Marek Stefanowicz

Dr. Marek Stefanowicz


Research Focus & Metrics

Academic Career Length

8Years (2019-Present)

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

Representative Publications

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30 August 2021 in Journal of Clinical Medicine
Verified
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DJDorota Jarzębicka
Dorota Jarzębicka
PCPiotr Czubkowski
Piotr Czubkowski
JSJoanna Sieczkowska-Gołub
Joanna Sieczkowska-Gołub
JKJaroslaw Kierkus
Jaroslaw Kierkus
AKAdam Kowalski
Adam Kowalski
GOGrzegorz Oracz
Grzegorz Oracz
Background: In spite of the introduction of peroral endoscopic myotomy (POEM), Heller myotomy (HM) remains the mainstay of treatment and the role of pneumatic dilatation (PD) is being debated. The aim of this study was to present a single-center experience in the diagnostic approach and treatment of esophageal achalasia (EA), including the long-term assessment of the QoL. Methods: Data collection was based on the retrospective analysis of clinical notes and prospective interviews with patients and their parents. Results: The study group consisted of 60 patients with EA (F: 26, M: 34), with a median age of 12.0 (1–17) years at diagnosis. The time from the first symptoms until the diagnosis was 1.0 year (0.5–2.0) and the most common were: regurgitation (91.3%), dysphagia (84.8%), and chest pain (47.8%). The diagnostic approach showed a high sensitivity for barium X-ray follow through, esophageal manometry, and endoscopy. Overall, a long-term good outcome of HM was achieved in 27 out of 37 patients (73%) and it was negatively affected by the time between the first symptoms and the diagnosis. Out of the 16 patients who underwent PD before HM, a good outcome was achieved in 14 patients (87.5%), compared to 13 out of 21 patients (62%) who only underwent HM (p = 0.22). Concomitant fundoplication was routinely performed, and 18% required post-operative endoscopic dilatation. At the end of the 12.1 (0.7–26.6)-year follow up, most patients had a good QoL, which significantly corresponded with the treatment outcomes. Conclusions: Patients suspected of EA should undergo a thorough clinical evaluation including a manometry, a barium X-ray, and an endoscopy. HM is a safe and effective treatment for achalasia and the outcome is not worsened by a preceding endoscopic PD. In most patients, HM alleviates symptoms, although an impaired QoL is common in long-term follow ups.

11 November 2019 in Cancers
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BDBozenna Dembowska-Baginska
Bozenna Dembowska-Baginska
JWJolanta Więckowska
Jolanta Więckowska
ABAgnieszka Brozyna
Agnieszka Brozyna
EŚEwa Święszkowska
Ewa Święszkowska
HIHor Ismail
Hor Ismail
PKPiotr Kaliciński
Piotr Kaliciński
The aim of this study was to evaluate the health status of children cured from hepatoblastoma. Forty-five patients with hepatoblastoma treated between 1996–2014 were assessed. The recorded data included sex, age at diagnosis, disease stage, treatment methods, time since diagnosis, and the evaluation of health status domains which included performance status, growth development, hearing, cardiovascular, skeletal, gastrointestinal, genitourinary, neurological, and hematological function. There were 30 boys and 15 girls. The age at diagnosis ranged from one month to 14 years (median one year). At the time of the health status evaluation, the youngest patient was 5.5 years old and the oldest was 21 years of age (median—10 years). All patients were treated according to the Childhood Liver Tumors Strategy Group—SIOPEL recommendations, though they were not active participants of the studies. The median cumulative dose of cisplatin was 520 mg/m2 and 360 mg/m2 for doxorubicin. Thirty-six patients underwent partial hepatectomy, and nine total hepatectomy and liver transplantation. At a median of nine years from diagnosis, 68% of hepatoblastoma survivors had experienced at least one chronic health condition of any grade. The most frequent late complication was ototoxicity (28.8%), and the most serious were second malignancies (6.6%) and cardiomyopathy (4.4%). Conclusion: Survivors of hepatoblastoma are at risk for long-term complications. They require long-term monitoring for late effects.

14 February 2023 in Children
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AKAdam Kowalski
Adam Kowalski
GKGrzegorz Kowalewski
Grzegorz Kowalewski
PKPiotr Kaliciński
Piotr Kaliciński
KPKatarzyna Pankowska-Woźniak
Katarzyna Pankowska-Woźniak
MSMarek Szymczak
Marek Szymczak
MSMarek Stefanowicz
Marek Stefanowicz
A choledochal cyst is a rare malformation primarily diagnosed in children. The only effective therapy remains surgical cyst resection followed by Roux-en-Y hepaticojejunostomy. Treating asymptomatic neonates remains a point of discussion. Between 1984 and 2021, we performed choledochal cyst (CC) excision in 256 children at our center. Out of this group, we retrospectively reviewed the medical records of 59 patients who were operated on under one year of age. Follow-up ranged from 0.3 to 18 years (median 3.9 years). The preoperative course was asymptomatic in 22 (38%), while 37 patients (62%) had symptoms before surgery. The late postoperative course was uneventful in 45 patients (76%). In symptomatic patients, 16% had late complications, while in asymptomatic patients, only 4%. Late complications were observed in the laparotomy group in seven patients (17%). We did not observe late complications in the laparoscopy group. Early surgical intervention is not followed by a high risk of complications and may prevent the onset of preoperative complications, giving excellent early and long-term results, especially after minimally invasive laparoscopic surgery.

