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BIOSTATISTICS
Intention-to-treat concept: A review
Sandeep K Gupta
July-September 2011, 2(3):109-112
DOI
:10.4103/2229-3485.83221
PMID
:21897887
Randomized controlled trials often suffer from two major complications, i.e., noncompliance and missing outcomes. One potential solution to this problem is a statistical concept called intention-to-treat (ITT) analysis. ITT analysis includes every subject who is randomized according to randomized treatment assignment. It ignores noncompliance, protocol deviations, withdrawal, and anything that happens after randomization. ITT analysis maintains prognostic balance generated from the original random treatment allocation. In ITT analysis, estimate of treatment effect is generally conservative. A better application of the ITT approach is possible if complete outcome data are available for all randomized subjects. Per-protocol population is defined as a subset of the ITT population who completed the study without any major protocol violations.
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RESEARCH METHODOLOGY
Patient-reported outcomes: A new era in clinical research
Prasanna R Deshpande, Surulivel Rajan, B Lakshmi Sudeepthi, CP Abdul Nazir
October-December 2011, 2(4):137-144
DOI
:10.4103/2229-3485.86879
Now-a-days there is significant discussion about patient-reported outcomes (PRO) in medical world. The following article covers almost all the areas of PRO including-their importance, important concepts for understanding of PRO, significance, ideal properties, types, development and evaluation of PRO instruments. It is useful for physicians, pharmacists and patients for the assessment and improvement of the therapy.
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REVIEW ARTICLES
MicroRNA therapeutics: Discovering novel targets and developing specific therapy
Ajay Francis Christopher, Raman Preet Kaur, Gunpreet Kaur, Amandeep Kaur, Vikas Gupta, Parveen Bansal
April-June 2016, 7(2):68-74
DOI
:10.4103/2229-3485.179431
PMID
:27141472
MicroRNAs (miRNAs) are small non-coding RNA molecules that regulate gene expression in diverse biological process. They act as intracellular mediators that are necessary for various biological processes. MicroRNAs targeting pathways of human disease provide a new and potential powerful candidate for therapeutic intervention against various pathological conditions. Even though, the information about miRNA biology has significantly enriched but we still do not completely understand the mechanism of miRNA gene regulation. Various groups across the globe and pharmaceutical companies are conducting research and developments to explore miRNA based therapy and build a whole new area of miroRNA therapeutics. Consequently, few miRNAs have entered the preclinical and clinical stage and soon might be available in the market for use in humans.
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Elderly patients' participation in clinical trials
Premnath Shenoy, Anand Harugeri
October-December 2015, 6(4):184-189
DOI
:10.4103/2229-3485.167099
PMID
:26623388
The elderly population is a large and the fastest-growing portion of the population worldwide. The elderly make up the lion's share of patients for certain health conditions including cancer, cardiovascular disease, arthritis, and Parkinson's disease, among others in most parts of the world. Furthermore, elderly make up the majority of patients for many medications treating chronic conditions. Typically, clinical trials conducted in adult population include patients between the ages of 18 and 64 years. However, drugs should be studied in all age groups and trial participants should be representative of the patient population receiving the therapy in daily medical practice. Elderly patients are poorly represented in clinical trials. Hence, there is inadequate evidence and knowledge about responses of geriatric patients to medications. Regulatory authorities in developed countries urge to avoid arbitrary upper age limits and advise researchers and industry not to exclude elderly people from clinical trials without a valid reason. Since last few years Indian regulatory authority has been stipulating upper age limit for studies conducted in India. The Central Drugs Standard Control Organization (CDSCO) will be doing a great contribution to the researchers if it changes its view on stipulating upper age restrictions in clinical studies. This article describes the need for including elderly patients in the clinical trials in order to garner data from geriatric patients who form major medication users in most of the chronic diseases.
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STATISTICS
Common pitfalls in statistical analysis: Intention-to-treat versus per-protocol analysis
Priya Ranganathan, CS Pramesh, Rakesh Aggarwal
July-September 2016, 7(3):144-146
DOI
:10.4103/2229-3485.184823
PMID
:27453832
During the conduct of clinical trials, it is not uncommon to have protocol violations or inability to assess outcomes. This article in our series on common pitfalls in statistical analysis explains the complexities of analyzing results from such trials and highlights the importance of "intention-to-treat" analysis.
