0%) or obese (meta-RR 1.08, 95% CI 0.99–1.17; I2 = 0%) as an adult. Hair dye use before 1980 was positively associated with FL risk (meta-RR 1.66, 95% CI 1.22–2.25; I2 = 55%) and no evidence of effect after 1980. We found consistent evidence of an inverse association between current alcohol intake and FL risk, and a significant increased risk with hair dye use before 1980. The evidence for smoking is heterogeneous, but most studies did not support an association. Further research is required to understand the mechanisms underlying these associations and the potential for prevention strategies.

OBJECTIVE: We explored determinants of attrition a longitudinal cohort study in Nigeria. STUDY DESIGN AND SETTING: We enroled 1,020 women into a prospective study. Of these, 973 were eligible to return for follow-up. We investigated the determinants of attrition among eligible women using a sequential mixed methods design. We used logistic regression models to compare the baseline characteristics of responders and non-responders. At the end of the parent study, we conducted 4 focus group discussions and 8 key informant interviews with non-responders RESULTS. Of the 973 women included in the quantitative analysis, 26% were non-responders. From quantitative analysis, older women were less likely to drop out than younger women (reference: women ≤30 years; OR 0.46; 95%CI 0.30 – 0.70, p

Information on cancer stage at diagnosis is largely missing or poorly documented among population-based cancer registries in sub-Saharan Africa (SSA). In an early field trial of Essential TNM staging, it was observed that some training was needed to enable cancer registrars to abstract the correct TNM from case records. In November 2018, the Addis Ababa City Cancer Registry hosted a training course attended by 17 participants from 16 cancer registries in SSA. The participants were asked to stage 16 cancer cases (from anonymized photocopies of case records obtained from the Global Initiative for Cancer Registry Development) before and after the training. The discrepancy of the stages from before and after were scored and compared. Results showed that there was a substantial improvement in the participants' performance after the training. The application of the Essential TNM staging system, with training in its use, would allow cancer registrars in SSA to abstract cancer stage at diagnosis in a clinically recognized format, which is crucial for cancer control and public health care policy making.

Obesity is associated with detrimental changes in cardiovascular and metabolic parameters, including blood pressure, dyslipidemia, markers of systemic inflammation, and insulin resistance. In the elderly living with the human immunodeficiency virus (EPLHIV), and being treated with antiretroviral medications, the obesity complications escalate and expose the elderly to the risk of noncommunicable diseases. Given that over 3 million EPLHIV in sub-Sahara Africa, we assessed the prevalence of obesity and its associated factors among EPLHIV in a low-resource setting. This was a cross sectional study of EPLHIV aged 50 years and older, being treated with antiretroviral medications from 2004 to 2018. HIV treatment data collected from multiple treatment sites were analyzed. Baseline characteristics of the participants were described, and multivariable relative risk model was applied to assess the associations between obesity (body mass index [BMI] ≥30 kg/m2) and the prespecified potential risk factors. Of the 134,652 in HIV cohort, 19,566 (14.5%) were EPLHIV: 12,967 (66.3%) were normal weight (18.5 ≤ BMI

Background Genital warts are important causes of morbidity and their prevalence and incidence can be used to evaluate the impact of HPV vaccination in a population. Methods We enrolled 1020 women in a prospective cohort study in Nigeria and followed them for a mean (SD) of 9 (4) months. Nurses conducted pelvic examinations and collected ectocervical samples for HPV testing. We used exact logistic regression models to identify risk factors for genital warts. Results The mean age of study participants was 38 years, 56% (535/962) were HIV-negative and 44% (427/962) were HIV-positive. Prevalence of genital warts at enrolment was 1% (4/535) among HIV-negative women, and 5% (23/427) among HIV-positive women. Of 614 women (307 HIV negative and 307 HIV positive women) for whom we could compute genital wart incidence, it was 515 (95% CI:13–2872) per 100,000 person-years in HIV-negative and 1370 (95% CI:283–4033) per 100,000 person-years in HIV-positive women. HIV was associated with higher risk of prevalent genital warts (OR:7.14, 95% CI:2.41–28.7, p