6 July 2021 in Children
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Journal Article
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MSMarek Stefanowicz
Marek Stefanowicz
GKGrzegorz Kowalewski
Grzegorz Kowalewski
MSMarek Szymczak
Marek Szymczak
WPWaldemar Patkowski
Waldemar Patkowski
KZKrzysztof Zieniewicz
Krzysztof Zieniewicz
PKPiotr Kaliciński
Piotr Kaliciński
We aimed to assess the impact of the graft-recipient weight ratio (GRWR) on early post-transplant complications and patient survival rates in children after living donor liver transplantation (LDLT). We retrospectively analyzed 321 patients who underwent LDLT from 2004 to 2019. The recipients were categorized into four groups: 37 patients had a GRWR ≤ 1.5% (Group A), 196 patients had a GRWR > 1.5% and ≤3.5% (Group B), 73 patients had a GRWR > 3.5% and 3.5%. Recipients with a GRWR < 5% had a significantly better prognosis concerning patients and graft survival. Using grafts with a GRWR < 5% allows us to expand the donor pool and decrease the risk of mortality while on the waiting list, when patients at the time of transplantation have less advanced liver disease. LDLT with a GRWR ≥ 5% is related to a higher risk of poor outcome, and thus should be an option for treating selected patients when the risk of a delayed transplantation is high and access to deceased donors is limited.

9 February 2023 in Children
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Journal Article
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MSMarek Stefanowicz
Marek Stefanowicz
PKPiotr Kaliciński
Piotr Kaliciński
GKGrzegorz Kowalewski
Grzegorz Kowalewski
AKAdam Kowalski
Adam Kowalski
MCMateusz Ciopinski
Mateusz Ciopinski
HIHor Ismail
Hor Ismail
The aim of our study was to assess risk factors for hepatic artery thrombosis (HAT) and to evaluate the impact of HAT management on long-term outcomes after pediatric living donor liver transplantation (LDLT). We retrospectively analyzed 400 patients who underwent primary LDLT between 1999 and 2020. We compared preoperative data, surgical factors, complications, and patient and graft survivals in patients with HAT (HAT Group) and without HAT (non-HAT Group). A total of 27 patients (6.75%) developed HAT. Acute liver failure, a hepatic artery (HA) anastomosis diameter below 2 mm, and intraoperative HA flow dysfunction were significantly more common in the HAT Group (p < 0.05, p = 0.02026, and p = 0.0019, respectively). In the HAT Group, 21 patients (77.8%) underwent urgent surgical revision. The incidence of biliary stenosis and retransplantation was significantly higher in the HAT Group (p = 0.00002 and p < 0.0001, respectively). Patient and graft survivals were significantly worse in the HAT Group (p < 0.05). The close monitoring of HA flow with Doppler ultrasound during the critical period of 2 to 3 weeks after LDLT and the immediate attempt of surgical revascularization may attenuate the elevated risk of biliary stenosis, graft loss, and the need for retransplantation due to HAT.

29 August 2021 in Children
Verified
Journal Article
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MSMarek Stefanowicz
Marek Stefanowicz
MJMaria Janowska
Maria Janowska
JPJoanna Pawłowska
Joanna Pawłowska
ATAnna Tylki-Szymanska
Anna Tylki-Szymanska
AKAdam Kowalski
Adam Kowalski
IJIrena Jankowska
Irena Jankowska
Transaldolase deficiency (TALDO; OMIM 606003) is a rare inborn autosomal-recessive error of the pentose phosphate pathway. It is an early-onset multisystem disease with dysmorphic features, anaemia, coagulopathy, thrombocytopenia, tubulopathy, hepatosplenomegaly and end-stage liver disease. We present a case of two Polish brothers, born to consanguineous parents, with early-onset TALDO. The dominant feature of disease was an early severe liver injury, with subsequent renal tubulopathy. Nodular liver fibrosis developed in the course of the underlying disease. The older brother presented stable liver function, however, he was qualified for deceased donor liver transplantation (DDLT) because of a liver tumour and suspicion of hepatocarcinoma. The boy was transplanted at the age of 14. The younger brother was qualified for DDLT due to end-stage liver disease and transplanted at the age of 11. Currently, both our patients are alive and in a good condition with normal graft function 23 and 20 months after DDLT respectively. Liver transplantation can be a therapeutic option in TALDO and should be considered in patients with coexisting severe chronic and end-stage liver disease. Long term follow-up is necessary to assess the impact of liver transplantation for quality of life, survival time and the course of the disease.