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Common pitfalls in statistical analysis: Measures of agreement
Priya Ranganathan, CS Pramesh, Rakesh Aggarwal
October-December 2017, 8(4):187-191
DOI
:10.4103/picr.PICR_123_17
PMID
:29109937
Agreement between measurements refers to the degree of concordance between two (or more) sets of measurements. Statistical methods to test agreement are used to assess inter-rater variability or to decide whether one technique for measuring a variable can substitute another. In this article, we look at statistical measures of agreement for different types of data and discuss the differences between these and those for assessing correlation.
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BIOSTATISTICS
What to use to express the variability of data: Standard deviation or standard error of mean?
Mohini P Barde, Prajakt J Barde
July-September 2012, 3(3):113-116
DOI
:10.4103/2229-3485.100662
PMID
:23125963
Statistics plays a vital role in biomedical research. It helps present data precisely and draws the meaningful conclusions. While presenting data, one should be aware of using adequate statistical measures. In biomedical journals, Standard Error of Mean (SEM) and Standard Deviation (SD) are used interchangeably to express the variability; though they measure different parameters. SEM quantifies uncertainty in estimate of the mean whereas SD indicates dispersion of the data from mean. As readers are generally interested in knowing the variability within sample, descriptive data should be precisely summarized with SD. Use of SEM should be limited to compute CI which measures the precision of population estimate. Journals can avoid such errors by requiring authors to adhere to their guidelines.
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STATISTICS
Survival analysis in clinical trials: Basics and must know areas
Ritesh Singh, Keshab Mukhopadhyay
October-December 2011, 2(4):145-148
DOI
:10.4103/2229-3485.86872
Many clinical trials involve following patients for a long time. The primary event of interest in those studies is death, relapse, adverse drug reaction or development of a new disease. The follow-up time for the study may range from few weeks to many years. A different set of statistical procedures are employed to analyze the data, which involves time to event an analysis. It is a very useful tool in clinical research and provides invaluable information about an intervention. This article introduces the researcher to the different tools of survival analysis.
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REVIEW ARTICLES
Ethical issues in electronic health records: A general overview
Fouzia F Ozair, Nayer Jamshed, Amit Sharma, Praveen Aggarwal
April-June 2015, 6(2):73-76
DOI
:10.4103/2229-3485.153997
PMID
:25878950
Electronic health record (EHR) is increasingly being implemented in many developing countries. It is the need of the hour because it improves the quality of health care and is also cost-effective. Technologies can introduce some hazards hence safety of information in the system is a real challenge. Recent news of security breaches has put a question mark on this system. Despite its increased usefulness, and increasing enthusiasm in its adoption, not much attention is being paid to the ethical issues that might arise. Securing EHR with an encrypted password is a probable option. The purpose of this article is to discuss the various ethical issues arising in the use of the EHRs and their possible solutions.
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ORIGINAL ARTICLES
Challenges in recruitment and retention of clinical trial subjects
Rashmi Ashish Kadam, Sanghratna Umakant Borde, Sapna Amol Madas, Sundeep Santosh Salvi, Sneha Saurabh Limaye
July-September 2016, 7(3):137-143
DOI
:10.4103/2229-3485.184820
PMID
:27453831
Background:
Successful recruitment of patients is known to be one of the most challenging aspects in conduct of randomized controlled trials. Inadequate patient retention during conduct of trial affects conclusive results.
Objective:
To assess the level of challenges faced by Indian investigators in recruitment and retention of trial subjects.
Methods:
We developed a survey questionnaire on challenges encountered by investigators in subject recruitment and retention which was hosted on a web portal.
Results:
Seventy-three investigators from India participated in the survey. The frequently encountered challenges in subject recruitment were complexity of study protocol (38%), lack of awareness about clinical trials in patients (37%), and sociocultural issues related to trial participation (37%). About 63% of participants strongly agreed that creating a positive awareness about clinical trials among people through press and media, having a dedicated clinical research coordinator for trial (50.7%), and designing a recruitment strategy prior to study initiation (46.6%) would enhance recruitment. Almost 50.7% of participants agreed that interacting with medical community in vicinity of the study site and educating patients about clinical trials during routine outpatient department visits (46.6%) would enhance recruitment. Experiencing a serious adverse event, subject's fear for study procedures (47%) and side effects (44%) were thought to have a moderate effect on subject retention.