Background: There is exponential growth in the interest and implementation of genomics research in Africa. This growth has been facilitated by the Human Hereditary and Health in Africa (H3Africa) initiative, which aims to promote a contemporary research approach to the study of genomics and environmental determinants of common diseases in African populations. Objective: The purpose of this article is to describe important challenges affecting genomics research implementation in Africa. Methods: The observations, challenges and recommendations presented in this article were obtained through discussions by African scientists at teleconferences and face-to-face meetings, seminars at consortium conferences and in-depth individual discussions. Results: Challenges affecting genomics research implementation in Africa, which are related to limited resources include ill-equipped facilities, poor accessibility to research centers, lack of expertise and an enabling environment for research activities in local hospitals. Challenges related to the research study include delayed funding, extensive procedures and interventions requiring multiple visits, delays setting up research teams and insufficient staff training, language barriers and an underappreciation of cultural norms. While many African countries are struggling to initiate genomics projects, others have set up genomics research facilities that meet international standards. Conclusions: The lessons learned in implementing successful genomics projects in Africa are recommended as strategies to overcome these challenges. These recommendations may guide the development and application of new research programs in low-resource settings.

Introduction Infections by certain viruses, bacteria, and parasites have been identified as risk factors for some cancers. In Nigeria, like many other developing countries, infections remain a leading cause of morbidity and mortality. While there are data on the incidence of different cancers in Nigeria, there has been no study of cancers attributable to infections. This study was carried out to determine the burden of cancers attributable to infections using data from two population-based cancer registries (PBCRs) in Nigeria. Methods We obtained data on cancers associated with EBV, human papillomavirus (HPV), hepatitis B and C, HIV, HHV8, Helicobacter pylori, and Schistosoma spp. from the databases of Abuja and Enugu cancer registries in Nigeria. We used population-attributable fraction for infections-associated cancers in developing countries that are based on prevalence data and relative risk estimates from previous studies. Results The PBCRs reported 4,336 incident cancer cases [age standardized incidence rate (ASR) 113.9 per 100,000] from 2012 to 2014, of which 1,627 (37.5%) were in males and 2,709 (62.5%) were in females. Some 1,030 (23.8%) of these cancers were associated with infections (ASR 44.4 per 100,000), while 951 (22.0%) were attributable to infections (ASR 41.6 per 100,000). Cancers of the cervix (n = 392, ASR 28.3 per 100,000) and liver (n = 145, ASR 3.4 per 100,000); and non-Hodgkin’s lymphoma (n = 110, ASR 2.5 per 100,000) were the commonest infections-associated cancers overall. The commonest infectious agents associated with cancers in this population were HPV, EBV, hepatitis B and C, HIV, and HHV8. Conclusion Our results suggest that 23.8% of incident cancer cases in this population were associated with infections, while 22.0% were attributable to infections. The infections attributable cancers are potentially preventable with strategies, such as vaccination, risk factor modification, or anti-infective treatment.

Introduction HPV attributable cancers are the second most common infection-related cancers worldwide, with much higher burden in less developed regions. There are currently no country-specific estimates of the burden of these cancers in Nigeria just like many other low and middle income countries. Methods In this study, we quantified the proportion of the cancer burden in Nigeria that is attributable to HPV infection from 2012 to 2014 using HPV prevalence estimated from previous studies and data from two population based cancer registries (PBCR) in Nigeria. We considered cancer sites for which there is strong evidence of an association with HPV infection based on the International Agency for Research on Cancer (IARC) classification. We obtained age and sex-specific estimates of incident cancers and using the World Standard Population, we derived age standardized incidence (ASR) rates for each cancer type by categories of sex, and estimated the population attributable fractions (PAF). Results The two PBCR reported 4336 new cancer cases from 2012 to 2014. Of these, 1627 (37.5%) were in males and 2709 (62.5%) in females. Some 11% (488/4336) of these cancers were HPV associated; 2% (38/1627) in men and 17% (450/2709) in women. Of the HPV associated cancers, 7.8% occurred in men and 92.2% in women. The ASRs for HPV associated cancers was 33.5 per 100,000; 2.3 and 31.2 per 100,000 in men and women respectively. The proportion of all cancers attributable to HPV infection ranged from 10.2 to 10.4% (442–453 of 4336) while the proportion of HPV associated cancers attributable to HPV infection ranged from 90.6% to 92.8% (442–453 of the 488 cases). In men, 55.3% to 68.4% of HPV associated cancers were attributable to HPV infection compared to 93.6% to 94.8% in women. The combined ASR for HPV attributable cancers ranged from 31.0 to 31.7 per 100,000. This was 1.4 to 1.7 per 100,000 in men and 29.6 to 30.0 per 100,000 in women. In women, cervical cancer (n = 392, ASR 28.3 per 100,000) was the commonest HPV attributable cancer, while anal cancer (n = 21, ASR 1.2 per 100,000) was the commonest in men. Conclusions HPV attributable cancers constitute a substantial cancer burden in Nigerian women, much less so in men. A significant proportion of cancers in Nigerian women would be prevented if strategies such as HPV DNA based screening and HPV vaccination are implemented.

