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Guideline
Infection
Recommendation for use of 15- and 20-valent pneumococcal conjugate vaccines in Korean infants and children
Ki Wook Yun, Dong Hyun Kim, Jong Gyun Ahn, Byung-Wook Eun, Jin Lee, Jina Lee, Taek-Jin Lee, Hyunju Lee, Dae Sun Jo, Eun Young Cho, Hye-Kyung Cho, Soo-Han Choi, Young June Choe, Ui Yoon Choi, Yun-Kyung Kim; The Committee on Infectious Diseases of the Korean Pediatric Society
Clin Exp Pediatr. 2026;69(1):76-83.   Published online December 30, 2025
Compared to PCV13, PCV15 includes 2 (22F and 33F), and PCV20 includes 7 (8, 10A, 11A, 12F, 15B, 22F, and 33F) additional serotypes. The vaccination schedule remains the same: primary doses at 2, 4, and 6 months, and a booster at 12–15 months. If PCV13 was administered in the primary series, PCV15 and PCV20 may be used to complete it or as a booster.
Original Article
General Pediatrics
Lipoprotein(a) prevalence trends in Portuguese children and adolescents: a real-world perspective
Isabel Morais Ribeiro, Susete Vieira, Miguel Saraiva, Mónica Tavares, José Carlos Oliveira, Isabel Mangas Palma, Helena Ferreira Mansilha
Clin Exp Pediatr. 2025;68(12):1031-1040.   Published online November 24, 2025
Early lipid screening, including lipoprotein(a) (Lp(a)), in children/adolescents is key to identifying and managing dyslipidemia and reducing the risk of early-onset cardiovascular disease. This study shows that prevalence of elevated Lp(a) in high-risk Portuguese children is alarming, with over 30% at intermediate/high risk and nearly 1% at very high-risk (>430 nmol/L). Since Lp(a) is mostly genetically determined, one-time early screening in atrisk children is crucial for timely monitoring and prevention.
Review Article
Oncology
Breaking the barrier: a guidelines-based review of antiangiogenesis drug resistance in pediatric cancer therapy
Nader Shakibazad, Mahdi Shahriari, Mani Ramzi
Clin Exp Pediatr. 2025;68(12):952-962.   Published online November 24, 2025
Antiangiogenic therapy resistance in pediatric cancers involves alternative angiogenic pathways, microenvironmental support, hypoxia-driven signaling, metabolic reprogramming, and structural adaptations such as vascular co-option. Metabolic adaptation highlights tumor plasticity. Effective treatments combine immunotherapy with biomarkers. To address vascular endothelial growth factor limitations, emerging targets include hypoxia-inducible factor-2α, endoglin, CXCR4, angiopoietin/Tie2, and bispecific antibodies. In resource-constrained settings, the guidelines recommend low-dose chemotherapy plus oral multiantiangiogenic agents to ensure improved accessibility and treatment outcomes.
Original Article
Other
Comparing ethyl chloride and 10% lignocaine spray for pediatric intravenous cannulation pain relief
Susmitha Vellanki, Malavika Kulkarni, H.D. Arun Kumar, Deepali Shetty, Nikhil Karthik B, Mathew Tom
Clin Exp Pediatr. 2026;69(1):65-72.   Published online November 21, 2025
Background: Intravenous cannulation (IVC) is a routine yet distressing procedure in pediatric patients, often provoking significant anxiety and procedural pain. Although eutectic mixtures such as eutectic mixture of local anesthetic cream are widely used, their delayed onset limits their applicability in time-sensitive settings. Ethyl chloride vapocoolant spray and 10% lignocaine spray have been proposed as rapid-onset alternatives, yet direct comparative...
Bifidobacterium animalis subsp. lactis BLa80 for preventing allergic, respiratory, and gastrointestinal diseases in young children in China: a randomized double-blind placebo-controlled trial
ke Chen, xi Zhang, Kaihong Zeng, Jiayi Zhong, Shanshan Jin, Yang Nie, Ping Yang, Nianyang He, Haixia Chen, Yanmei Cao, Yunrong Fu, Ziji Fang, Wei Jiang, Changqi Liu
Background: Respiratory, gastrointestinal, and allergic diseases can significantly affect children’s physical and mental health and quality of life.