Conclusion:
Our survey has put forth factors related to negative publicity by media, lack of patient education about clinical trials; complex study designs are barriers to clinical trial recruitment in India. It is essential to devise innovative and effective strategies focusing on education of public and mass media about clinical research in India.
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STATISTICS
Common pitfalls in statistical analysis: Clinical versus statistical significance
Priya Ranganathan, CS Pramesh, Marc Buyse
July-September 2015, 6(3):169-170
DOI
:10.4103/2229-3485.159943
PMID
:26229754
In clinical research, study results, which are statistically significant are often interpreted as being clinically important. While statistical significance indicates the reliability of the study results, clinical significance reflects its impact on clinical practice. The third article in this series exploring pitfalls in statistical analysis clarifies the importance of differentiating between statistical significance and clinical significance.
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ORIGINAL ARTICLES
Prevalence of self-medication practices and its associated factors in Urban Puducherry, India
Kalaiselvi Selvaraj, Ganesh Kumar S, Archana Ramalingam
January-March 2014, 5(1):32-36
DOI
:10.4103/2229-3485.124569
PMID
:24551585
Background and Objectives:
Self medication is an important concern for health authorities at global level. This study was aimed to find the prevalence of self medication for allopathic drugs and associated factors among households of urban community. This study was also aimed at assessing the attitude of respondents who had experienced self-medication.
Materials and Methods:
This cross-sectional study was done in field practice area attached to a medical institution in urban Puducherry. A total of 352 subjects from 124 households were selected by random sampling. With pretested interview schedule, information regarding self-medication use in the past three months and associated sociodemographic factors, purpose, source of drug procurement, attitude toward self-medication use were collected.
Results:
Prevalence of self-medication was found to be 11.9%. Males, age >40 years and involving in moderate level activity of occupation, were found to be significantly associated with higher self-medication usage (
P
< 0.05). Fever (31%), headache (19%), and abdominal pain (16.7%) are most common illnesses where self-medication is being used. Telling the symptoms to pharmacist (38.1%) was the commonest method adopted to procure drugs by the users. Majority of the self-medication users expressed that self-medication is harmless (66.6%) and they are going to use (90%) and advice others also (73.8%) to use self-medication drugs.
Conclusion:
Self-medication is an important health issue in this area. Health education of the public and regulation of pharmacies may help in limiting the self-medication practices.
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STATISTICS
Common pitfalls in statistical analysis: The perils of multiple testing
Priya Ranganathan, CS Pramesh, Marc Buyse
April-June 2016, 7(2):106-107
DOI
:10.4103/2229-3485.179436
PMID
:27141478
Multiple testing refers to situations where a dataset is subjected to statistical testing multiple times - either at multiple time-points or through multiple subgroups or for multiple end-points. This amplifies the probability of a false-positive finding. In this article, we look at the consequences of multiple testing and explore various methods to deal with this issue.
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REVIEW ARTICLES
Pediatric clinical trials
Sandeep B Bavdekar
January-March 2013, 4(1):89-99
DOI
:10.4103/2229-3485.106403
PMID
:23533990
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STATISTICS
Common pitfalls in statistical analysis: Odds versus risk
Priya Ranganathan, Rakesh Aggarwal, CS Pramesh
October-December 2015, 6(4):222-224
DOI
:10.4103/2229-3485.167092
PMID
:26623395
In biomedical research, we are often interested in quantifying the relationship between an exposure and an outcome. “Odds” and “Risk” are the most common terms which are used as measures of association between variables. In this article, which is the fourth in the series of common pitfalls in statistical analysis, we explain the meaning of risk and odds and the difference between the two.
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Common pitfalls in statistical analysis: The use of correlation techniques
Rakesh Aggarwal, Priya Ranganathan
October-December 2016, 7(4):187-190
DOI
:10.4103/2229-3485.192046
PMID
:27843795
Correlation is a statistical technique which shows whether and how strongly two continuous variables are related. In this article, which is the eighth part in a series on 'Common pitfalls in Statistical Analysis', we look at the interpretation of the correlation coefficient and examine various situations in which the use of technique of correlation may be inappropriate.