Background: The burden of cervical cancer remains huge globally, more so in sub-Saharan Africa. Effectiveness of screening, rates of recurrence following treatment and factors driving these in Africans have not been sufficiently studied. The purpose of this study therefore was to investigate factors associated with recurrence of cervical intraepithelial lesions following thermo-coagulation in HIV-positive and HIV-negative Nigerian women using Visual Inspection with Acetic Acid (VIA) or Lugol’s Iodine (VILI) for diagnosis. \ud Methods: A retrospective cohort study was conducted, recruiting participants from the cervical cancer “see and treat” program of IHVN. Data from 6 sites collected over a 4-year period was used. Inclusion criteria were: age ≥18 years, baseline HIV status known, VIA or VILI positive and thermo-coagulation done. Logistic regression was performed to examine the proportion of women with recurrence and to examine factors associated with recurrence. \ud Results: Out of 177 women included in study, 67.8 % (120/177) were HIV-positive and 32.2 % (57/177) were HIV-negative. Recurrence occurred in 16.4 % (29/177) of participants; this was 18.3 % (22/120) in HIV-positive women compared to 12.3 % (7/57) in HIV-negative women but this difference was not statistically significant (p-value 0.31). Women aged ≥30 years were much less likely to develop recurrence, adjusted OR = 0.34 (95 % CI = 0.13, 0.92). Among HIV-positive women, CD4 count

Abstract 63 Background: Cervical cancer is the second most common cancer in Africa. Persistent high-risk human papillomavirus (HRHPV) infection is a necessary cause but little is known about the persistence and associated risk factors of HRHPV infection in African women. We undertook this work to determine risk factors and the incidence of HPV infection in Nigerian women. Methods: ACCME is a multicenter, prospective cohort study of host germline, cervical somatic and HRHPV genomics, epigenomics, and vaginal microenvironment and their association with HPV. From February 2014 to January 2016, 10,000 HIV-negative women were enrolled in the cohort and are being observed every 6 months. We used SPF25/LiPA10 to characterize HPV infection and defined persistent infection as two consecutive positive tests performed at least 12 months apart. Logistic regression models were used to estimate associations between risk factors and persistent HPV. Results: The mean (± standard deviation) age of study participants at baseline was 40 (± 10) years, and mean (± standard deviation) vaginal pH was 5.2 (± 0.6). Approximately 42% of participants were positive for any HPV and 21% had persistence of any HPV infection. Some (35%) participants had multiple infections with any HPV. Approximately 54% of those with persistent any HPV infection had HRHPV—HPV type 52 (25%) and type 18 (15%) were the most prevalent and persistent HRHPV types. Incidence of any HPV infection was 6.6 per 1,000 person-months, whereas that of HRHPV was 2.6 per 1,000 person-months. Age, body mass index, education level, marital and socioeconomic status, and total number of lifetime sexual partners were associated with HPV infection in these women. Conclusion: We defined the incidence, risk factors, and most common types of HRHPV in a large cohort of women in West Africa. AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST Sally N. Adebamowo No relationship to disclose Michael Odutola No relationship to disclose Ayotunde Famooto No relationship to disclose Eileen Dareng No relationship to disclose Amos Adebayo No relationship to disclose Peter Achara No relationship to disclose Bunmi Alabi No relationship to disclose Kayode Obende No relationship to disclose Richard Offiong No relationship to disclose Sanni Ologun No relationship to disclose Clement A. Adebamowo Speakers' Bureau: Merck

