Peer Review History
| Original SubmissionJuly 1, 2026 |
|---|
|
Dear Dr. Othman, Thank you for submitting your manuscript to PLOS ONE. After careful consideration, we feel that it has merit but does not fully meet PLOS ONE’s publication criteria as it currently stands. Therefore, we invite you to submit a revised version of the manuscript that addresses the points raised during the review process. Please submit your revised manuscript by Oct 09 2026 11:59PM. If you will need more time than this to complete your revisions, please reply to this message or contact the journal office at plosone@plos.org. When you're ready to submit your revision, log on to https://www.editorialmanager.com/pone/ and select the 'Submissions Needing Revision' folder to locate your manuscript file.
If you would like to make changes to your financial disclosure, please include your updated statement in your cover letter. Guidelines for resubmitting your figure files are available below the reviewer comments at the end of this letter. If applicable, we recommend that you deposit your laboratory protocols in protocols.io to enhance the reproducibility of your results. Protocols.io assigns your protocol its own identifier (DOI) so that it can be cited independently in the future. For instructions see: https://journals.plos.org/plosone/s/submission-guidelines#loc-laboratory-protocols. Additionally, PLOS ONE offers an option for publishing peer-reviewed Lab Protocol articles, which describe protocols hosted on protocols.io. Read more information on sharing protocols at https://plos.org/protocols?utm_medium=editorial-email&utm_source=authorletters&utm_campaign=protocols. As the corresponding author, your ORCID iD is verified in the submission system and will appear in the published article. PLOS supports the use of ORCID, and we encourage all coauthors to register for an ORCID iD and use it as well. Please encourage your coauthors to verify their ORCID iD within the submission system before final acceptance, as unverified ORCID iDs will not appear in the published article. Only the individual author can complete the verification step; PLOS staff cannot verify ORCID iDs on behalf of authors. We look forward to receiving your revised manuscript. Kind regards, Dr. Awais ALi Guest Editor PLOS One Journal Requirements: When submitting your revision, we need you to address these additional requirements. 1. Please ensure that your manuscript meets PLOS ONE's style requirements, including those for file naming. The PLOS ONE style templates can be found at https://journals.plos.org/plosone/s/file?id=wjVg/PLOSOne_formatting_sample_main_body.pdf and 2. We note that you have indicated that there are restrictions to data sharing for this study. For studies involving human research participant data or other sensitive data, we encourage authors to share de-identified or anonymized data. However, when data cannot be publicly shared for ethical reasons, we allow authors to make their data sets available upon request. For information on unacceptable data access restrictions, please see http://journals.plos.org/plosone/s/data-availability#loc-unacceptable-data-access-restrictions. Before we proceed with your manuscript, please address the following prompts: a) If there are ethical or legal restrictions on sharing a de-identified data set, please explain them in detail (e.g., data contain potentially identifying or sensitive patient information, data are owned by a third-party organization, etc.) and who has imposed them (e.g., a Research Ethics Committee or Institutional Review Board, etc.). Please also provide contact information for a data access committee, ethics committee, or other institutional body to which data requests may be sent. b) If there are no restrictions, please upload the minimal anonymized data set necessary to replicate your study findings to a stable, public repository and provide us with the relevant URLs, DOIs, or accession numbers. Please see http://www.bmj.com/content/340/bmj.c181.long for guidelines on how to de-identify and prepare clinical data for publication. For a list of recommended repositories, please see https://journals.plos.org/plosone/s/recommended-repositories. You also have the option of uploading the data as Supporting Information files, but we would recommend depositing data directly to a data repository if possible. Please update your Data Availability statement in the submission form accordingly. 3. Your ethics statement should only appear in the Methods section of your manuscript. If your ethics statement is written in any section besides the Methods, please delete it from any other section. 4. If the reviewer comments include a recommendation to cite specific previously published works, please review and evaluate these publications to determine whether they are relevant and should be cited. There is no requirement to cite these works unless the editor has indicated otherwise. [Note: HTML markup is below. Please do not edit.] Reviewers' comments: Reviewer's Responses to Questions Comments to the Author 1. Is the manuscript technically sound, and do the data support the conclusions? Reviewer #1: Yes Reviewer #2: Yes ********** 2. Has the statistical analysis been performed appropriately and rigorously? -->?