Rachel Gefen

Dr. Rachel Gefen

orcid

Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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17 April 2025 in Techniques in Coloproctology
Verified
Journal Article
Open access
PDF file
RGRachel Gefen
Rachel Gefen
JDJ. Dourado
J. Dourado
SES. H. Emile
S. H. Emile
AWA. Wignakumar
A. Wignakumar
PRP. Rogers
P. Rogers
SWSteven D. Wexner
Steven D. Wexner
Background: Fecal microbiota transplantation (FMT) has been shown to restore gut microbiome composition with an acceptable safety profile. FMT in inflammatory bowel disease, specifically ulcerative colitis (UC), has been investigated. We aimed to assess the efficacy of FMT in inducing UC remission. Methods: PubMed, Scopus, Google Scholar, and clinicaltrials.gov were searched for randomized control trials that assessed FMT in inducing UC remission. The primary outcome was combined clinical and endoscopic remission. Secondary outcomes were clinical remission, endoscopic remission, post-treatment overall adverse events, and colitis. Sensitivity analyses, meta-regression, bias assessment, and grading of certainty of evidence were performed. Results: A total of 14 studies including 600 patients (55.8% male; median age 40.7 years) were assessed. FMT was used in 299 patients and associated with significantly higher odds of combined clinical and endoscopic remission (OR 2.25, 95% CI 1.54, 3.3; p < 0.0001), clinical remission (OR 2.02, 95% CI 1.4, 2.93; p = 0.0002), and endoscopic remission (OR 1.95, 95% CI 1.17, 3.28; p = 0.011). The odds of post-treatment overall adverse events (OR 1.24, 95% CI 0.79, 1.95; p = 0.34) and colitis (OR 0.85, 95% CI 0.52, 1.93; p = 0.512) were similar between groups. Compared with baseline, FMT was more effective when biologics (OR 2.71), steroids (OR 2.27), or methotrexate (OR 3.07) were used as pre-FMT treatment. Oral delivery of FMT (OR 3.15) and pooled donors (OR 3.32) led to higher odds of remission. On meta-regression, pooled donors and methotrexate pre-treatment were associated with an increased likelihood of remission. Conclusions: FMT is promising in inducing UC remission. Administration of medical treatments before FMT may help achieve higher remission rates. Current evidence shows that oral delivery of FMT and multidonor FMT may confer better results.

27 June 2023 in Colorectal Disease
Verified
Journal Article
Open access
RGRachel Gefen
Rachel Gefen
ZGZoe Garoufalia
Zoe Garoufalia
NHNir Horesh
Nir Horesh
MFMichael R. Freund
Michael R. Freund
SESameh Hany Emile
Sameh Hany Emile
SWSteven D. Wexner
Steven D. Wexner
Background: Despite the pivotal role of magnetic resonance imaging (MRI) in rectal cancer staging and evaluation, the reliability of restaging MRI after neoadjuvant therapy is still debatable. This study aimed to assess the accuracy of restaging MRI by comparing post‐neoadjuvant MRI findings with those of the final pathology.Methods: This study was a retrospective review of the medical records of adult rectal cancer patients who had restaging MRI following neoadjuvant therapy and prior to rectal cancer resection in a NAPRC‐certified rectal cancer centre between 2016 and 2021. The study compared findings of preoperative, post‐neoadjuvant MRI with final pathology relative to T stage, N stage, tumour size, and circumferential resection margin (CRM) status.Results: A total of 126 patients were included in the study. We found fair concordance (kappa −0.316) for T stage between restaging MRI and pathology report, and slight concordance for N stage and CRM status (kappa −0.11, kappa = 0.089, respectively). Concordance rates were lower for patients following total neoadjuvant treatment (TNT) or with a low rectal tumour. In total, 73% of patients with positive N pathology status had negative N status in the restaging MRI. Sensitivity and specificity regarding positive CRM in post‐neoadjuvant treatment MRI were 45.45% and 70.4%, respectively.Conclusion: We found low concordance levels between restaging MRI and pathology regarding TN stage and CRM status. Concordance levels were even lower for patients after TNT regimen and with a low rectal tumour. In the era of TNT and watch‐and‐wait approach, we should not rely solely on restaging MRI to make post‐neoadjuvant treatment decisions.

1 April 2023 in Surgery
Verified
Journal Article
Closed access
SESameh Hany Emile
Sameh Hany Emile
ZGZoe Garoufalia
Zoe Garoufalia
SBSamer Barsom
Samer Barsom
NHNir Horesh
Nir Horesh
RGRachel Gefen
Rachel Gefen
SWSteven D. Wexner
Steven D. Wexner

15 May 2023 in Surgery
Verified
Journal Article
Closed access
SESameh Hany Emile
Sameh Hany Emile
ZGZoe Garoufalia
Zoe Garoufalia
Pauline AeschbacherPauline Aeschbacher
Pauline Aeschbacher
NHNir Horesh
Nir Horesh
RGRachel Gefen
Rachel Gefen
SWSteven D. Wexner
Steven D. Wexner

19 September 2023 in Surgery
Verified
Journal Article
Closed access
RGRachel Gefen
Rachel Gefen
SESameh Hany Emile
Sameh Hany Emile
NHNir Horesh
Nir Horesh
ZGZoe Garoufalia
Zoe Garoufalia
SWSteven D. Wexner
Steven D. Wexner

14 September 2022 in The American Surgeon™
Verified
Journal Article
Closed access
ZGZoe Garoufalia
Zoe Garoufalia
RGRachel Gefen
Rachel Gefen
SESameh Hany Emile
Sameh Hany Emile
PZPeige Zhou
Peige Zhou
ESEmanuela Silva-Alvarenga
Emanuela Silva-Alvarenga
SWSteven D. Wexner
Steven D. Wexner
Background: Postoperative adhesions may occur after >90% of laparotomies and is the most common cause of small bowel obstruction (SBO). Despite the high incidence, there is a lack of data related to financial implications of adhesion-related SBO (ASBO). This systematic literature review of in-hospital costs for treatment of ASBO searched PubMed, Scopus and Google Scholar databases according to PRISMA guidelines. Exclusion criteria were reviews, editorials, clinical vignettes, studies of patients <18 years of age, studies with no English full text and studies assessing adhesiolysis for causes other than SBO or that used extrapolations with economic models. Main outcome measures were financial costs per patient and national costs. Results: Seven studies, published between 1999 and 2016, incorporating a total of 39 573 patients, were identified. Four were undertaken in European countries, one in the USA, 1 in New Zealand and 1 in Nigeria. Overall national costs regarding treatment of patients with ASBO ranged between $3.468 million and $1.77 billion. Median overall cost in the medical management group was $2371.5 ($1814-$2568) vs $12370 ($4914-$25321) in the surgical group. Median length of stay was 4 (3-7) days for patients conservatively treated and 11.5 (8-16.3) days for patients who underwent surgery. Median length of stay of operated patients on was almost triple that of patients conservatively managed. Conclusions: Given the major financial implications of ASBO, further initiatives are needed to avoid operations for SBO when clinically appropriate and minimize delays taking patients with high suspicion of complete SBO to the operating room.