A Per-Protocol Analysis Using Inverse-Probability-of-Censoring Weights in a Randomized Trial of Initial Protease Inhibitor Versus Nonnucleoside Reverse Transcriptase Inhibitor Regimens in Children.

Protocol adherence may influence measured treatment effectiveness in randomized controlled trials. Using data from a multicenter trial (Europe and the Americas, 2002-2009) of children with human immunodeficiency virus type 1 who had been randomized to receive initial protease inhibitor (PI) versus nonnucleoside reverse transcriptase inhibitor (NNRTI) antiretroviral therapy regimens, we generated time-to-event intention-to-treat (ITT) estimates of treatment effectiveness, applied inverse-probability-of-censoring weights to generate per-protocol efficacy estimates, and compared shifts from ITT to per-protocol estimates across and within treatment arms. In ITT analyses, 263 participants experienced 4-year treatment failure probabilities of 41.3% for PIs and 39.5% for NNRTIs (risk difference = 1.8% (95% confidence interval (CI): -10.1, 13.7); hazard ratio = 1.09 (95% CI: 0.74, 1.60)). In per-protocol analyses, failure probabilities were 35.6% for PIs and 29.2% for NNRTIs (risk difference = 6.4% (95% CI: -6.7, 19.4); hazard ratio = 1.30 (95% CI: 0.80, 2.12)). Within-arm shifts in failure probabilities from ITT to per-protocol analyses were 5.7% for PIs and 10.3% for NNRTIs. Protocol nonadherence was nondifferential across arms, suggesting that possibly better NNRTI efficacy may have been masked by differences in within-arm shifts deriving from differential regimen forgiveness, residual confounding, or chance. A per-protocol approach using inverse-probability-of-censoring weights facilitated evaluation of relationships among adherence, efficacy, and forgiveness applicable to pediatric oral antiretroviral regimens.

Frequent Development of Broadly Neutralizing Antibodies in Early Life in a Large Cohort of Children With Human Immunodeficiency Virus.

BACKGROUND: Recent studies have indicated that broadly neutralizing antibodies (bnAbs) in children may develop earlier after human immunodeficiency virus (HIV) infection compared to adults. METHODS: We evaluated plasma from 212 antiretroviral therapy-naive children with HIV (1-3 years old). Neutralization breadth and potency was assessed using a panel of 10 viruses and compared to adults with chronic HIV. The magnitude, epitope specificity, and immunoglobulin (Ig)G subclass distribution of Env-specific antibodies were assessed using a binding antibody multiplex assay. RESULTS: One-year-old children demonstrated neutralization breadth comparable to chronically infected adults, whereas 2- and 3-year-olds exhibited significantly greater neutralization breadth (P = .014). Likewise, binding antibody responses increased with age, with levels in 2- and 3-year-old children comparable to adults. Overall, there was no significant difference in antibody specificities or IgG subclass distribution between the pediatric and adult cohorts. It is interesting to note that the neutralization activity was mapped to a single epitope (CD4 binding site, V2 or V3 glycans) in only 5 of 38 pediatric broadly neutralizing samples, which suggests that most children may develop a polyclonal neutralization response. CONCLUSIONS: These results contribute to a growing body of evidence suggesting that initiating HIV immunization early in life may present advantages for the development of broadly neutralizing antibody responses.

The genetic architecture of larval aggregation behavior in Drosophila.

Many insect species exhibit basal social behaviors such as aggregation, which play important roles in their feeding and mating ecologies. However, the evolutionary, genetic, and physiological mechanisms that regulate insect aggregation remain unknown for most species. Here, we used natural populations of Drosophila melanogaster to identify the genetic architecture that drives larval aggregation feeding behavior. By using quantitative and reverse genetic approaches, we have identified a complex neurogenetic network that plays a role in regulating the decision of larvae to feed in either solitude or as a group. Results from single gene, RNAi-knockdown experiments show that several of the identified genes represent key nodes in the genetic network that determines the level of aggregation while feeding. Furthermore, we show that a single non-coding variant in the gene CG14205, a putative acyltransferase, is associated with both decreased mRNA expression and increased aggregate formation, which suggests that it has a specific role in inhibiting aggregation behavior. Our results identify, for the first time, the genetic components which interact to regulate naturally occurring levels of aggregation in D. melanogaster larvae.

"It's Almost Like Gay Sex Doesn't Exist:" Parent-Child Sex Communication According to Gay, Bisexual, and Queer Adolescent Sons.