ObjectiveIn low resource settings, visual inspection with acetic acid (VIA) by allied health workers, has been suggested as an alternative for cervical cancer screening. However, there are concerns about the objectivity and time to diagnostic concordance with specialists. We evaluated the secular trend in interobserver agreement between nurse providers and a gynecologist/colposcopist over a five-year period.MethodsNurses provided VIA screening with digital cervivography to 4,961 participants in five screening clinics from October 2010 to May 2014 in Nigeria in this observational study. Cervigraphs were reviewed at meetings where a gynaecologist/colposcopist made an assessment from the cervigraphs. We used weighted kappa statistics to calculate agreement in diagnosis between nurse providers and the gynecologist/colposcopist; linear regression models to examine overall trend and investigate potential clinic characteristics that may influence agreement; and time series models to characterize month to month variations.ResultsMean age of participants was 37±8 years. Overall agreement was 0.89 at Site D, 0.78 and 0.73 at Sites A and C respectively, 0.50 for Site E and 0.34 for Site C. The number of trainings attended by nurse providers(β = 0.47,95%CI:0.02-0.93, p = 0.04), high level of engagement by site gynecologists(β = 0.11,95%CI:0.01-0.21,p = 0.04) were associated with increased agreement; while increasing distance from the coordinating site(β = -0.47,95%CI:-0.92-0.02,p = 0.04) was associated with decreased agreement. There were no associations between number of years screening clinics were operational(β = 0.01,95%CI: -0.01-0.03,p = 0.29), cumulative experience of nurse providers(β = 0.04,95%CI:-0.03-0.12,p = 0.19) and agreement. There were no significant increases in weighted kappa statistics over time for all sites considered. Monthly variations were significant for only one of two sites considered in time series models (AR1 term = -0.40, 95%CI:-0.71-0.09,p = 0.01).ConclusionOur results showed a lack of objectivity, persistent variation and lack of convergence of diagnostic capabilities of nurse led VIA cervical cancer screening with the diagnostic capabilities of a specialist in a cervical cancer screening program in Nigeria.

The consequences of the HIV epidemic on cancer epidemiology are sparsely documented in Africa. We aimed to estimate the association between HIV infection and selected types of cancers among patients hospitalized for cancer in four West African countries. A case-referent study was conducted in referral hospitals of Benin, Côte d'Ivoire, Nigeria and Togo. Each participating clinical ward included all adult patients seeking care with a confirmed diagnosis of cancer. All patients were systematically screened for HIV infection. HIV prevalence of AIDS-defining and some non-AIDS defining cancers (Hodgkin lymphoma, leukaemia, liver, lung, skin, pharynx, larynx, oral cavity and anogenital cancers) were compared to a referent group of cancers reported in the literature as not associated with HIV. Odds ratios adjusted on age, gender and lifetime number of sexual partners (aOR) and their 95% confidence intervals (CI) were estimated. Among the 1,644 cancer patients enrolled, 184 (11.2%) were identified as HIV-infected. The HIV prevalence in the referent group (n=792) was 4.4% [CI 3.0–5.8]. HIV infection was associated with Kaposi sarcoma (aOR 34.6 [CI: 17.3–69.0]), non-Hodgkin lymphoma (aOR 3.6 [CI 1.9–6.8]), cervical cancer (aOR 4.3 [CI 2.2–8.3]), anogenital cancer (aOR 17.7 [CI 6.9–45.2]) and squamous cell skin carcinoma (aOR 5.2 [CI 2.0–14.4]). A strong association is now reported between HIV infection and Human Papillomavirus (HPV)-related cancers including cervical cancer and anogenital cancer. As these cancers are amenable to prevention strategies, screening of HPV-related cancers among HIV-infected persons is of paramount importance in this African context.

Abstract 66 Sexual behaviour is an important risk factor for HPV associated cancers, which include nearly all cervical cancers, most anal cancers, and many oropharyngeal, vaginal, vulvar and penile cancers. However, in studies assessing risk of sexual behaviour and disease in low and middle income countries, there are often questions about the validity of self-reported sexual behaviour. In this study, we evaluate the reliability of self-reported sexual history among participants in a cervical cancer and HPV study in Nigeria. We studied 720 participants in a prospective cohort. We collected general sexuality and specific sexual practices information at study entry and administered the same questions at follow up after a mean period of 8.6 months. To assess reliability, we used the root mean squared approach to calculate within-person coefficient of variation(CVw) and calculated the intra-class correlation coefficient (ICC) using a two way, mixed effects model (continuous variables) and κ statistics (discrete variables). Of the 720 participants, 48.1% were HIV+, 49.2% were HIV- and 2.8% were unaware of their status. Agreement was higher for HIV- women than HIV+ women. Agreement for ever engaged in oral sex was moderate for HIV- women (κ = 0.56, 95%CI = 0.49 – 0.70) and fair for HIV+ women (κ = 0.37, 95%CI = 0.24 – 0.54). Similarly, agreement for ever engaging in anal sex was good among HIV- women (κ = 0.61, 95%CI = 0.10 – 0.83) and poor among HIV+ women (κ = 0.19, 95%CI = 0.10 – 0.60). Overall, the within person variability for age at sexual debut for vaginal sex (CVw =10.7, 95%CI = 10.6 – 10.7) and oral sex (CVw= 11.5, 95%CI = 11.5 – 11.6) was low. In contrast, the variability was much higher for lifetime number of partners for vaginal sex (CVw =35.2, 95% CI = 35.1 – 35.3) and oral sex (CVw = 34.0, 95%CI = 34.0– 34.1). We found report of sexual behaviour was more reliable among HIV- women than HIV+ women, and self-report of ever engaged in a sexual practice and age at initiation were more reliable than reports of frequency or number of partners. AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST: No COIs from the authors.

