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It is widely accepted that families are integral to biopsychosocial, social ecological, and other systemic approaches for understanding families and pediatric health. Pediatric psychologists are among the strongest advocates for families. At the same time, families pose challenges that we (pediatric psychology as a field) struggle with in terms of theoretical conceptualizations, assessment and intervention approaches, and training. We primarily use individual frameworks in our practice and research. In this brief commentary, prompted by the report of accomplishments in evidence-based family assessment in pediatric psychology (Alderfer et al., 2007), I outline some of the background for an implicit “challenge” to our field to advance our family orientation and provide some concrete ideas about next steps.
doi:10.1093/jpepsy/jsn061
PMCID: PMC2639488
Pain relief is a major goal for palliative care in India so much that most palliative care interventions necessarily begin first with pain relief. Physical therapists play an important role in palliative care and they are regarded as highly proficient members of a multidisciplinary healthcare team towards management of chronic pain. Pain necessarily involves three different levels of classification–based upon pain symptoms, pain mechanisms and pain syndromes. Mechanism-based treatments are most likely to succeed compared to symptomatic treatments or diagnosis-based treatments. The objective of this clinical commentary is to update the physical therapists working in palliative care, on the mechanism-based classification of pain and its interpretation, with available therapeutic evidence for providing optimal patient care using physical therapy. The paper describes the evolution of mechanism-based classification of pain, the five mechanisms (central sensitization, peripheral neuropathic, nociceptive, sympathetically maintained pain and cognitive-affective) are explained with recent evidence for physical therapy treatments for each of the mechanisms.
doi:10.4103/0973-1075.78458
PMCID: PMC3098553
PMID: 21633629
Mechanism-based classification; Pain rehabilitation; Pain sciences; Palliative physical therapy care
One of the least-appreciated advances in pediatric rheumatology over the past 25 years has been the delineation of the many ways in which children with rheumatic disease differ from adults with the same illnesses. Furthermore, we are now learning that paradigms that are useful in evaluating adults with musculoskeletal complaints have limited utility in children. Nowhere is that more true than in the use of commonly used laboratory tests, particularly antinuclear antibody (ANA) and rheumatoid factor (RF) assays. This short review will provide the practitioner with the evidence base that supports a more limited use of ANA and RF testing in children.
doi:10.1186/1546-0096-6-19
PMCID: PMC2588570
PMID: 19014701
The ideology of evidence-base medicine (EBM) has dramatically altered the way we think, conceptualize, philosophize and practice medicine. One of its major pillars is the appraisal and classification of evidence. Although important and beneficial, this process currently lacks detail and is in need of reform. In particular, it largely focuses on three key dimensions (design, [type I] alpha error and beta [type II] error) to grade the quality of evidence and often omits other crucial aspects of evidence such as biological plausibility, reproducibility, generalizability, temporality, consistency and coherence. It also over-values the randomized trial and meta-analytical techniques, discounts the biasing effect of single centre execution and gives insufficient weight to large and detailed observational studies. Unless these aspects are progressively included into systems for grading, evaluating and classifying evidence and duly empirically assessed (according to the EBM paradigm), the EBM process and movement will remain open to criticism of being more evidence-biased than evidence-based.
"All scientific work is incomplete – whether it be observational or experimental. All scientific work is liable to be upset or modified by advancing knowledge. That does not confer upon us a freedom to ignore the knowledge we already have, or to postpone the action that it appears to demand at a given time".
Sir Bradford Austin Hill [1]
doi:10.1186/1747-5341-3-23
PMCID: PMC2569956
PMID: 18826605
Lateral epicondylalgia or tennis elbow is a prevalent musculoskeletal disorder that is characterized by lateral elbow pain often associated with gripping tasks. The underlying pathology remains to be fully elucidated; however, evidence indicates that the disorder does not involve an inflammatory process but rather impairments of the pain and motor systems as well as morphological changes in the structure of both the extensor carpi radialis brevis muscle and tendon. Although the most efficient management approach remains controversial, there is a growing body of literature reporting the effects and underlying mechanisms of joint manipulation in the management of lateral epicondylalgia. Evidence exists demonstrating that joint manipulation directed at the elbow and wrist as well as at the cervical and thoracic spinal regions results in clinical alterations in pain and the motor system. In addition to presenting this evidence, this paper describes proposed underlying physiological mechanisms of joint manipulation associated with the observed clinical effects. We propose that this information will be useful for the physical therapist in making clinical decisions regarding the selection of treatment technique for the management of patients with lateral epicondylalgia.
