Gene Therapy for Genetic Male Infertility
Categories Medical news

New Molecular Technique to Overcome the Genetic Male Infertility

Male infertility refers to inability of a man to cause pregnancy in a fertile woman. Though there are many causes for this infertility such as low sperm count, and hormonal imbalances, but common cause of this infertility in man lies in genetic defects.

Generally X and Y chromosomes are responsible for the sex determination. It is well known that combination of two X chromosomes (XX) results in baby girl, and combination of one X and one Y chromosomes (XY) results in baby boy. Observations from several investigations reported that one in 500 men will possess an extra X or Y chromosome, and this extra chromosome will interrupt the formation of mature and active spermatozoa and this condition is referred to Klinefelter syndrome (XXY) or double Y syndrome (XYY).

Considering the research work published in the journal Science, researchers at Francis Crick Institute in London, in collaboration with the University of Kyoto (Japan) has developed a new technique and experimented in mice.

In this study, researchers collected small tissue fragments from the XXY and XYY mice and developed fibroblasts which then converted to stem cells, and in the process of conversion, some of stem cells lost the extra sex chromosome. In the laboratory chemical signals were employed to convert these new stem cells to mature spermatozoa, and created mouse pups through assisted reproduction. This technique is at preliminary stage, but offers a potential approach to overcome genetic cause of male infertility.

Anti-Lipidemic Drug
Categories Medical news

Anti-Lipidemic Drug Have Potential to Halt Infectious Diseases

For researchers, there is a great interest in identifying new therapeutic applications for the existing class of drugs, now, Duke Scientists choose Statins, cholesterol lowering drugs.

Article from Proceedings of the National Academy of Sciences, gave a new insight for Dennis C. Ko (assistant professor of molecular genetics and microbiology at Duke University School of Medicine) to understand the mechanisms that govern human susceptibility for various infectious diseases, particularly Salmonella bacteria, that uses cholesterol of cell membranes to infect host cells.

As a first step, Ko and his team conducted studies on human cell lines by exposing them to green fluorescent tagged Salmonella typhi and observed differences in bacterial invasion rates between cell lines. Researches had already found that a single nucleotide of DNA in VAC14 gene is associated with bacterial invasions.

By knocking out this VAC14 gene, researchers observed an equal rate of bacterial invasion. Unexpectedly, they also observed that a higher rate of invasion was associated in the cell lines with high cholesterol levels.

Considering the cholesterol levels, Monica Alvarez, researcher at Ko lab, run an experiment on zebra-fish by adding cholesterol lowering drug (Ezetimibe or Zetia) to the waters and injected the fish with Salmonella typhi. She found that fishes in drug treated water are very less susceptible for infection compared to the non-treated.

Considering this mechanism, Ko said that, identifying such new therapeutic applications for the existing class of drugs will lead us to a step ahead in research.

Narrative Writing in Clinical Research
Categories Medical Writing

Narrative Writing in Clinical Research: Guidelines for a Medical Writer

Narrative writing or writing patient safety narratives is an integral part of any clinical study report writing. Before dwelling into its guidelines, let us first understand what it is and what importance it carries in clinical research.

In simple terms, a narrative is a brief summary of the adverse events experienced by the patients during a clinical trial of a drug. It is submitted along with the clinical study report to establish any causal relationship between the events experienced by the patient and the drug under investigation. This also helps in establishing the drug safety profile.

Patient narratives are generally written for deaths, serious adverse events, any adverse event of special clinical interest, and events leading to permanent discontinuation of the patient from the trial.

Components of a patient narrative

As per International Conference on Harmonisation (ICH) E3 guidelines, a patient narrative must contain the following:

  • Nature, intensity, and outcome of the event
  • Clinical course of the event
  • Timing of study drug administration
  • Relevant laboratory measures
  • How the event was treated
  • Action taken with respect to the study drug
  • Post mortem findings (in case of death of the patient)
  • Investigator’s and sponsor’s (one who sponsors the clinical study) opinion on causality
  • Patient identifier
  • His age, sex, and general clinical condition
  • Disease being treated
  • Medical history of the patient
  • Medications taken in the past or taking currently
  • Any ongoing medical condition

What do you need to know before drafting a patient narrative?

1.Thorough knowledge and understanding of the therapeutic area of the drug under investigation

2.Knowledge of the regulatory requirements

Patient narratives are usually submitted to the regulatory authorities along with the clinical study report, included either as a text in Section 12.3.2 if the number of narratives is less (6–10) or provided in Section 14.3.3 as an appendix.

3.Understanding of the role and expectations of the regulatory authorities

As narratives are reviewed by the regulatory authorities, their objectives must be borne in mind before drafting a narrative. These objectives are:

  • Identification and close examination of adverse events that require further monitoring
  • Identification of frequency and severity of unexpected adverse events
  • Identification of the factors affecting the occurrence of adverse drug reactions like patient’s age, gender, ethnicity, race, associated illness, abnormalities of renal or hepatic function, and genetic characteristics or drug-related factors such as dose, plasma concentration, duration of exposure, and concomitant medications.
  • Evaluating and analyzing the data for any limitations and safety analysis of the drug.

4.Sources of data

You can use various sources of information while preparing a patient narrative. These include:

  • Primary source which is the clinical database listings
  • Secondary source which include Council for International Organizations of Medical Sciences (CIOMS) forms, Case Report Forms (CRFs), MedWatch forms, and Data Clarification Forms (DCFs)

5.The number of patient narratives to be prepared

Challenges in narrative writing process

The most common challenges observed while drafting a patient narrative are:

  • Large number of resources required for the project
  • Maintaining consistency in the narratives
  • Timely delivery of high quality narratives
  • Lack of standardized data sources or patient profiles
  • High variability in template finalization before and after sample narratives due to differences in opinion of reviewers
  • Change in reviewers in intermediate or later stages of the project
  • Delay in review cycles
  • Delay in receiving consensus on comments and queries from the clinical team

How to overcome these challenges?