5524Background: Cervical cancer is the second commonest cancer in Africa. Much remains unknown about the prevalence and pathogenicity of human papilloma virus (HPV) types, mechanism of disease and ...

Abstract 60 Background: Infections by certain viruses, bacteria, and parasites have been identified as risk factors for some cancers. In 2008, there were 12.7 million new cancer cases worldwide. About 2 million of these new cases were attributable to infections, which represent 16.1% of new cancer cases. The majority of these cancers occurred in less-developed regions of the world, where the Population Attributable Fraction (PAF) was estimated to be 23%. We carried out this study to evaluate the numbers of cancers in Nigeria from 2012-2014 that are attributable to infections using data from Population Based Cancer Registries (PBCR) in Nigeria. Methods: We considered cancers associated with Epstein-Barr virus (EBV), Human Papilloma Virus (HPV), Hepatitis B and C Virus (HBV/HCV), Human Immunodeficiency Virus and Human Herpes Virus 8 (HIV/HHV8), Helicobacter pylori, and Schistosoma haematobium that have been classified as oncogenic by IARC. We obtained data on the infection-associated cancers from registry databases of 3 PBCRs in Nigeria: Abuja, Enugu, and Calabar cancer registries. We used PAF for infectious agents associated cancers in developing countries, which were calculated using prevalence data and relative risk estimates in previous studies: EBV and Nasopharyngeal (90%), and Hodgkin's Lymphoma (80%); HPV and Cervical (100%), Vulval and Vaginal (40%), Anal (90%) and Oropharyngeal cancer (12%) in women; Penile (40%), Anal (90%) and Oropharyngeal cancer (12%) in men; HBV/HCV and Liver (92%), HIV/HHV8 and Kaposi sarcoma (100%), Non Hodgkin Lymphoma (100%); H. pylori and stomach (74%) and S. haematobium and Bladder cancer (56.6%). Results: The 3 PBCRs reported 4,861 cancer cases from 2012-2014: 1,875 male cases and 2,986 female cases. There were 412 infection-associated cancers in males accounting for 22% of total cancers in males, and 351 (85%) of these were attributable to infections. In females, there were 727 infection-associated cancers accounting for 24% of total cancers in females, and 674 (93%) of these were attributable to infections. Cancers of the Cervix (n=430), Liver (n=152), and Non-Hodgkin's Lymphoma (n=129) were the most common infection-associated cancers in both sexes. The most common infectious agents associated with cancers were HPV (n=453), HIV/HHV8 (n=199), HBV/HCV (n=143) and EBV (n=125). Conclusion: Our findings suggest that 85% of infection-associated cancers in males and 93% infection-associated cancers in females in Nigeria can be prevented with vaccination, safer risk behaviors, or anti-infective treatments. AUTHORS' DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST: Michael Kolawole Odutola No relationship to disclose Elima Jedy-Agba No relationship to disclose Emmanuel Oga No relationship to disclose Festus Igbinoba Travel, Accommodations, Expenses: AstraZeneca Theresa Otu No relationship to disclose Emmanuel Ezeome Honoraria: Roche Travel, Accommodations, Expenses: Roche Ima-Obong Ekanem No relationship to disclose Ramatu Hassan No relationship to disclose Clement Adebamowo Speakers' Bureau: Merck

E. Oga, J. Brown, C. Brown, E. Dareng, V. Adekanmbi, M. Odutola, O. Olaniyan, R.A. Offiong, K. Obende, S. Adewole, P. Achara, P. Dakum, C. Adebamowo; Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD/US, University of Maryland, Baltimore, MD/US, Institute of Human Virology Nigeria, Abuja, NG, National Hospital, Abuja, NG, University of Abuja Teaching Hospital, Abuja, NG, Garki Hospital Abuja, Abuja, NG, Mother and Child Hospital, Ondo, NG, Federal Medical Centre Keffi, Keffi, NG