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ORIGINAL ARTICLES
A questionnaire study on the knowledge, attitude, and the practice of pharmacovigilance among the healthcare professionals in a teaching hospital in South India
Sandeep Kumar Gupta, Roopa P Nayak, R Shivaranjani, Surendra Kumar Vidyarthi
January-March 2015, 6(1):45-52
DOI
:10.4103/2229-3485.148816
PMID
:25657902
Objective:
The primary objective of this study was to evaluate the knowledge, attitude, and practices (KAP) of the healthcare professionals about pharmacovigilance in Dhanalakshmi Srinivasan Medical College and Hospital (DSMCH), Perambalur (Tamil Nadu), a tertiary care teaching hospital. The second primary objective was to assess the causation of underreporting of adverse drug reactions (ADRs) as it needs to be well-assessed in India. The secondary objective was to compare the findings of this study with the results of the published studies from India on evaluation of the KAP of pharmacovigilance among healthcare professional.
Materials and Methods:
A cross-sectional study was carried out using a pretested questionnaire. The questionnaire was designed to assess the KAP regarding pharmacovigilance. The healthcare professionals (doctors, nurses, and pharmacists) working in the DSMCH, Perambalur (Tamil Nadu) during the study period were included. Only those who gave their consent to participate were included in the study. The data was analyzed by using the Statistical Package for Social Sciences (SPSS) statistical software, version 16.
Results:
One hundred and fifty pretested questionnaires were distributed among the healthcare professionals and 101 responded. 62.4% healthcare workers gave correct response regarding the definition of pharmacovigilance. 75.2% of healthcare workers were aware regarding the existence of a National Pharmacovigilance Program of India. 69.3% healthcare professional agreed that ADR reporting is a professional obligation for them. Among the participants, 64.4% have experienced ADRs in patients, but only 22.8% have ever reported ADR to pharmacovigilance center. Unfortunately only 53.5% healthcare workers have been trained for reporting adverse reactions. But, 97% healthcare professionals agreed that reporting of ADR is necessary and 92.1% were of the view that pharmacovigilance should be taught in detail to healthcare professional.
Conclusion:
This study demonstrated that knowledge and attitude towards pharmacovigilance is gradually improving among healthcare professionals, but unfortunately the actual practice of ADR reporting is still deficient among them.
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ORIGINAL ARTICLE
An evaluation of knowledge, attitude, and practice of adverse drug reaction reporting among prescribers at a tertiary care hospital
Chetna K Desai, Geetha Iyer, Jigar Panchal, Samidh Shah, RK Dikshit
October-December 2011, 2(4):129-136
DOI
:10.4103/2229-3485.86883
Objectives:
Spontaneous reporting is an important tool in pharmacovigilance. However, its success depends on cooperative and motivated prescribers. Under-reporting of adverse drug reactions (ADRs) by prescribers is a common problem. The present study was undertaken to evaluate the knowledge, attitude, and practices (KAP) regarding ADR reporting among prescribers at the Civil Hospital, Ahmedabad, to get an insight into the causes of under-reporting of ADRs.
Materials and Methods:
A pretested KAP questionnaire comprising of 15 questions (knowledge 6, attitude 5, and practice 4) was administered to 436 prescribers. The questionnaires were assessed for their completeness (maximum score 20) and the type of responses regarding ADR reporting. Microsoft Excel worksheet (Microsoft Office 2007) and Chi-Square test were used for statistical analysis.
Results:
A total of 260 (61%) prescribers completed the questionnaire (mean score of completion 18.04). The response rate of resident doctors (70.7%) was better than consultants (34.5%) (
P
< 0.001). ADR reporting was considered important by 97.3% of the respondents; primarily for improving patient safety (28.8%) and identifying new ADRs (24.6%). A majority of the respondents opined that they would like to report serious ADRs (56%). However, only 15% of the prescribers had reported ADRs previously. The reasons cited for this were lack of information on where (70%) and how (68%) to report and the lack of access to reporting forms (49.2%). Preferred methods for reporting were e-mail (56%) and personal communication (42%).
