Benign breast disease and breast cancer risk in African women: a case-control study.

PURPOSE: To examine the association between benign breast disease (BBD) and breast cancer (BC) in a heterogeneous population of African women. METHODS: BC cases and controls were enrolled in three sub-Saharan African countries, Nigeria, Cameroon, and Uganda, between 1998 and 2018. Multivariable logistic regression was used to test the association between BBD and BC. Risk factors dually associated with BBD and BC were selected. Using a parametric mediation analysis model, we assessed if selected BC risk factors were mediated by BBD. RESULTS: Of 6,274 participants, 55.6% (3,478) were breast cancer cases. 360 (5.7%) self-reported BBD. Fibroadenoma (46.8%) was the most commonly reported BBD. Women with a self-reported history of BBD had greater odds of developing BC than those without (adjusted odds ratio [aOR] 1.47, 95% CI 1.13-1.91). Biopsy-confirmed BBD was associated with BC (aOR 2.25, 95% CI 1.26-4.02). BBD did not significantly mediate the effects of any of the selected BC risk factors. CONCLUSIONS: In this study, BBD was associated with BC and did not significantly mediate the effects of selected BC risk factors.

Connaissances, attitudes et pratiques des professionnels de santé sur le cancer du col de l'utérus au Cameroun.

INTRODUCTION: Cervical cancer is the cause of 311,000 deaths each year worldwide and 1,540 deaths in Cameroon. It is a public health problem, but only one in ten women is screened for cervical cancer screening in Cameroon. Little data is available on the KAPs of health professionals in the Mifi Health District, in the west Region of Cameroon. The objective of this study was to assess the knowledge, attitudes and practices of these professionals vis-à-vis cervical cancerResults: Overall, 200 health professionals were interviewed. Regarding the knowledge of the cause of cervical cancer, only 35% of participants were able to declare HPV. With regards to prevention measures, 32% of health professionals knew HPV vaccine. Regarding the perception of the disease; 79.3% of Physicians evoked cervical cancer as severe disease. Concerning the practice of screening, only 15% of health professionals routinely advise screening. CONCLUSION: Health workers in the health district of Mifi have poor knowledge on cervical cancer and weak practice of screening. Training of health professionals and the development of cervical cancer screening units are needed.

Facteurs associés aux barrières d'accès au dépistage du cancer du col de l'utérus à Yaoundé.

INTRODUCTION: Several studies report that only 10% of Cameroonian women at risk have ever been screened for this disease. OBJECTIVE: This study aims to analyze the factors explaining the difficulties in accessing screening for cervical cancer in Yaoundé, Cameroon. METHODOLOGY: This was an analytical cross-sectional study (participed/not participated), conducted from May 1 to August 10, 2020. The study population was made up of two groups (i.e. women without a history of screening; women who benefited from at least one screening session). Data collection was carried out at the gynecology-obstetrics department in two hospitals in Yaoundé (University hospital center and the obstetrics-gynecology and pediatric hospital). Variables were collected using a pre-tested and validated questionnaire. Data were analyzed using SPSS version 20 software. Simple and multiple logistic regression analysis was performed to assess the influence of different variables on the risk of not participating in screening. A difference was considered significant if P < 5%. RESULTS: Out of 300 women interviewed, 150 had never participated in screening (50%). In multivariate analysis, the factors associated with difficulties in accessing cervical cancer screening were, level of primary education (58,33% vs. 41,67%, [AOR: 5.12 (3.42-7.65)]), lack of employment (69,74% vs. 30,26%, [AOR: 5.44 (3.32-8.92)]), insufficient knowledge (78,64% vs. 21,36%; [AOR: 7.11(5.70-8.88)]) and unfavourable attitude (85,71% vs. 14,29%, [AOR: 5.58 (4.41-7.06)]). CONCLUSION: There are many factors associated with not being screened. It is therefore necessary to develop strategies to improve access to cervical cancer screening services in Cameroon.

[Knowledge, attitudes and practices of health professionals regard to cervical cancer in Cameroon]. / Connaissances, attitudes et pratiques des professionnels de santé sur le cancer du col de l'utérus au Cameroun.