    1. Hold a meeting with all the stakeholders of the project and finalize a template for the sample narrative, in consensus with the clinical team.
    2. Review your clinical database listings for all the necessary information as per the agreed narrative template.
    3. Use standardized data sources throughout the process. Also use a resource utilization tracker that lists down all the ongoing studies, percent utilization and free capacity of the resources in each project.
    4. Use a standardized narrative tracking sheet to record details like the list of patients requiring narrative, their criteria for narrative, author, reviews, and dates.
    5. Standardize the review process and have proactive communication with all the stakeholders including the clinical team for finalizing the sample narrative.
    6. Finalize the sample narrative before dispatching future batches.
    7. Use an automation tool for narrative writing. This is particularly helpful in case of large volumes of narratives to ensure consistency, quality, and timely delivery of narratives. However, medical and scientific review, data quality control, and quality calibration must be performed regularly even if the narratives are generated using an automation tool. Quality can be checked and maintained by using a quality tracker to calculate any major or minor errors in the narrative.

Tips for writing an effective patient narrative

    • Always use hard space and hard hyphens for days, dates, and laboratory values to avoid splitting on the next page or next line except at the beginning of a sentence (hard hyphen: ctrl + shift + hyphen; hard space: ctrl + shift + space)
    • Be consistent while using the patient throughout the narrative.
    • Tag the narrative template against the information available in data sources to help the reviewer track the information easily.
    • Always use generic names for the patient’s concomitant medications or treatment medications for adverse events. However, for combination drugs, generic drug name should be provided along with the trade name in brackets; for example, lisinopril-hydrochlorothiazide (Zestoretic)
    • For describing the adverse event and medical history or ongoing condition of the patient, always use the preferred terms like pain in extremity should be reported as pain in hands or pain in legs.
    • Quick check your narrative before submitting it to the scientific reviewer.

Quality control (QC) is an important step in the delivery of a narrative project. If time is not a constraint, QC must be performed during the review and final delivery stages. However, if that is not feasible, a thorough and independent final QC should suffice.

Cognibrain healthcare technologies are the best provider of medical writing and healthcare communication services. Our Medical writing services include clinical and regulatory writing which encompasses clinical study reports, clinical study protocol, investigator brochures and pharmacovigilance writing like patient safety narratives, periodic safety update reports. Our non clinical or non regulatory medical writing services include medical manuscript writing service for journal submission, publication support for medical journals, medical abstract writing and poster presentation for medical conference, systemic review and meta analysis. We also provide healthcare communication services like medico marketing writing, product monographs, medical content writing for therapeutic products, medical devices, nutraceutical products and treatment procedures and medical websites.

Gene Critical To Pancreatic Cancer Cell Growth Identified
Categories Medical news

Gene Critical To Pancreatic Cancer Cell Growth Identified

Pancreatic cancer is a deadly disease with too little options of effective treatment so far. But the study conducted at Yale Cancer Centre has identified a gene critical to the growth of pancreatic cancer cells, revealing new options in its field of treatment.

Cancer cells require specific nutrients to survive and divide quickly. This property of cancer cells has been utilized in this study conducted by Narendra Wajapayee, associate professor of pathology, and his team. They searched the sets of genes involved in metabolism regulation in pancreatic cancer tissue. Out of the 13 metabolic genes identified, they narrowed their search to four genes, which when blocked reduced the growth of pancreatic cancer cells.

Further studies depicted one particular gene, PON2 that was required for the growth of pancreatic tumours and their spread to other organs like liver and lungs. The gene PON2 was found to increase the ability of pancreatic cancer cells to use glucose for their survival and migration to other parts of the body.
On the basis of this study, Wajapayee and his team are further working to develop inhibitors for blocking the gene PON2 and thus inhibit the growth of pancreatic cancer.

New Ultrafast Antibiotic Resistance Test developed
Categories Medical news

New Ultrafast Antibiotic Resistance Test developed

Antibiotic resistance is a growing health concern owing to the incorrect use of antibiotics for treatment. The problem can only be counteracted by reliable, quick, and easy methods for determination of bacterial resistance patterns and providing the right antibiotic from the beginning. But the current methods take too long to determine the antibiotic resistance.

Therefore, researchers at Uppsala University have developed a test to rapidly determine the resistance or susceptibility of bacteria to antibiotics. The test initially determined for urinary tract infections enables the patients to take home the right antibiotic right after the first appointment with the doctor.
“The new method allows determination of bacterial resistance patterns in urinary tract infections in 10 to 30 minutes as compared to the current methods that require one to two days,” says Ph.D. student Ozden Baltekin, who performed most of the experimental work.

This method is based on sensitive optical and analytical techniques to study the behaviour of individual bacteria. Monitoring whether individual bacteria grow in the presence or absence of antibiotics reveals their resistance or susceptibility within few minutes.

“Astrego Diagnostics AB is now developing this method into a user-friendly product that could be used in the hospitals and health centres for rapid determination of antibiotic resistance and reduce unnecessary use of antibiotics,” says Dan Andersson, one of the researchers behind this study. He further believes in the utility of the method for other infections like blood where the correct and prompt choice of antibiotic is more crucial for the patient.