PMCID: PMC2565595
PMID: 19066643
Tennis Elbow; Joint Mobilization; Joint Manipulation; Manual Therapy
Discussions about evidence-based medicine engender both negative and positive reactions from clinicians and academics. Ways to achieve evidence-based practice are reviewed here and the most common criticisms described. The latter can be classified as ”limitations universal to the practice of medicine,” ”limitations unique to evidence-based medicine” and ”misperceptions of evidence-based medicine.” Potential solutions to the true limitations of evidence-based medicine are discussed and areas for future work highlighted.
PMCID: PMC80509
PMID: 11033714
BACKGROUND: With increasing demand for health care, evidence-based medicine combined with health economics offers a method of optimizing allocation of limited resources. Depression is an illness that has a high prevalence with important medical, social and economic implications. More than 90% of depression is diagnosed and treated in general practice. AIM: To review the effectiveness of an evidence-based approach combined with health economics in deciding whether a tricyclic antidepressant (TCA) or a selective serotonin reuptake inhibitor (SSRI) should be used in the treatment of depression in general practice. METHOD: An evidence-based strategy tested the two treatments against the criteria of appropriateness, efficacy, effectiveness and value for money. RESULTS: Although both drugs were equally efficacious, their relative effectiveness and value for money could not be accurately defined. CONCLUSION: An evidence-based approach does not make clear whether SSRIs or TCAs should be used for the treatment of depression in general practice. Research questions arising from general practice should be addressed in a relevant setting and should yield answers that will complement and support a more pragmatic system of medicine rather than seek to direct it.
PMCID: PMC1312914
PMID: 9101693
Making decisions about medical treatments based upon valid evidence is critical to improve health-care quality, outcomes, and value. Although such research commonly connotes the use of randomized controlled trials, experimental methods are not always feasible, and research using observational, quasi-experimental, and other nonexperimental methods may also be important. At the same time, nonexperimental methods are inherently susceptible to various types of bias and thus present special challenges in the search for valid and generalizable evidence. The study by Gardarsdottir et al. (Am J Epidemiol. 2009;170(3):280–285), on which this commentary is based, addresses a key potential source of bias—mismeasurement of patients’ duration of treatment—in previous research on pharmacotherapy for depression. However, the authors’ study is unlikely to address other potential sources of bias, which may make interpretation of their findings more difficult.
doi:10.1093/aje/kwp137
PMCID: PMC2727173
PMID: 19498072
bias (epidemiology); depression; observation; research design; treatment outcome
This study was designed to understand patient perspectives on what patients value when oncologists communicate news of cancer recurrence. This study adds to the empirical evidence base about how oncologists should discuss news of cancer recurrence and identifies recognition, guidance, and responsiveness as patient-centered qualities of communication in this situation.
Learning Objectives
After completing this course, the reader will be able to:
Incorporate the three themes identified in this study to refine discussion with patients of their cancer recurrence.Manage discussion with patients of cancer recurrence with recognition of the impact of the news on the patient and guidance as to next steps.
This article is available for continuing medical education credit at CME.TheOncologist.com
Purpose.
Recommendations for communicating bad or serious news are based on limited evidence. This study was designed to understand patient perspectives on what patients value when oncologists communicate news of cancer recurrence.
Study Design and Methods.
Participants were 23 patients treated for a gastrointestinal cancer at a tertiary U.S. cancer center within the past 2 years, who had semistructured qualitative interviews in which they listened to audio recordings of an oncology fellow discussing news of cancer recurrence with a standardized patient. Participants paused the audio recording to comment on what they liked or disliked about the oncologist's communication.
Results.
Three themes were identified that refine existing approaches to discussing serious news. The first theme, recognition, described how the oncologist responded to the gravity of the news of cancer recurrence for the patient. Participants saw the need for recognition throughout the encounter and not just after the news was given. The second theme, guiding, describes what participants wanted after hearing the news, which was for the oncologist to draw on her biomedical expertise to frame the news and plan next steps. The third theme, responsiveness, referred to the oncologist's ability to sense the need for recognition or guidance and to move fluidly between them.
