Search Results Heading

MBRLSearchResults

mbrl.module.common.modules.added.book.to.shelf
Title added to your shelf!
View what I already have on My Shelf.
Oops! Something went wrong.
Oops! Something went wrong.
While trying to add the title to your shelf something went wrong :( Kindly try again later!
Are you sure you want to remove the book from the shelf?
Oops! Something went wrong.
Oops! Something went wrong.
While trying to remove the title from your shelf something went wrong :( Kindly try again later!
    Done
    Filters
    Reset
  • Discipline
      Discipline
      Clear All
      Discipline
  • Is Peer Reviewed
      Is Peer Reviewed
      Clear All
      Is Peer Reviewed
  • Item Type
      Item Type
      Clear All
      Item Type
  • Subject
      Subject
      Clear All
      Subject
  • Year
      Year
      Clear All
      From:
      -
      To:
  • More Filters
74 result(s) for "Denny, Lynette"
Sort by:
Cancer in sub-Saharan Africa: a Lancet Oncology Commission
In sub-Saharan Africa (SSA), urgent action is needed to curb a growing crisis in cancer incidence and mortality. Without rapid interventions, data estimates show a major increase in cancer mortality from 520 348 in 2020 to about 1 million deaths per year by 2030. Here, we detail the state of cancer in SSA, recommend key actions on the basis of analysis, and highlight case studies and successful models that can be emulated, adapted, or improved across the region to reduce the growing cancer crises. Recommended actions begin with the need to develop or update national cancer control plans in each country. Plans must include childhood cancer plans, managing comorbidities such as HIV and malnutrition, a reliable and predictable supply of medication, and the provision of psychosocial, supportive, and palliative care. Plans should also engage traditional, complementary, and alternative medical practices employed by more than 80% of SSA populations and pathways to reduce missed diagnoses and late referrals. More substantial investment is needed in developing cancer registries and cancer diagnostics for core cancer tests. We show that investments in, and increased adoption of, some approaches used during the COVID-19 pandemic, such as hypofractionated radiotherapy and telehealth, can substantially increase access to cancer care in Africa, accelerate cancer prevention and control efforts, increase survival, and save billions of US dollars over the next decade. The involvement of African First Ladies in cancer prevention efforts represents one practical approach that should be amplified across SSA. Moreover, investments in workforce training are crucial to prevent millions of avoidable deaths by 2030. We present a framework that can be used to strategically plan cancer research enhancement in SSA, with investments in research that can produce a return on investment and help drive policy and effective collaborations. Expansion of universal health coverage to incorporate cancer into essential benefits packages is also vital. Implementation of the recommended actions in this Commission will be crucial for reducing the growing cancer crises in SSA and achieving political commitments to the UN Sustainable Development Goals to reduce premature mortality from non-communicable diseases by a third by 2030.
Human Papillomavirus, Human Immunodeficiency Virus and Immunosuppression
► HPV infection and its sequelae are common in HIV-infected women. ► HPV16/18 are found in both HIV-positive and -negative women with cervical cancer. ► Anal cancer and anal cancer precursors are common in HIV-infected women and men. ► HPV infection may increase risk of acquisition of HIV infection. ► Evidence is accruing that male circumcision reduces HPV prevalence. The vast majority of women infected with human immunodeficiency virus (HIV) will be co-infected with human papillomavirus (HPV). The interaction between the two sexually transmitted infections appears to be related to the alteration in cell-mediated immunity in HIV infected persons, increased susceptibility, and possibly reactivation of latent HPV infection. Linkage studies of HIV/AIDs and Cancer registries have indicated a 2- to 22-fold increase in cervical cancer in HIV-positive women compared to HIV-negative women. Data on the prevalence of HPV types in invasive cervical carcinoma (ICC) suggest that the proportion of infection with types HPV16/18 (responsible for over 70% of all cervical cancers) is similar in HIV-negative and HIV-positive women. The biological interaction between HIV and HPV needs further elucidation, although there is some evidence that the presence of HPV infection may be associated with increased HIV transmission. Adolescents perinatally infected by HIV are known to have higher rates of HPV infection and also have been shown to seroconvert in response to HPV vaccination with the quadrivalent vaccine, albeit to lower titers than HIV-negative individuals. Anal cancer incidence is greatly increased in HIV-positive individuals, particularly in HIV-positive men who have sex with men. Screening for anal cancer precursors is feasible and effective; however, the impact on reduction of anal cancer remains to be demonstrated. There are ongoing studies on the safety, immunogenicity, and efficacy of current HPV vaccines in HIV-positive individuals and mature data are awaited. Male circumcision may be another approach to prevention of HPV transmission, which also requires further study. This article forms part of a special supplement entitled “Comprehensive Control of HPV Infections and Related Diseases” Vaccine Volume 30, Supplement 5, 2012.