Conclusion:
The prescribers are aware of the ADRs and the importance of their reporting. However, under reporting and lack of knowledge about the reporting system are clearly evident. Creating awareness about ADR reporting and devising means to make it easy and convenient may aid in improving spontaneous reporting.
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CLINICAL DATA MANAGEMENT
Basics of case report form designing in clinical research
Shantala Bellary, Binny Krishnankutty, MS Latha
October-December 2014, 5(4):159-166
DOI
:10.4103/2229-3485.140555
PMID
:25276625
Case report form (CRF) is a specialized document in clinical research. It should be study protocol driven, robust in content and have material to collect the study specific data. Though paper CRFs are still used largely, use of electronic CRFs (eCRFS) are gaining popularity due to the advantages they offer such as improved data quality, online discrepancy management and faster database lock etc. Main objectives behind CRF development are preserving and maintaining quality and integrity of data. CRF design should be standardized to address the needs of all users such as investigator, site coordinator, study monitor, data entry personnel, medical coder and statistician. Data should be organized in a format that facilitates and simplifies data analysis. Collection of large amount of data will result in wasted resources in collecting and processing it and in many circumstances, will not be utilized for analysis. Apart from that, standard guidelines should be followed while designing the CRF. CRF completion manual should be provided to the site personnel to promote accurate data entry by them. These measures will result in reduced query generations and improved data integrity. It is recommended to establish and maintain a library of templates of standard CRF modules as they are time saving and cost-effective. This article is an attempt to describe the methods of CRF designing in clinical research and discusses the challenges encountered in this process.
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ORIGINAL ARTICLES
An evaluation of knowledge, attitude and practice of Indian pharmacists towards adverse drug reaction reporting: A pilot study
Akram Ahmad, Isha Patel, Rajesh Balkrishnan, GP Mohanta, PK Manna
October-December 2013, 4(4):204-210
DOI
:10.4103/2229-3485.120168
PMID
:24312887
Background:
Pharmacovigilance is a useful to assure the safety of medicines and protect consumers from their harmful effects. Healthcare professionals should consider Adverse Drug Reaction (ADR) reporting as part of their professional obligation and participate in the existent pharmacovigilance programs in their countries. In India, the National PV Program was re-launched in July 2010.
Objectives:
This survey was conducted in order to assess the knowledge, attitude and practice of Indian pharmacists with the aim of exploring the pharmacists' participation in ADR reporting system, identifying the reasons of under reporting and determining the steps that could be adopted to increase reporting rates.
Materials and Methods:
A cross-sectional survey was carried out among the pharmacists in India using a pretested questionnaire with 33 questions (10 questions on knowledge, 6 on attitude, 7 on practice, 7 on future of ADR reporting in India and 3 on benefits of reporting ADRs.). The study was conducted, over a period of 3 months from May 2012 to July 2012.
Results:
Out of the 600 participants to whom the survey was administered, a total of 400 were filled. The response rate of the survey was 67%. 95% responders were knowledgeable about ADRs. 90% participants had a positive attitude towards making ADRs reporting mandatory for practicing pharmacists. 87.5% participants were interested in participating in the National Pharmacovigilance program, in India. 47.5% respondents had observed ADRs in their practice, and 37% had reported it to the national pharmacovigilance center. 92% pharmacists believed reporting ADRs immensely helped in providing quality care to patients.
Conclusion
: The Indian pharmacists have poor knowledge, attitude, and practice (KAP) towards ADR reporting and pharmacovigilance. Pharmacists with higher qualifications such as the pharmacists with a PharmD have better KAP. With additional training on Pharmacovigilance, the Indian Pharmacists working in different sectors can become part of ADR reporting system.