Sex communication interventions facilitate positive sexual health outcomes with heterosexual adolescents. The same has yet to be established for male youth with same-sex attractions, behaviors, and identities. Our study describes the experiences of gay, bisexual and queer-identifying adolescent males with parent-child sex communication. We conducted 30 in-depth semi-structured interviews with a diverse group of 15 to 20 year-old gay, bisexual, and queer (GBQ) males. Interview transcripts were coded and themes were identified using thematic and content analysis. Narratives revealed that sex communication with parents occurs rarely, is heteronormative in content prior to adolescent males' disclosure as GBQ, and after disclosure is reactionary and based on stereotypes that associate this population with negative health outcomes. Parents were rated poorly as sex educators by adolescent males and the findings are mixed regarding perception of parents' knowledge about GBQ-specific information. Parents and healthcare providers were identified as preferred sources of sex information by GBQ adolescent males. Sex communication with parents throughout adolescence that excludes GBQ males' same-sex concerns is a missed opportunity for targeted sexual risk reduction. There are multiple ways healthcare providers can assist parents to plan age-appropriate, sexuality-inclusive, home-based discussions about sex for this group.

The Drosophila Postsynaptic DEG/ENaC Channel ppk29 Contributes to Excitatory Neurotransmission.

The protein family of degenerin/epithelial sodium channels (DEG/ENaCs) is composed of diverse animal-specific, non-voltage-gated ion channels that play important roles in regulating cationic gradients across epithelial barriers. Some family members are also enriched in neural tissues in both vertebrates and invertebrates. However, the specific neurophysiological functions of most DEG/ENaC-encoding genes remain poorly understood. The fruit fly Drosophila melanogaster is an excellent model for deciphering the functions of DEG/ENaC genes because its genome encodes an exceptionally large number of DEG/ENaC subunits termed pickpocket (ppk) 1-31 Here we demonstrate that ppk29 contributes specifically to the postsynaptic modulation of excitatory synaptic transmission at the larval neuromuscular junction. Electrophysiological data indicate that the function of ppk29 in muscle is necessary for normal postsynaptic responsivity to neurotransmitter release and for normal coordinated larval movement. The ppk29 mutation does not affect gross synaptic morphology and ultrastructure, which indicates that the observed phenotypes are likely due to defects in glutamate receptor function. Together, our data indicate that DEG/ENaC ion channels play a fundamental role in the postsynaptic regulation of excitatory neurotransmission.SIGNIFICANCE STATEMENT Members of the degenerin/epithelial sodium channel (DEG/ENaC) family are broadly expressed in epithelial and neuronal tissues. To date, the neurophysiological functions of most family members remain unknown. Here, by using the power of Drosophila genetics in combination with electrophysiological and behavioral approaches, we demonstrate that the DEG/ENaC-encoding gene pickpocket 29 contributes to baseline neurotransmission, possibly via the modulation of postsynaptic glutamate receptor functionality.

Obtaining waivers of parental consent: A strategy endorsed by gay, bisexual, and queer adolescent males for health prevention research.

BACKGROUND: Requiring parental consent in studies with sexual minority youth (SMY) can sometimes be problematic as participants may have yet to disclose their sexual orientation, may not feel comfortable asking parents' permission, and may promote a self-selection bias. PURPOSE: We discuss rationale for waiving parental consent, strategies to secure waivers from review boards, and present participants' feedback on research without parents' permission. METHODS: We share our institutional review board proposal in which we made a case that excluding SMY from research violates ethical research principles, does not recognize their autonomy, and limits collection of sexuality data. DISCUSSION: Standard consent policies may inadvertently exclude youth who are at high risk for negative health outcomes or may potentially put them at risk because of forced disclosure of sexual orientation. Securing a waiver addresses these concerns and allows for rich data, which is critical for providers to have a deeper understanding of their unique sexual health needs. CONCLUSION: To properly safeguard and encourage research informed by SMY, parental consent waivers may be necessary.

Use of altered informed consent in pragmatic clinical research.

There are situations in which the requirement to obtain conventional written informed consent can impose significant or even insurmountable barriers to conducting pragmatic clinical research, including some comparative effectiveness studies and cluster-randomized trials. Although certain federal regulations governing research in the United States (45 CFR 46) define circumstances in which any of the required elements may be waived, the same standards apply regardless of whether any single element is to be waived or whether consent is to be waived in its entirety. Using the same threshold for a partial or complete waiver limits the options available to institutional review boards as they seek to optimize a consent process. In this article, we argue that new standards are necessary in order to enable important pragmatic clinical research while at the same time protecting patients' rights and interests.

Ethical considerations in design of a study to evaluate a US Food and Drug Administration-approved indication: antivenom versus placebo for copperhead envenomation.