Point-of-care testing with Xpert HPV for single-visit, screen-and-treat for cervical cancer prevention: a demonstration study in South Africa
Human papillomavirus (HPV)-based screen-and-treat (SAT) is recommended but implementation presents operational challenges. We implemented HPV-SAT at a research site in Khayelitsha, South Africa, screening 3062 women aged 30–65 years (44% women living with HIV [WHIV]). All were screened using point-of-care Xpert HPV and almost all received their HPV results on the same day. HPV-positivity occurred in 41.5% of WHIV and 17.4% of women without HIV (WNoH) reducing to 26.2% in WHIV and 10.4% in WNoH applying treatment eligibility criteria based on high viral load in the channels detecting HPV16, 18, 45, 16, 18, 31, 33, 35, 52, 58. Among those eligible for treatment, 91.3% were considered suitable for ablative therapy, and 94.6% underwent thermal ablation on the same day, with no serious adverse events. Twelve months later, 39.0% of WHIV and 65.2% of WNoH treated with ablative therapy were clear of HPV. In women who were HPV-positive but ineligible for treatment, 19.1% and 12.9% had histologically-confirmed cervical intraepithelial neoplasia grade 2 or worse (CIN2+) at 12 months. SAT programs need to weigh trade-offs between overtreatment versus delayed or no treatment for women who test positive for HPV. Treatment modalities for precancerous lesions need to be improved.
Interventions to close the divide for women with breast and cervical cancer between low-income and middle-income countries and high-income countries
Breast and cervical cancers are the commonest cancers diagnosed in women living in low-income and middle-income countries (LMICs), where opportunities for prevention, early detection, or both, are few. Yet several cost-effective interventions could be used to reduce the burden of these two cancers in resource-limited environments. Population- wide vaccination against human papillomavirus (HPV) linked to cervical screening, at least once, for adult women has the potential to reduce the incidence of cervical cancer substantially. Strategies such as visual inspection with acetic acid and testing for oncogenic HPV types could make prevention of cervical cancer programmatically feasible. These two cancers need not be viewed as inevitably fatal, and can be cured, particularly if detected and treated at an early stage. Investing in the health of girls and women is an investment in the development of nations and their futures. Here we explore ways to lessen the divide between LMICs and high-income countries for breast and cervical cancers.