> Reviewer #1: Yes Reviewer #2: Yes ********** 3. Have the authors made all data underlying the findings in their manuscript fully available??> The PLOS Data policy Reviewer #1: Yes Reviewer #2: Yes ********** 4. Is the manuscript presented in an intelligible fashion and written in standard English??> Reviewer #1: Yes Reviewer #2: Yes ********** Reviewer #1: Overall Assessment This manuscript presents a retrospective seven-year cohort evaluating therapeutic plasma exchange (TPE) in an Egyptian tertiary center. The topic is clinically relevant because real-world evidence from low- and middle-income countries remains limited. The study includes 221 patients and evaluates efficacy, safety, and predictors of outcomes. While the work has merit, substantial revisions are required before publication. Major Comments 1. Manuscript Length The manuscript is considerably longer than necessary. The Introduction, Methods, and Discussion should be reduced by approximately 30%, removing repeated methodological descriptions and excessive technical details. 2. Study Objectives The objectives are overly broad. Clearly distinguish primary, secondary, and exploratory objectives. 3. Study Design The retrospective, single-center nature of the study should be emphasized more consistently, and causal language should be avoided. 4. Statistical Modeling Multiple regression models were fitted despite only 32 mortality events. Additional information on model diagnostics, multicollinearity, calibration, and internal validation is required. 5. Multiple Comparisons Numerous subgroup analyses increase the risk of type I error. Adjustment for multiple testing should be considered. 6. Risk Model The proposed three-tier mortality model requires internal or external validation before being presented as a clinically useful model. 7. Disease Heterogeneity Pooling renal, neurological, hematological, and metabolic diseases introduces substantial heterogeneity that should be better justified. 8. Clinical Response Combining disease-specific outcomes into one composite response variable may reduce clinical interpretability. Statistical Comments Please report missing data percentages, model diagnostics, proportional hazards assumptions, multicollinearity assessment, ROC/calibration results where appropriate, and sensitivity analyses using the multiple imputation dataset. Minor Comments • Reduce the number of numerical values in the abstract. • Shorten the Introduction by removing well-established background information. • Merge repetitive methodological descriptions. • Move extensive subgroup analyses to Supplementary Material. • Shorten several overly long sentences for readability. Strengths • Largest reported adult Egyptian multi-system TPE cohort. • Seven years of consecutive real-world experience. • Clinically relevant outcome measures. • Comprehensive safety assessment. • Appropriate use of ASFA classification. • Generally well-written manuscript. Final Recommendation The study addresses an important clinical question and provides valuable regional evidence. However, substantial revision is necessary to improve focus, strengthen the statistical reporting, reduce redundancy, and temper interpretation of exploratory findings. Reviewer #2: Major Issues Requiring Resolution 1. Overinterpretation of Underpowered Subgroup Analyses Current Issue: Several disease-specific multivariate models have events-per-variable (EPV) ratios well below the conventional threshold of 10: TTP complete remission model (Table 9): EPV = 3.9 (27 events, 7 variables in complete-case analysis) GBS poor functional outcome model (Table 12): EPV ≈ 2.2 (13 events, 6 variables) SLE subgroup (Table 7): n=23 with 12 deaths The authors acknowledge this limitation in the text but still present the findings with relatively strong language ("independent predictors," "confirming," "validating"). The abstract also states these findings without sufficient caveats. Action Required: Move the TTP and GBS multivariate models to supplementary material or clearly label them as "exploratory" in the main text with prominent caveats Revise the abstract to state: "In exploratory analyses, PLASMIC score ≥6 and time to TPE ≤2 days were associated with complete remission in TTP, and Hughes score ≥4 and time to TPE >7 days were associated with poor functional outcome in GBS. These findings require external validation before clinical application." Add a dedicated "Exploratory Subgroup Analyses" subsection in Results with a clear statement that these findings are hypothesis-generating Consider whether to present the SLE subgroup (n=23) as a separate table or merge it into the main results with appropriate caveats 2. Three-Tier Risk Model: Development and Validation Current Issue: The authors propose a three-tier risk stratification model (Section 14) based on "synthesizing the multivariate regression, ROC curve analysis, Kaplan-Meier survival estimates, and indication-specific mortality data." However: The model is described as "developed post-hoc following completion of primary data analysis" It has "undergone only internal validation (bootstrap resampling)" and "has not been externally validated" The development methodology is not sufficiently detailed to be reproducible No formal model performance metrics (calibration, discrimination in the validation sample) are provided The model combines multiple data sources in a way that may lead to overfitting Action Required: Either move the three-tier model to supplementary material with a clear statement that it is hypothesis-generating, OR Provide a much more detailed development methodology including: How the tiers were derived (exact algorithm or rules) Performance metrics (calibration, discrimination) in the derivation cohort Internal validation results (bootstrap-corrected performance) A clear statement that the model is not validated for clinical use Add a prominent limitation: "The three-tier model was developed in a single-center cohort without external validation. It should be considered exploratory and hypothesis-generating until validated in independent cohorts." Patient Classification: TTP and SLE Assignment Current Issue: The authors classify TTP patients with predominant renal involvement under renal indications (n=41) and those with predominant hematologic manifestations under hematologic indications (n=13). This is a reasonable approach but requires more justification. Action Required: Add a brief explanation of why this classification was chosen: "This classification preserves the integrity of between-group comparisons (renal vs. neurologic vs. hematologic) based on the primary management pathway, while allowing disease-specific subgroup analyses (TTP, SLE, GBS, MG) to be performed on unified cohorts across groups." Acknowledge the limitation: "This classification may introduce some misclassification bias, as TTP is a multi-system disease, but it reflects real-world practice where patients are managed primarily by the specialty responsible for their predominant manifestation." 5. Propensity Score Matching: Limited Overlap and Generalizability Current Issue: The FFP vs. albumin propensity score matching achieved only 50% match rate for FFP recipients, raising questions about generalizability. The authors explain this appropriately, but could strengthen the discussion. Action Required: Add a clearer statement: "The limited overlap between FFP and albumin recipients confirms that these populations were fundamentally different by design, with FFP reserved for critically ill patients requiring factor replacement. The matched sample therefore represents the subset of patients where clinical equipoise existed, allowing unbiased estimation of the treatment effect." Acknowledge that the results may not generalize to patients who could not be matched (the sickest FFP patients) 6. Adverse Event Reporting: Patient vs. Session Level Current Issue: The authors report adverse events at both patient level and session level, which is appropriate. However, the infection rate (11.7% of patients) appears high compared to some international series. Action Required: Add a brief discussion: "The infection rate of 11.7% in our cohort is higher than some international reports (5-8%) but reflects the cumulative immunosuppressive effect of repeated plasma exchange, particularly immunoglobulin depletion, in the context of severe underlying disease states in a resource-limited setting." Consider adding the infection rate per session for comparison with international data 7. Missing Data and Imputation Current Issue: The authors report 3.7% overall missingness, with some variables (PLASMIC score components, ADAMTS13, lipid profile) having up to 12% missingness. They performed multiple imputation but present complete-case analysis as primary. Action Required: Briefly state that complete-case and imputed results were consistent Acknowledge that missing data for ADAMTS13 (37% of TTP patients) is a limitation ********** what does this mean?). If published, this will include your full peer review and any attached files. If you choose “no”, your identity will remain anonymous but your review may still be made public. Do you want your identity to be public for this peer review? For information about this choice, including consent withdrawal, please see our Privacy Policy Reviewer #1: No Reviewer #2: No ********** [NOTE: If reviewer comments were submitted as an attachment file, they will be attached to this email and accessible via the submission site. Please log into your account, locate the manuscript record, and check for the action link "View Attachments". If this link does not appear, there are no attachment files.] To ensure your figures meet our technical requirements, please review our figure guidelines: https://journals.plos.org/plosone/s/figures You may also use PLOS’s free figure tool, NAAS, to help you prepare publication quality figures: https://journals.plos.org/plosone/s/figures#loc-tools-for-figure-preparation. NAAS will assess whether your figures meet our technical requirements by comparing each figure against our figure specifications. |