BACKGROUND: In 2000, the US Food and Drug Administration approved CroFab(®) Crotalidae Polyvalent Immune Fab, ovine (FabAV), which had received orphan drug designation, for use in patients with minimal to moderate North American crotaline envenomations including copperhead snakes. As existing evidence on the effectiveness of FabAV for this indication is limited, wide practice variation in its use exists. In order to provide more definitive clinical evidence as to the role of this treatment, a new randomized, placebo-controlled trial of FabAV specifically for copperhead bites was initiated. PURPOSE: In light of the existing US Food and Drug Administration approval, ethical considerations of participation in this trial have been raised. We discuss the ethical principles pertinent to this randomized, placebo-controlled trial with placebo arm. We apply an accepted framework for ethical research to this trial. Due to the evidence gap in the literature, wide-ranging treatment recommendations by medical experts, and broad practice variation, clinical equipoise exists in the treatment of copperhead envenomation with FabAV. The impact of this clinical equipoise on the value and scientific validity of the trial is discussed. The trial's risk-benefit ratio is also considered. Potential risks to the patients are minimized as the protocol includes a plan for rescue therapy in the event that patients progress to severe envenomation symptoms. Overall, risks are further minimized by the inclusion of an interim analysis with stopping rules based on demonstrated efficacy should the therapy clearly prove to be beneficial. CONCLUSION: Although a post-marketing clinical study of this nature is unusual for an approved indication, this trial adheres to all ethical preconditions found in existing guidelines for clinical research involving human subjects.

Systematic review and metasummary of attitudes toward research in emergency medical conditions.

Emergency departments are challenging research settings, where truly informed consent can be difficult to obtain. A deeper understanding of emergency medical patients' opinions about research is needed. We conducted a systematic review and meta-summary of quantitative and qualitative studies on which values, attitudes, or beliefs of emergent medical research participants influence research participation. We included studies of adults that investigated opinions toward emergency medicine research participation. We excluded studies focused on the association between demographics or consent document features and participation and those focused on non-emergency research. In August 2011, we searched the following databases: MEDLINE, EMBASE, Google Scholar, Scirus, PsycINFO, AgeLine and Global Health. Titles, abstracts and then full manuscripts were independently evaluated by two reviewers. Disagreements were resolved by consensus and adjudicated by a third author. Studies were evaluated for bias using standardised scores. We report themes associated with participation or refusal. Our initial search produced over 1800 articles. A total of 44 articles were extracted for full-manuscript analysis, and 14 were retained based on our eligibility criteria. Among factors favouring participation, altruism and personal health benefit had the highest frequency. Mistrust of researchers, feeling like a 'guinea pig' and risk were leading factors favouring refusal. Many studies noted limitations of informed consent processes in emergent conditions. We conclude that highlighting the benefits to the participant and society, mitigating risk and increasing public trust may increase research participation in emergency medical research. New methods for conducting informed consent in such studies are needed.

Sports medicine and ethics.

Physicians working in the world of competitive sports face unique ethical challenges, many of which center around conflicts of interest. Team-employed physicians have obligations to act in the club's best interest while caring for the individual athlete. As such, they must balance issues like protecting versus sharing health information, as well as issues regarding autonomous informed consent versus paternalistic decision making in determining whether an athlete may compete safely. Moreover, the physician has to deal with an athlete's decisions about performance enhancement and return to play, pursuit of which may not be in the athlete's long-term best interests but may benefit the athlete and team in the short term. These difficult tasks are complicated by the lack of evidence-based standards in a field influenced by the lure of financial gains for multiple parties involved. In this article, we review ethical issues in sports medicine with specific attention paid to American professional football.

MD-PhD Program Graduates' Engagement in Research: Results of a National Study.

PURPOSE: To determine if specialty, among other professional development and demographic variables, predicted MD-PhD program graduates' research engagement. METHOD: The authors merged the 2015 Association of American Medical Colleges (AAMC) National MD-PhD Program Outcomes Survey database with selected data from the AAMC Student Records System, Graduation Questionnaire, and Graduate Medical Education (GME) Track Resident Survey. At the person level, they tested variables of interest for independent associations with MD-PhD graduates' research engagement using chi-square, Pearson correlations, and analysis of variance tests and logistic and linear regressions. RESULTS: Of 3,297 MD-PhD graduates from 1991-2010 who were no longer in GME training in 2015, 78.0% (2,572/3,297) reported research engagement. In models controlling for several variables, a neurology (vs internal medicine; adjusted odds ratio [AOR]: 2.48; 95% confidence interval [CI]: 1.60-3.86) or pathology (vs internal medicine; AOR: 1.89; 95% CI: 1.33-2.68) specialty, full-time faculty/research scientist career intention at graduation (vs all other career intentions; AOR: 3.04; 95% CI: 2.16-4.28), and ≥ 1 year of GME research (vs no GME research year[s]; AOR: 2.45; 95% CI: 1.96-3.06) predicted a greater likelihood of research engagement. Among graduates engaged in research, the mean percentage of research time was 49.9% (standard deviation 30.1%). Participation in ≥ 1 year of GME research (beta [ß] coefficient: 7.99, P < .001) predicted a higher percentage of research time, whereas a radiation oncology (ß: -28.70), diagnostic radiology (ß: -32.92), or surgery (ß: -29.61) specialty, among others, predicted a lower percentage of research time (each P < .001 vs internal medicine). CONCLUSIONS: Most MD-PhD graduates were engaged in research, but the extent of their engagement varied substantially among specialties. Across specialties, participation in research during GME may be one factor that sustains MD-PhD graduates' subsequent early- to midcareer research engagement.