Infrastructure Requirements for Human Papillomavirus Vaccination and Cervical Cancer Screening in Sub-Saharan Africa
► Primary prevention through HPV vaccination needs appropriate infrastructure. ► A major barrier to vaccine implementation is cost. ► Screening efforts in sub-Saharan Africa have largely focused on visual inspection. ► HPV DNA testing linked to treatment requires a low-cost technology/molecular test. The availability of both human papillomavirus (HPV) vaccination and alternative screening tests has greatly improved the prospects of cervical cancer prevention in sub-Saharan African (SSA) countries. The inclusion of HPV vaccine in the portfolio of new vaccines offered by the Gobal Alliance for Vaccines and Immunization (GAVI) to GAVI-eligible countries has vastly improved the chances of introducing HPV vaccination. Further investments to improve vaccine storage, distribution and delivery infrastructure and human resources of the Extended Programme of Immunization will substantially contribute to the faster introduction of HPV vaccination in SSA countries through both school- and campaign-based approaches. Alternative methods to cytology for the prevention of cervical cancer through the early detection and treatment of cervical cancer precursors have been extensively evaluated in the past 15 years, in Africa as well as in other low-resource settings. Visual inspection with 3–5% dilute acetic acid (VIA) and HPV testing are the two alternative screening methods that have been most studied, in both cross-sectional and randomised clinical trials. VIA is particularly suitable to low-resource settings; however, its efficacy in reducing cervical cancer is likely to be significantly lower than HPV testing. The introduction of VIA screening programmes will help develop the infrastructure that will, in turn, facilitate the introduction of affordable HPV testing in future. Links with the existing HIV/AIDS control programmes is another strategy to improve the infrastructure and screening services in SSA. Infrastructural requirements for an integrated approach aiming to vaccinate single-year cohorts of girls in the 9–13 years age-range and to screen women over 30 years of age using VIA or affordable rapid HPV tests are outlined in this manuscript. This article forms part of a regional report entitled “Comprehensive Control of HPV Infections and Related Diseases in the Sub-Saharan Africa Region” Vaccine Volume 31, Supplement 5, 2013. Updates of the progress in the field are presented in a separate monograph entitled “Comprehensive Control of HPV Infections and Related Diseases” Vaccine Volume 30, Supplement 5, 2012.
Costs, affordability, and feasibility of an essential package of cancer control interventions in low-income and middle-income countries: key messages from Disease Control Priorities, 3rd edition
Investments in cancer control—prevention, detection, diagnosis, surgery, other treatment, and palliative care—are increasingly needed in low-income and particularly in middle-income countries, where most of the world's cancer deaths occur without treatment or palliation. To help countries expand locally appropriate services, Cancer (the third volume of nine in Disease Control Priorities, 3rd edition) developed an essential package of potentially cost-effective measures for countries to consider and adapt. Interventions included in the package are: prevention of tobacco-related cancer and virus-related liver and cervical cancers; diagnosis and treatment of early breast cancer, cervical cancer, and selected childhood cancers; and widespread availability of palliative care, including opioids. These interventions would cost an additional US$20 billion per year worldwide, constituting 3% of total public spending on health in low-income and middle-income countries. With implementation of an appropriately tailored package, most countries could substantially reduce suffering and premature death from cancer before 2030, with even greater improvements in later decades.
Chapter 8: Screening for cervical cancer in developing countries
Organised and quality assured cytology-based screening programmes have substantially reduced cervical cancer incidence in many developed countries. However, there are considerable barriers to setting up cytology-based screening programs, particularly in developing countries. This has stimulated the search for novel and alternative approaches to cytology for cervical cancer prevention. These approaches generally perform as well as cytology, and sometimes better, although many of them have a lower specificity, resulting in higher false-positive rates. The possibility of linking screening to treatment in a one- or two-visit strategy appears to be safe, feasible and effective. Barriers to establishing screening programs and the pitfalls encountered differ from one country to the next. Country-specific solutions need to be found, while being cognisant of the criteria that have enabled successful screening programmes.
Challenges and opportunities in cancer control in Africa: a perspective from the African Organisation for Research and Training in Cancer
Sub-Saharan Africa has a disproportionate burden of disease and faces a major public-health challenge from non-communicable diseases. Although infectious diseases continue to afflict Africa, the proportion of the overall disease burden in sub-Saharan Africa attributable to cancer is rising. The region is predicted to have a greater than 85% increase in cancer burden by 2030. Approaches to minimise the burden of cancer in sub-Saharan Africa in the past few years have had little success because of low awareness of the cancer burden and a poor understanding of the potential for cancer prevention. Success will not be easy, and will need partnerships and bridges to be built across countries, economies, and professions. A strategic approach to cancer control in sub-Saharan Africa is needed to build on what works there and what is unique to the region. It should ideally be situated within strong, robust, and sustainable health-care systems that offer quality health care to all people, irrespective of their social or economic standing. However, to achieve this will need new leadership, critical thinking, investment, and understanding. We discuss the present situation in sub-Saharan Africa and propose ideas to advance cancer control in the region, including the areas of cancer awareness, advocacy, research, workforce, care, training, and funding.