| Revision 1 |
|
Therapeutic Plasma Exchange Across Multiple Organ Systems in an Egyptian Tertiary Center: A Seven-Year Real-World Cohort Study PONE-D-26-30667R1 Dear Dr. Othman, We’re pleased to inform you that your manuscript has been judged scientifically suitable for publication and will be formally accepted for publication once it meets all outstanding technical requirements. Within one week, you’ll receive an e-mail detailing the required amendments. When these have been addressed, you’ll receive a formal acceptance letter and your manuscript will be scheduled for publication. An invoice will be generated when your article is formally accepted. Please note, if your institution has a publishing partnership with PLOS and your article meets the relevant criteria, all or part of your publication costs will be covered. Please make sure your user information is up-to-date by logging into Editorial Manager at Editorial Manager® and clicking the ‘Update My Information' link at the top of the page. For questions related to billing, please contact billing support. If your institution or institutions have a press office, please notify them about your upcoming paper to help maximize its impact. If they’ll be preparing press materials, please inform our press team as soon as possible -- no later than 48 hours after receiving the formal acceptance. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. Kind regards, Dr. Awais ALi Guest Editor PLOS One <img alt=" " aria-label=" " class="an1" data-emoji=" " draggable="false" loading="lazy" src="https://fonts.gstatic.com/s/e/notoemoji/17.0/1f517/72.png" style="height: 1.2em; width: 1.2em; vertical-align: middle;" /> ORCID: 0000-0002-4514-9509 Loop Profile : 2395035 <img alt=" " aria-label=" " class="an1" data-emoji=" " draggable="false" loading="lazy" src="https://fonts.gstatic.com/s/e/notoemoji/17.0/1f7e3/72.png" style="height: 1.2em; width: 1.2em; vertical-align: middle;" /> SciProfiles: 3367557 <img alt=" " aria-label=" " class="an1" data-emoji=" " draggable="false" loading="lazy" src="https://fonts.gstatic.com/s/e/notoemoji/17.0/1f7e0/72.png" style="height: 1.2em; width: 1.2em; vertical-align: middle;" /> Scopus Author ID: Additional Editor Comments (optional): Reviewers' comments: |
| Formally Accepted |
|
PONE-D-26-30667R1 PLOS One Dear Dr. Othman, I'm pleased to inform you that your manuscript has been deemed suitable for publication in PLOS One. Congratulations! Your manuscript is now being handed over to our production team. At this stage, our production department will prepare your paper for publication. This includes ensuring the following: * All references, tables, and figures are properly cited * All relevant supporting information is included in the manuscript submission, * There are no issues that prevent the paper from being properly typeset You will receive further instructions from the production team, including instructions on how to review your proof when it is ready. Please keep in mind that we are working through a large volume of accepted articles, so please give us a few days to review your paper and let you know the next and final steps. Lastly, if your institution or institutions have a press office, please let them know about your upcoming paper now to help maximize its impact. If they'll be preparing press materials, please inform our press team within the next 48 hours. Your manuscript will remain under strict press embargo until 2 pm Eastern Time on the date of publication. For more information, please contact onepress@plos.org. You will receive an invoice from PLOS for your publication fee after your manuscript has reached the completed accept phase. If you receive an email requesting payment before acceptance or for any other service, this may be a phishing scheme. Learn how to identify phishing emails and protect your accounts at https://explore.plos.org/phishing. If we can help with anything else, please email us at customercare@plos.org. Thank you for submitting your work to PLOS One and supporting open access. Kind regards, PLOS One Editorial Office Staff on behalf of Dr. Awais ALi Guest Editor PLOS One |
Open letter on the publication of peer review reports
PLOS recognizes the benefits of transparency in the peer review process. Therefore, we enable the publication of all of the content of peer review and author responses alongside final, published articles. Reviewers remain anonymous, unless they choose to reveal their names.
We encourage other journals to join us in this initiative. We hope that our action inspires the community, including researchers, research funders, and research institutions, to recognize the benefits of published peer review reports for all parts of the research system.
Learn more at ASAPbio .