Conclusion.
This study suggests that oncologists giving news of cancer recurrence could think of the communication as going back and forth between recognition and guidance and could ask themselves: “Have I demonstrated that I recognize the patient's experience hearing the news?” and “Have I provided guidance to the next steps?”
doi:10.1634/theoncologist.2010-0274
PMCID: PMC3228111
PMID: 21349951
Communication; Medical ethics; Information-seeking behavior; Palliative care
Arsenic exposure affects millions of people worldwide, causing substantial mortality and morbidity from cancers and cardiovascular and respiratory diseases. An article in the current issue (Am J Epidemiol. 2013;177(3):202–212) reports that classic dermatological manifestations, typically associated with chronic arsenic exposure, are predictive of internal cancers among Taiwanese decades after the cessation of exposure. Specifically, the risk of lung and urothelial cancers was elevated, which was evident regardless of arsenic dose, smoking, and age. There was also an unexpected elevated risk of prostate cancer. Despite some methodological limitations, these findings underscore the need for assessing whether dermatological manifestations are also predictive of cardiovascular, respiratory, and other arsenic-related, long-term health consequences. Given the emerging evidence of arsenic exposure from dietary sources beyond contaminated drinking water and occupational and environmental settings, and also because the vast majority of diseases and deaths among exposed populations do not show classic dermatological manifestations, larger and more comprehensive investigations of the health effects of arsenic exposure, especially at lower doses, are needed. In parallel, because the risk of known arsenic-related health outcomes remains elevated decades after exposure cessation, research toward identification of early clinical and biological markers of long-term risk as well as avenues for prevention, in addition to policy actions for exposure reductions, is warranted.
doi:10.1093/aje/kws366
PMCID: PMC3555485
PMID: 23299696
arsenic; cancer; prevention; skin lesions
Background
Smokeless tobacco is an alternative for smokers who want to quit but require nicotine. Reliable evidence on its effects is needed. Boffetta et al. and ourselves recently reviewed the evidence on cancer, based on Scandinavian and US studies. Boffetta et al. claimed a significant 60–80% increase for oropharyngeal, oesophageal and pancreatic cancer, and a non-significant 20% increase for lung cancer, data for other cancers being "too sparse". We found increases less than 15% for oesophageal, pancreatic and lung cancer, and a significant 36% increase for oropharyngeal cancer, which disappeared in recent studies. We found no association with stomach, bladder and all cancers combined, using data as extensive as that for oesophageal, pancreatic and lung cancer. We explain these differences.
Methods
For those cancers Boffetta et al. considered, we compared the methods, studies and risk estimates used in the two reviews.
Results
One major reason for the difference is our more consistent approach in choosing between study-specific never smoker and combined smoker/non-smoker estimates. Another is our use of derived as well as published estimates. We included more studies, and avoided estimates for data subsets. Boffetta et al. also included some clearly biased or not smoking-adjusted estimates. For pancreatic cancer, their review included significantly increased never smoker estimates in one study and combined smoker/non-smoker estimates in another, omitting a combined estimate in the first study and a never smoker estimate in the second showing no increase. For oesophageal cancer, never smoker results from one study showing a marked increase for squamous cell carcinoma were included, but corresponding results for adenocarcinoma and combined smoker/non-smoker results for both cell types showing no increase were excluded. For oropharyngeal cancer, Boffetta et al. included a markedly elevated estimate that was not smoking-adjusted, and overlooked the lack of association in recent studies.