Comprehensive Control of Human Papillomavirus Infections and Related Diseases
•HPV is globally prevalent and related to at least 6 different cancer sites in women and men•Prevention of HPV infections and its consequences is now technologically feasible•Novel options for prevention include HPV vaccination and the use of HPV screening methods•Vaccination is cost-effective with high efficacy for HPV infection and disease•International major efforts are needed to extend HPV-related cancer prevention to developing countries Infection with human papillomavirus (HPV) is recognized as one of the major causes of infection-related cancer worldwide, as well as the causal factor in other diseases. Strong evidence for a causal etiology with HPV has been stated by the International Agency for Research on Cancer for cancers of the cervix uteri, penis, vulva, vagina, anus and oropharynx (including base of the tongue and tonsils). Of the estimated 12.7 million new cancers occurring in 2008 worldwide, 4.8% were attributable to HPV infection, with substantially higher incidence and mortality rates seen in developing versus developed countries. In recent years, we have gained tremendous knowledge about HPVs and their interactions with host cells, tissues and the immune system; have validated and implemented strategies for safe and efficacious prophylactic vaccination against HPV infections; have developed increasingly sensitive and specific molecular diagnostic tools for HPV detection for use in cervical cancer screening; and have substantially increased global awareness of HPV and its many associated diseases in women, men, and children. While these achievements exemplify the success of biomedical research in generating important public health interventions, they also generate new and daunting challenges: costs of HPV prevention and medical care, the implementation of what is technically possible, socio-political resistance to prevention opportunities, and the very wide ranges of national economic capabilities and health care systems. Gains and challenges faced in the quest for comprehensive control of HPV infection and HPV-related cancers and other disease are summarized in this review. The information presented may be viewed in terms of a reframed paradigm of prevention of cervical cancer and other HPV-related diseases that will include strategic combinations of at least four major components: 1) routine introduction of HPV vaccines to women in all countries, 2) extension and simplification of existing screening programs using HPV-based technology, 3) extension of adapted screening programs to developing populations, and 4) consideration of the broader spectrum of cancers and other diseases preventable by HPV vaccination in women, as well as in men. Despite the huge advances already achieved, there must be ongoing efforts including international advocacy to achieve widespread—optimally universal—implementation of HPV prevention strategies in both developed and developing countries. This article summarizes information from the chapters presented in a special ICO Monograph ‘Comprehensive Control of HPV Infections and Related Diseases’ Vaccine Volume 30, Supplement 5, 2012. Additional details on each subtopic and full information regarding the supporting literature references may be found in the original chapters.
HPV vaccine introduction and implementation in Low- and Middle-Income Countries
High-income countries are using a combination of high-quality cervical cancer screening and HPV vaccination in the drive for reduction of cervical cancer incidence and mortality. The WHO call for the Elimination of Cervical Cancer using the three-pronged approach of HPV vaccination (90% of girls immunized against HPV by age 15 years), 70% women screened with a high-quality screening test at ages 35 and 45 years and 90% of women identified with cervical disease receive treatment (90% of women with precancer treated and 90% of women with cervical cancer managed), is expected to be able to eliminate cervical cancer within a century with over 62 million cases of cervical cancer averted by 2120 [3]. Key lessons learned from the introduction of HPV vaccination programs in LMICs include the following: [1] Identification of the target age group – either using a grade-based or age-based approach to identify girls, with grade-based selection being more feasible; [2] School – based delivery strategy enables focus on adolescent children versus young children recruited to EPI programs; [3] Obtaining Political Support and this is evidenced by the African Regional Strategic Plan for Immunization which endorsed HPV vaccination by Ministers of Health in the region and aided HPV vaccination in some countries; [4] Integration of HPV vaccination with existing school health programs where they exist e.g. vision screening, deworming, nutritional assessments, which occur in the right age group for HPV vaccination; [5] Engage multiple stakeholders which range from politicians, Departments of Education, Social Services, faith-based organisations, NPOs and representatives of the communities in which HPV vaccination programs are implemented; [6] Clear and appropriate messaging about HPV vaccination needs to be developed, be culturally sensitive and enabling for parents to make choices for their children.