INTRODUCTION: Cervical cancer is the cause of 311,000 deaths each year worldwide and 1,540 deaths in Cameroon. It is a public health problem, but only one in ten women is screened for cervical cancer screening in Cameroon. Little data is available on the KAPs of health professionals in the Mifi Health District, in the west Region of Cameroon. The objective of this study was to assess the knowledge, attitudes and practices of these professionals vis-à-vis cervical cancerResults: Overall, 200 health professionals were interviewed. Regarding the knowledge of the cause of cervical cancer, only 35% of participants were able to declare HPV. With regards to prevention measures, 32% of health professionals knew HPV vaccine. Regarding the perception of the disease; 79.3% of Physicians evoked cervical cancer as severe disease. Concerning the practice of screening, only 15% of health professionals routinely advise screening. CONCLUSION: Health workers in the health district of Mifi have poor knowledge on cervical cancer and weak practice of screening. Training of health professionals and the development of cervical cancer screening units are needed.

Relationship between human leukocyte antigen alleles and risk of Kaposi's sarcoma in Cameroon.

Several studies published to date report associations between human leukocyte antigen (HLA) alleles and different types of Kaposi's Sarcoma (KS). However, there is little concordance between the HLA alleles identified and the populations studied. To test whether HLA alleles associate with KS in a Cameroonian case-control study, we performed high-resolution HLA typing in KSHV seropositive individuals. Among HIV-positive individuals, carriers of HLA-B*14:01 were at a significantly higher risk of AIDS-KS (p = 0.033). For HIV-negative patients, a gene-wise comparison of allele frequencies identified the HLA-B (p = 0.008) and -DQA1 (p = 0.002) loci as possible risk factors for endemic KS. Our study provides additional understanding of genetic determinants of KS and their implications in disease pathogenesis. Further validation of these findings is needed to define the functional relevance of these associations.

Mutual detection of Kaposi's sarcoma-associated herpesvirus and Epstein-Barr virus in blood and saliva of Cameroonians with and without Kaposi's sarcoma.

Kaposi's sarcoma-associated herpesvirus (KSHV) and Epstein-Barr virus (EBV) are prevalent in sub-Saharan Africa, together with HIV; the consequent burden of disease is grave. The cofactors driving transmission of the two viruses and pathogenesis of associated malignancies are not well understood. We measured KSHV and EBV DNA in whole blood and saliva as well as serum antibodies levels in 175 Cameroonians with Kaposi's sarcoma and 1,002 age- and sex-matched controls with and without HIV. KSHV seroprevalence was very high (81%) in controls, while EBV seroprevalence was 100% overall. KSHV DNA was detectable in the blood of 36-46% of cases and 6-12% of controls; EBV DNA was detected in most participants (72-89%). In saliva, more cases (50-58%) than controls (25-28%) shed KSHV, regardless of HIV infection. EBV shedding was common (75-100%); more HIV+ than HIV- controls shed EBV. Cases had higher KSHV and EBV VL in blood and saliva then controls, only among HIV+ participants. KSHV and EBV VL were also higher in HIV+ than in HIV- controls. Cases (but not controls) were more likely to have detectable KSHV in blood if they also had EBV, whereas shedding of each virus in saliva was independent. While EBV VL in saliva and blood were modestly correlated, no correlation existed for KSHV. Numerous factors, several related to parasitic coinfections, were associated with detection of either virus or with VL. These findings may help better understand the interplay between the two gammaherpesviruses and generally among copathogens contributing to cancer burden in sub-Saharan Africa.

Breast cancer risk after full-term pregnancies among African women from Nigeria, Cameroon, and Uganda.