Conclusion
When conducting meta-analyses, all relevant data should be used, with clear rules governing the choice between alternative estimates. A systematic meta-analysis using pre-defined procedures and all relevant data gives a lower estimate of cancer risk from smokeless tobacco (probably 1–2% of that from smoking) than does the previous review by Boffetta et al.
doi:10.1186/1471-2407-9-256
PMCID: PMC3087330
PMID: 19638246
This commentary presents the view of an Expert Group of Indian nephrologists on adaptation and implementation of the Kidney Disease: Improving Global Outcomes (KDIGO) guidelines for evaluation and management of mineral and bone disorder in chronic kidney disease (CKD-MBD) for practice in India. Zonal meetings of nephrologists drawn from the cross-section were convened to discuss the KDIGO guidelines. Recommendations were presented in a central meeting of zonal representatives. The finalized recommendations were reviewed by all the participants. There was a broad agreement on most of the recommendations made by the KDIGO workgroup. Significant departures in the current guidelines from the previous Kidney Disease Outcome Quality Initiative (KDOQI) guidelines were also noted. The participants agreed that the available evidence did not allow more precise recommendations, and the recommended best practice suggestions were often based on relatively weak evidence. There is a remarkable lack of data from Indian patients. We comment on specific areas and amplify certain concepts where we feel that further guidance that goes beyond what is stated in the document might help Indian nephrologists in appropriate implementation of the KDIGO guidelines. This commentary is intended to help define practically implementable best practices based on current disease concepts and available research evidence, thereby positively affecting the quality of management of CKD-MBD in India, and eventually improving patient outcomes.
doi:10.4103/0971-4065.83930
PMCID: PMC3161429
PMID: 21886971
Chronic kidney disease; guideline; hyperparathyroidism; KDIGO; mineral and bone disorder
A meta-analytic review of the Triple P-Positive Parenting program by Wilson et al., recently published in BMC Medicine, claimed to demonstrate that although Triple P is widely disseminated and adopted, the evidence attesting to the effectiveness of the program is not as convincing as it may appear. Although this review addresses the important issue of evaluation and reporting methods within evidence-based interventions, we contend that the Wilson et al. review contains a number of significant conceptual, methodological and interpretational inadequacies that render the key conclusions of their review problematic.
doi:10.1186/1741-7015-10-145
PMCID: PMC3532235
PMID: 23173559
Triple P; Public Health; Parenting; Evidence
An article by Jerome Puskin attempts to justify the continued use of the linear no-threshold (LNT) assumption in radiation protection and risk assessment. In view of the substantial and increasing amount of data that contradicts this assumption; it is difficult to understand the reason for endorsing this unscientific behavior, which severely constrains nuclear energy projects and the use of CT scans in medicine. Many Japanese studies over the past 25 years have shown that low doses and low dose rates of radiation improve health in living organisms including humans. Recent studies on fruit flies have demonstrated that the original basis for the LNT notion is invalid. The Puskin article omits any mention of important reports from UNSCEAR, the NCRP and the French Academies of Science and Medicine, while citing an assessment of the Canadian breast cancer study that manipulated the data to obscure evidence of reduced breast cancer mortality following a low total dose. This commentary provides dose limits that are based on real human data, for both single and chronic radiation exposures.
doi:10.2203/dose-response.10-003.Cuttler
PMCID: PMC2939692
PMID: 20877492
While chronic exposure to secondhand smoke has been well recognized as a cause of heart disease in nonsmokers, there has been recent speculation about the potential acute cardiovascular effects of transient exposure to secondhand smoke among nonsmokers; in particular, the possibility that such exposure could increase the risk of acute myocardial infarction even in an otherwise healthy nonsmoker. This paper reviews the claims being made by a number of anti-smoking and public health groups regarding the acute cardiovascular effects of secondhand smoke exposure among otherwise healthy adults, analyzes the validity of these claims based on a review of the scientific evidence, and discusses the implications of the findings for tobacco control and public health practice. Based on the analysis, it appears that a large number of anti-smoking organizations are making inaccurate claims that a single, acute, transient exposure to secondhand smoke can cause severe and even fatal cardiovascular events in healthy nonsmokers. The dissemination of inaccurate information by anti-smoking groups to the public in support of smoking bans is unfortunate because it may harm the tobacco control movement by undermining its credibility, reputation, and effectiveness. Disseminating inaccurate information also represents a violation of basic ethical principles that are a core value of public health practice that cannot and should not be sacrificed, even for a noble end such as protecting nonsmokers from secondhand smoke exposure. How the tobacco control movement responds to this crisis of credibility will go a long way towards determining the future effectiveness of the movement and its ability to continue to save lives and protect the public's health.
