Indigenous people's experiences of primary health care in Canada: a qualitative systematic review. / Expériences des Autochtones en matière de soins de santé primaires au Canada : revue systématique qualitative.

INTRODUCTION: Indigenous people in Canada encounter negative treatment when accessing primary health care (PHC). Despite several qualitative accounts of these experiences, there still has not been a qualitative review conducted on this topic. In this qualitative systematic review, we aimed to explore Indigenous people's experiences in Canada with PHC services, determine urban versus rural or remote differences and identify recommendations for quality improvement. METHODS: This review was guided by the Joanna Briggs Institute's methodology for systematic reviews of qualitative evidence. MEDLINE, CINAHL, PubMed, PsycInfo, Embase and Web of Science as well as grey literature and ancestry sources were used to identify relevant articles. Ancestry sources were obtained through reviewing the reference lists of all included articles and determining the ones that potentially met the eligibility criteria. Two independent reviewers conducted the initial and full text screening, data extraction and quality assessment. Once all data were gathered, they were synthesized following the meta-aggregation approach (PROSPERO CRD42020192353). RESULTS: The search yielded a total of 2503 articles from the academic databases and 12 articles from the grey literature and ancestry sources. Overall, 22 articles were included in this review. Three major synthesized findings were revealed-satisfactory experiences, discriminatory attitudes and systemic challenges faced by Indigenous patients-along with one synthesized finding on their specific recommendations. CONCLUSION: Indigenous people value safe, accessible and respectful care. The discrimination and racism they face negatively affect their overall health and well-being. Hence, it is crucial that changes in health care practice, structures and policy development as well as systemic transformation be implemented immediately.

Experiences of Indigenous peoples in Canada with primary health care services: a qualitative systematic review protocol.

OBJECTIVE: The objectives of this review are to aggregate and synthesize experiences of Indigenous peoples in Canada when receiving primary health care services; differentiate experiences from services provided in urban versus rural or remote settings; and identify recommendations to enhance quality of primary health care provision. INTRODUCTION: Primary health care plays a crucial role in overall population health and health equity. In Canada, Indigenous peoples continue to face disproportionate health disparities. Survey and qualitative studies on the experiences of Indigenous populations with primary health care services reveal alarming findings of inadequate health care access, racial discrimination, negligence, and cultural insensitivities. However, these studies do not entirely assess the primary care and essential public health functions component. This protocol will be the first qualitative systematic review to thoroughly synthesize Indigenous peoples' overall primary health care experiences across all Canada, in both rural and urban settings. INCLUSION CRITERIA: The population of interest is self-identified Indigenous peoples, who have first- and/or second-hand experience receiving primary health care services in Canada, regardless of their age, gender, or medical condition. Our focus is on patients' experiences in contexts where primary health care services are delivered in Canada. Only qualitative studies in English or French will be considered. METHODS: MEDLINE, CINAHL, PubMed, PsycINFO, Embase, and Web of Science will be used as information sources in addition to Google Scholar, Bielefeld Academic Search Engine, ProQuest Dissertations and Theses, and other relevant organization websites. Two independent reviewers will perform the screening, critical appraisal, and data extraction of selected articles. Results will then be synthesized using the meta-aggregation approach. SYSTEMATIC REVIEW REGISTRATION NUMBER: PROSPERO CRD42020192353.

Widespread expression of Sonic hedgehog (Shh) and Nrf2 in patients treated with cisplatin predicts outcome in resected tumors and are potential therapeutic targets for HPV-negative head and neck cancer.

BACKGROUND: Sonic hedgehog (Shh) and Nrf2 play a critical role in chemotherapeutic resistance. These two genes have been found to be dysregulated in head and neck squamous cell carcinomas (HNSCC). The purpose of this study was to analyze the expression, function and clinical prognostic relationship of Shh and Nrf2 in HNSCC in the context of therapeutic resistance and cancer stem cells (CSCs). METHODS: We analyzed a cohort of patients with HNSCC to identify potential therapeutic biomarkers correlating with overall survival (OS) as well as disease-free survival (DFS) from our own data and validated these results using The Cancer Genome Atlas dataset. Expression of Shh and Nrf2 was knocked down by siRNA and cell growth, sphere growth and chemotherapeutic resistance were evaluated. RESULTS: Widespread abundant expression of Shh and Nrf2 proteins were associated with shorter OS and DFS. The combination of Shh and Nrf2 expression levels was found to be a significant predictor of patient DFS. The tumor stromal index was correlated with Shh expression and inversely associated with shorter OS and DFS. Inhibition of Shh by siRNA or cyclopamine resulted in the attenuation of resistant CSC self-renewal, invasion, clonogenic growth and re-sensitization to the chemotherapeutic agents. Concomitant upregulation of Shh and Nrf2 proved to be an independent predictor of poor OS and DFS in patients with HNSCC. CONCLUSIONS: These findings suggest that Shh and Nrf2 could serve as therapeutic targets as well as promising dual prognostic therapeutic biomarkers for HNSCC.

Effect of the environment on genotypic diversity of Actinomyces naeslundii and Streptococcus oralis in the oral biofilm.

The genotypic diversity of Actinomyces naeslundii genospecies 2 (424 isolates) and Streptococcus oralis (446 isolates) strains isolated from two sound approximal sites in all subjects who were either caries active (seven subjects) or caries free (seven subjects) was investigated by using the repetitive extragenic palindromic PCR. The plaque from the caries-active subjects harbored significantly greater proportions of mutans streptococci and lactobacilli and a smaller proportion of A. naeslundii organisms than the plaque sampled from the caries-free subjects. These data confirmed that the sites of the two groups of subjects were subjected to different environmental stresses, probably determined by the prevailing or fluctuating acidic pH values. We tested the hypothesis that the microfloras of the sites subjected to greater stresses (the plaque samples from the caries-active subjects) would exhibit reduced genotypic diversity since the sites would be less favorable. We found that the diversity of A. naeslundii strains did not change (chi2 = 0.68; P = 0.41) although the proportional representation of A. naeslundii was significantly reduced (P < 0.05). Conversely, the diversity of the S. oralis strains increased (chi2 = 11.71; P = 0.0006) and the proportional representation of S. oralis did not change. We propose that under these environmental conditions the diversity and number of niches within the oral biofilm that could be exploited by S. oralis increased, resulting in the increased genotypic diversity of this species. Apparently, A. naeslundii was not able to exploit the new niches since the prevailing conditions within the niches may have been deleterious and not supportive of its proliferation. These results suggest that environmental stress may modify a biofilm such that the diversity of the niches is increased and that these niches may be successfully exploited by some, but not necessarily all, members of the microbial community.