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REGULATORY
Regulations and guidelines governing stem cell based products: Clinical considerations
Bobby George
July-September 2011, 2(3):94-99
DOI
:10.4103/2229-3485.83228
PMID
:21897884
The use of stem cells as medicines is a promising and upcoming area of research as they may be able to help the body to regenerate damaged or lost tissue in a host of diseases like Parkinson's, multiple sclerosis, heart disease, liver disease, spinal cord damage, cancer and many more. Translating basic stem cell research into routine therapies is a complex multi-step process which entails the challenge related to managing the expected therapeutic benefits with the potential risks while complying with the existing regulations and guidelines. While in the United States (US) and European Union (EU) regulations are in place, in India, we do not have a well-defined regulatory framework for "stem cell based products (SCBP)". There are several areas that need to be addressed as it is quite different from that of pharmaceuticals. These range from establishing batch consistency, product stability to product safety and efficacy through pre-clinical, clinical studies and marketing authorization. This review summarizes the existing regulations/guidelines in US, EU, India, and the associated challenges in developing SCBP with emphasis on clinical aspects.
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REVIEW ARTICLES
Placebo in clinical trials
Usha Gupta, Menka Verma
January-March 2013, 4(1):49-52
DOI
:10.4103/2229-3485.106383
PMID
:23533982
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ETHICS
Ethics committees in India: Facing the challenges!
Rashmi Kadam, Shashikant Karandikar
April-June 2012, 3(2):50-56
DOI
:10.4103/2229-3485.96444
The past few years have seen a tremendous rise in the number of clinical trials conducted in India. This is been attributed to the huge patient population, genetic diversity, and rich technical pool in our country. However, the economical upsurge in the clinical trial industry has also caused concerns pertaining to the efficiency of the Regulatory Agencies and Ethics Committees (EC). The EC plays an important role in the regulation of clinical research at the local level. However, it is seen that many ECs are oblivious to their roles and responsibilities. It is reported that ECs lack standard operating procedures, do not have a proper composition or adequate representation, thus affecting their functions in regulating clinical research. Moreover, ECs seem to function in isolation, as self-sufficient bodies, having no communication with the regulatory agency or other ECs. This brings forth the need for ECs to come together and share their experiences and observations, with the aim of updating themselves and refining their functions. Efforts also need to be focused on capacity building, centralized registration of ECs, and bringing an oversight mechanism in place. The Ethics Committees in India need to work in close association with forums such as the Forum for Ethics Review Committees in India and the Forum for Ethical Review Committees in Asia Pacific, in an effort towards empowering themselves.
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MEDICAL WRITING
Plagiarism: Why is it such a big issue for medical writers?
Natasha Das, Monica Panjabi
April-June 2011, 2(2):67-71
DOI
:10.4103/2229-3485.80370
PMID
:21731858
Plagiarism is the wrongful presentation of somebody else's work or idea as one's own without adequately attributing it to the source. Most authors know that plagiarism is an unethical publication practice. Yet, it is a serious problem in the medical writing arena. Plagiarism is perhaps the commonest ethical issue plaguing medical writing. In this article, we highlight the different types of plagiarism and address the issues of plagiarism of text, plagiarism of ideas, mosaic plagiarism, self-plagiarism, and duplicate publication. An act of plagiarism can have several repercussions for the author, the journal in question and the publication house as a whole. Sometimes, strict disciplinary action is also taken against the plagiarist. The article cites examples of retraction of articles, suspension of authors, apology letters from journal editors, and other such actions against plagiarism.
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QUALITY
Quality of clinical trials: A moving target
Arun Bhatt
October-December 2011, 2(4):124-128
DOI
:10.4103/2229-3485.86880
Quality of clinical trials depends on data integrity and subject protection. Globalization, outsourcing and increasing complexicity of clinical trials have made the target of achieving global quality challenging. The quality, as judged by regulatory inspections of the investigator sites, sponsors/contract research organizations and Institutional Review Board, has been of concern to the US Food and Drug Administration, as there has been hardly any change in frequency and nature of common deficiencies. To meet the regulatory expectations, the sponsors need to improve quality by developing systems with specific standards for each clinical trial process. The quality systems include: personnel roles and responsibilities, training, policies and procedures, quality assurance and auditing, document management, record retention, and reporting and corrective and preventive action. With an objective to improve quality, the FDA has planned new inspection approaches such as risk-based inspections, surveillance inspections, real-time oversight, and audit of sponsor quality systems. The FDA has partnered with Duke University for Clinical Trials Transformation Initiative, which will conduct research projects on design principles, data quality and quantity including monitoring, study start-up, and adverse event reporting. These recent initiatives will go a long way in improving quality of clinical trials.
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October, 2010