doi:10.1186/1742-5573-4-12
PMCID: PMC2100052
PMID: 17927828
Genome-wide linkage analysis studies in families with systemic lupus erythematosus (SLE) have revealed consistent evidence of linkage to several regions of the genome. In a previous issue of this journal, Graham and colleagues described their approach to following up the linkage data for one of these regions, 1q41–42. Using methods based on the transmission disequilibrium test, the region likely to harbour a SLE disease gene was refined to 2.3 Mb. This commentary discusses their approach and identifies lessons that may be applicable to the investigation of other complex diseases.
doi:10.1186/ar394
PMCID: PMC128919
PMID: 11879543
association; linkage; systemic lupus erythematosus; transmission disequilibrium test; whole-genome scan
There has been considerable investigation of the potential for soyfoods to reduce risk of cancer, and in particular cancer of the breast. Most interest in this relationship is because soyfoods are essentially a unique dietary source of isoflavones, compounds which bind to estrogen receptors and exhibit weak estrogen-like effects under certain experimental conditions. In recent years the relationship between soyfoods and breast cancer has become controversial because of concerns – based mostly on in vitro and rodent data – that isoflavones may stimulate the growth of existing estrogen-sensitive breast tumors. This controversy carries considerable public health significance because of the increasing popularity of soyfoods and the commercial availability of isoflavone supplements. In this analysis and commentary we attempt to outline current concerns regarding the estrogen-like effects of isoflavones in the breast focusing primarily on the clinical trial data and place these concerns in the context of recent evidence regarding estrogen therapy use in postmenopausal women. Overall, there is little clinical evidence to suggest that isoflavones will increase breast cancer risk in healthy women or worsen the prognosis of breast cancer patients. Although relatively limited research has been conducted, and the clinical trials often involved small numbers of subjects, there is no evidence that isoflavone intake increases breast tissue density in pre- or postmenopausal women or increases breast cell proliferation in postmenopausal women with or without a history of breast cancer. The epidemiologic data are generally consistent with the clinical data, showing no indication of increased risk. Furthermore, these clinical and epidemiologic data are consistent with what appears to be a low overall breast cancer risk associated with pharmacologic unopposed estrogen exposure in postmenopausal women. While more research is required to definitively allay concerns, the existing data should provide some degree of assurance that isoflavone exposure at levels consistent with historical Asian soyfood intake does not result in adverse stimulatory effects on breast tissue.
doi:10.1186/1475-2891-7-17
PMCID: PMC2443803
PMID: 18522734
Blum, Kenneth | Chen, Amanda Lih Chuan | Chen, Thomas JH | Braverman, Eric R | Reinking, Jeffrey | Blum, Seth H | Cassel, Kimberly | Downs, Bernard W | Waite, Roger L | Williams, Lonna | Prihoda, Thomas J | Kerner, Mallory M | Palomo, Tomas | Comings, David E | Tung, Howard | Rhoades, Patrick | Oscar-Berman, Marlene
Background and hypothesis
Based on neurochemical and genetic evidence, we suggest that both prevention and treatment of multiple addictions, such as dependence to alcohol, nicotine and glucose, should involve a biphasic approach. Thus, acute treatment should consist of preferential blocking of postsynaptic Nucleus Accumbens (NAc) dopamine receptors (D1-D5), whereas long term activation of the mesolimbic dopaminergic system should involve activation and/or release of Dopamine (DA) at the NAc site. Failure to do so will result in abnormal mood, behavior and potential suicide ideation. Individuals possessing a paucity of serotonergic and/or dopaminergic receptors, and an increased rate of synaptic DA catabolism due to high catabolic genotype of the COMT gene, are predisposed to self-medicating any substance or behavior that will activate DA release, including alcohol, opiates, psychostimulants, nicotine, gambling, sex, and even excessive internet gaming. Acute utilization of these substances and/or stimulatory behaviors induces a feeling of well being. Unfortunately, sustained and prolonged abuse leads to a toxic" pseudo feeling" of well being resulting in tolerance and disease or discomfort. Thus, a reduced number of DA receptors, due to carrying the DRD2 A1 allelic genotype, results in excessive craving behavior; whereas a normal or sufficient amount of DA receptors results in low craving behavior. In terms of preventing substance abuse, one goal would be to induce a proliferation of DA D2 receptors in genetically prone individuals. While in vivo experiments using a typical D2 receptor agonist induce down regulation, experiments in vitro have shown that constant stimulation of the DA receptor system via a known D2 agonist results in significant proliferation of D2 receptors in spite of genetic antecedents. In essence, D2 receptor stimulation signals negative feedback mechanisms in the mesolimbic system to induce mRNA expression causing proliferation of D2 receptors.