BACKGROUND: The breast cancer (BC) risk profiles of African women differ significantly from those of women of European ancestry. African women are younger at the age of onset and tend to have high parity. The purpose of this study was to examine the relationship between full-term pregnancy (FTP) and the risk of BC. METHODS: A case-control study was conducted among 1995 women with invasive BC and 2631 controls in Nigeria, Cameroon, and Uganda. Odds ratios (ORs) for individual ages at FTP according to the time since delivery were calculated and adjusted for confounders. A fitted spline model was used to assess the impact of the number of pregnancies on BC risk. RESULTS: In comparison with a nulliparous woman, a parous woman with her first FTP at 20 years showed an OR of 0.76 (95% confidence interval [CI], 0.57-0.99) for developing BC in the following 5 years. Ten years later, this risk was 0.76 (95% CI, 0.58-0.99) and 0.76 (95% CI, 0.58-0.98) for women aged 25 and 30 years, respectively. Similarly, a parous woman with 1 pregnancy had an OR of 0.69 (95% CI, 0.49-0.96), whereas the OR was 0.66 (95% CI, 0.48-0.91) with 2 or 5 pregnancies and 0.67 (95% CI, 0.47-0.94) with 6 pregnancies in comparison with nulliparous women. CONCLUSIONS: In contrast to studies in women of European ancestry, this study showed no transient increase in the risk of developing BC after FTP among African women. Further studies are needed to examine the impact of reproductive factors on early-onset BC in African women.

Anticipating and strategizing to address potential bottlenecks during clinical research projects in sub-Saharan Africa: a case for adapting approaches and tools used in the entrepreneurial and development sectors.

Many research funders have invested billions of US dollars in building research capacity in sub-Saharan Africa (SSA). Despite these colossal investments, many well-intentioned and designed clinical research projects have either failed to kick off or ended abruptly. Although obstacles to clinical research in SSA are well known, there is limited information on frameworks and tools that can be used to anticipate and avert these systemic bottlenecks, particularly those related to socio-politics. In this paper, we leveraged lessons from entrepreneurs and development experts in harsh and uncertain business environments to develop a framework for anticipating and addressing potential bottlenecks to clinical research in SSA. More so, to illustrate and build a case for this framework, we shared our experience in supporting clinicians and regulators to adopt a point-of-use care tool, the "chemoPAD," to screen for the quality of anticancer medications rapidly and systematically in Cameroon despite resistance from some stakeholders. The critical steps in this framework involve identifying stakeholders, categorizing them based on their potential reactions to the study (adversary, supporters, and indifferents), and developing critical strategies to engage or deal with each stakeholder's reactions, starting with adversaries. This approach may be useful in complex research projects, especially clinical trials, which often involve many stakeholders with different interests and perceptions.

Using genome and transcriptome data from African-ancestry female participants to identify putative breast cancer susceptibility genes.

African-ancestry (AA) participants are underrepresented in genetics research. Here, we conducted a transcriptome-wide association study (TWAS) in AA female participants to identify putative breast cancer susceptibility genes. We built genetic models to predict levels of gene expression, exon junction, and 3' UTR alternative polyadenylation using genomic and transcriptomic data generated in normal breast tissues from 150 AA participants and then used these models to perform association analyses using genomic data from 18,034 cases and 22,104 controls. At Bonferroni-corrected P < 0.05, we identified six genes associated with breast cancer risk, including four genes not previously reported (CTD-3080P12.3, EN1, LINC01956 and NUP210L). Most of these genes showed a stronger association with risk of estrogen-receptor (ER) negative or triple-negative than ER-positive breast cancer. We also replicated the associations with 29 genes reported in previous TWAS at P < 0.05 (one-sided), providing further support for an association of these genes with breast cancer risk. Our study sheds new light on the genetic basis of breast cancer and highlights the value of conducting research in AA populations.

Genome-wide association analyses of breast cancer in women of African ancestry identify new susceptibility loci and improve risk prediction.

We performed genome-wide association studies of breast cancer including 18,034 cases and 22,104 controls of African ancestry. Genetic variants at 12 loci were associated with breast cancer risk (P < 5 × 10-8), including associations of a low-frequency missense variant rs61751053 in ARHGEF38 with overall breast cancer (odds ratio (OR) = 1.48) and a common variant rs76664032 at chromosome 2q14.2 with triple-negative breast cancer (TNBC) (OR = 1.30). Approximately 15.4% of cases with TNBC carried six risk alleles in three genome-wide association study-identified TNBC risk variants, with an OR of 4.21 (95% confidence interval = 2.66-7.03) compared with those carrying fewer than two risk alleles. A polygenic risk score (PRS) showed an area under the receiver operating characteristic curve of 0.60 for the prediction of breast cancer risk, which outperformed PRS derived using data from females of European ancestry. Our study markedly increases the population diversity in genetic studies for breast cancer and demonstrates the utility of PRS for risk prediction in females of African ancestry.