Proposal and conclusion
The authors propose that D2 receptor stimulation can be accomplished via the use of Synapatmine™, a natural but therapeutic nutraceutical formulation that potentially induces DA release, causing the same induction of D2-directed mRNA and thus proliferation of D2 receptors in the human. This proliferation of D2 receptors in turn will induce the attenuation of craving behavior. In fact as mentioned earlier, this model has been proven in research showing DNA-directed compensatory overexpression (a form of gene therapy) of the DRD2 receptors, resulting in a significant reduction in alcohol craving behavior in alcohol preferring rodents. Utilizing natural dopaminergic repletion therapy to promote long term dopaminergic activation will ultimately lead to a common, safe and effective modality to treat Reward Deficiency Syndrome (RDS) behaviors including Substance Use Disorders (SUD), Attention Deficit Hyperactivity Disorder (ADHD), Obesity and other reward deficient aberrant behaviors. This concept is further supported by the more comprehensive understanding of the role of dopamine in the NAc as a "wanting" messenger in the meso-limbic DA system.
doi:10.1186/1742-4682-5-24
PMCID: PMC2615745
PMID: 19014506
Objective: To describe the history and methods of the National Collegiate Athletic Association (NCAA) Injury Surveillance System (ISS) as a complement to the sport-specific chapters that follow.
Background: The NCAA has maintained the ISS for intercollegiate athletics since 1982. The primary goal of the ISS is to collect injury and exposure data from a representative sample of NCAA institutions in a variety of sports. Relevant data are then shared with the appropriate NCAA sport and policy committees to provide a foundation for evidence-based decision making with regard to health and safety issues.
Description: The ISS monitors formal team activities, numbers of participants, and associated time-loss athletic injuries from the first day of formal preseason practice to the final postseason contest for 16 collegiate sports. In this special issue of the
Journal of Athletic Training, injury information in 15 collegiate sports from the period covering 1988–1989 to 2003–2004 is evaluated.
Conclusions: Athletic trainers and the NCAA have collaborated for 25 years through the NCAA ISS to create the largest ongoing collegiate sports injury database in the world. Data collection through the ISS, followed by annual review via the NCAA sport rules and sports medicine committee structure, is a unique mechanism that has led to significant advances in health and safety policy within and beyond college athletics. The publication of this special issue and the evolution of an expanded Web-based ISS enhance the opportunity to apply the health and safety decision-making process at the level of the individual athletic trainer and institution.
PMCID: PMC1941300
athletics; sports; exposures; athletic injuries; injury mechanisms; injury rates; injury surveillance; practices; games
Two commentaries in this issue, one by Torgesen and one by Fuchs and Fuchs, are largely supportive of our views of the value of implementing response to intervention (RTI) models in schools. In contrast, Reynolds and Shaywitz’s criticisms of RTI represent traditional and often nonempirical views of learning disabilities (LDs). The evidence base on RTI is not empty, and Reynolds and Shaywitz fail to provide research support for their views of either LDs or RTI.
doi:10.1111/j.1750-8606.2008.00076.x
PMCID: PMC3032407
PMID: 21297887
Sarah Bowen and Sara Kreindler argue that indicators can be valuable, but are also often flawed. They suggest that performance indicators should at best serve as a flag for policy makers but should not drive decisions. We would argue that there is growing evidence of the positive impact of performance indicators. When performance indicators are selected based on sound strategies – and used as part of a clear performance management cycle that balances policy instruments (e.g., accountability agreements) and performance improvement processes (e.g., process redesign) – they can drive valuable performance improvements and help align strategies across all health system partners.
PMCID: PMC2645161
PMID: 19377326
While there are an abundance of pediatric neuropsychologists working with youth with epilepsy (YWE), other subspecialty psychologists have played minimal roles in clinical and research endeavors in pediatric epilepsy. Thus, the purpose of this commentary was to describe (a) the needs of YWE due to the intermittent nature of seizures and difficulties with disease management, (b) increased risk for psychosocial comorbidities, (c) limited access to care, and (d) provide recommendations for how pediatric psychologists can become involved in the clinical care and research activities for YWE.
doi:10.1093/jpepsy/jsq109
PMCID: PMC3079127
PMID: 21148174
The 4th edition of the World Health Organization classification of tumors of hematopoietic and lymphoid tissues introduces many new items to the classification scheme of the so-called indolent B cell lymphomas. New proposed entities, such as splenic B cell lymphoma/leukemia, unclassifiable, splenic diffuse red pulp small B cell lymphoma, hairy cell leukemia variant, pediatric follicular lymphoma, and pediatric marginal zone lymphoma have been coined, and some definitions of established diseases, such as chronic lymphocytic leukemia or Waldenström’s macroglobulinemia have been revised. One aspect of major importance is the recent description of small clonal B cell populations, in part with a CLL phenotype, and their relationship to B-CLL. Some new subtypes or variants of follicular lymphoma with distinct clinicopathologic and/or molecular genetic characteristics have been described, including primary follicular lymphomas of the duodenum and pediatric follicular lymphomas. Furthermore, the impact of some probably early, or precursor lesions, such as follicular lymphoma in situ is discussed. Overall, we succinctly discuss the essential elements of the revisions made in the updated classification, and we identify potential opportunities for refinement of new or provisional categories in subsequent classifications.
doi:10.1007/s12308-009-0037-9
PMCID: PMC2725287
PMID: 19669189
WHO classification; Malignant lymphoma; Indolent; Commentary; Low grade
The 4th edition of the World Health Organization classification of tumors of hematopoietic and lymphoid tissues introduces many new items to the classification scheme of the so-called indolent B cell lymphomas. New proposed entities, such as splenic B cell lymphoma/leukemia, unclassifiable, splenic diffuse red pulp small B cell lymphoma, hairy cell leukemia variant, pediatric follicular lymphoma, and pediatric marginal zone lymphoma have been coined, and some definitions of established diseases, such as chronic lymphocytic leukemia or Waldenström’s macroglobulinemia have been revised. One aspect of major importance is the recent description of small clonal B cell populations, in part with a CLL phenotype, and their relationship to B-CLL. Some new subtypes or variants of follicular lymphoma with distinct clinicopathologic and/or molecular genetic characteristics have been described, including primary follicular lymphomas of the duodenum and pediatric follicular lymphomas. Furthermore, the impact of some probably early, or precursor lesions, such as follicular lymphoma in situ is discussed. Overall, we succinctly discuss the essential elements of the revisions made in the updated classification, and we identify potential opportunities for refinement of new or provisional categories in subsequent classifications.
doi:10.1007/s12308-009-0037-9
PMCID: PMC2725287
PMID: 19669189
WHO classification; Malignant lymphoma; Indolent; Commentary; Low grade
This commentary on ideas about neural mechanisms underlying pain is aimed at providing perspective for a reader who does not work in the field of mammalian somatic sensation. It is not a comprehensive review of the literature. The organization is historical to chronicle the evolution of ideas. The aim is to call attention to source of concepts and how various ideas have fared over time.
One difficulty in relating concepts about pain is that the term is used to refer to human and animal reactions ranging from protective spinal reflexes to complex affective behaviors. As a result, the spectrum of “pain”-related neural organization extends to operation of multiple neuronal arrangements.
Thinking about pain has shadowed progress in understanding biological mechanisms, in particular the manner of function of nervous systems. This essay concentrates on the evolution of information and concepts from the early 19th century to the present. Topics include the assumptions underlying currently active theories about pain mechanisms. At the end, brief consideration is given to present-day issues, e.g., chronic pain, central pain, and the view of pain as an emotion rather than a sensation. The conceptual progression shows that current controversies have old roots and that failed percepts often resurface after seemingly having been put to rest by argument and evidence.
doi:10.1016/j.pneurobio.2011.03.001
PMCID: PMC3138063
PMID: 21419824