Purpose: This study aimed to assess the safety of Bifidobacterium animalis subsp. lactis BLa80, its preventive effects on morbidities related to respiratory, gastrointestinal, and allergic diseases, and its impact on the gut microbiome of children during the study period. Methods: Healthy children aged 0–3...
Infection
Association between vitamin D polymorphisms and binding protein and COVID-19 risk and severity in children
Victoria Giatraki, Helen Dimitriou, Georgia Martimianaki, Christos Tsatsanis, Emmanouil Galanakis, Chrysoula Perdikogianni
Clin Exp Pediatr. 2025;68(12):998-1006.   Published online October 22, 2025
Question: Addressing crucial genetic variants within the vitamin D pathway and coronavirus disease 2019 (COVID-19) susceptibility, the vitamin D receptor, vitamin D binding protein, and CYP27B1-1260 polmorphisms might be associated with COVID-19 occurrence and severity in children.
Finding: The FokI FF genotype might be an independent risk factor for COVID-19 severity in childhood.
Meaning: This research may further elucidate genetic susceptibility to multisystem viral infections and establish genetic markers for severe clinical outcomes.
Basic Research
Linezolid mitigates tissue injury in experimental model of pediatric testicular torsion: TLR-4/MAPK/NF-κB involvement
Moein Ghasemi, Abolfazl Basiri, Houman Kazemzadeh, Mohammad Amin Manavi, Seyed Mohammad Tavangar, Ahmad Reza Dehpour, Hamed Shafaroodi
Clin Exp Pediatr. 2025;68(9):700-711.   Published online August 26, 2025
Question: What pharmacological strategies can limit ischemia-reperfusion injury in pediatric patients with testicular torsion?
Finding: In a rat model of testicular torsion, linezolid reduced oxidative stress, inflammation, and tissue injury via the Toll-like receptor 4/mitogen-activated protein kinase/nuclear factor kappa beta pathway.
Meaning: Linezolid may offer a pharmacological approach to attenuate testicular damage in pediatric patients with testicular torsion, warranting further clinical investigation.
Hematology
Evaluation of Bak and Bcl-Xl gene expression among pediatric patients with acute primary immune thrombocytopenia
Amira Zaki Badawy, Samia Hassan Kandel, Iman Aly Ahmedy, Mahmoud Ahmed Elhawy, Sally Mohamed El-Hefnawy, Dina Fouad Sief El-Nasr Zidan, Hanan Hassan El-sheity
Clin Exp Pediatr. 2025;68(11):901-908.   Published online August 6, 2025
The B-cell lymphoma protein 2 family proteins Bak and Bcl- Xl, important markers of apoptosis, may contribute to primary immune thrombocytopenia (ITP). Thus, their expression may serve as biomarkers for the diagnosis and monitoring of pediatric ITP. Targeting these pathways may improve platelet survival, particularly in treatment-resistant cases. Personalized treatments based on apoptotic profiles can optimize therapy and reduce the unnecessary use of immunosuppressive drugs.
Cardiology
Unsustainable and overworked: unpacking the challenges faced by pediatric cardiologists and cardiac surgeons in Korea
Soo In Jeong, GI Beom Kim, Sung Hye Kim, Jae Yoon Na, Hong Ju Shin, Sin Weon Yun, Lucy Youngmin Eun, Sang Yun Lee, Chang-Ha Lee, Kwang Ho Choi, Seul Gi Cha, Mi Young Han
Clin Exp Pediatr. 2025;68(9):732-741.   Published online August 6, 2025
Question: What are the key challenges affecting pediatric cardiologists and cardiac surgeons in Korea?
Finding: Excessive workloads, low procedural volumes, and legal risks contribute to high burnout. Regional disparities limit skill maintenance and threaten workforce sustainability.
Meaning: Targeted policies ensuring fair workloads, legal protections, and regional support are essential to stabilizing the pediatric cardiac workforce and maintaining high-quality care.
Critical Care Medicine
Effect of postoperative enteral protein supplementation on nitrogen balance in critically ill children
Irene Yuniar, Kadek Apik Lestari, Antonius Hocky Pudjiadi, Fatima Safira Alatas, Yoga Devaera
Clin Exp Pediatr. 2025;68(10):790-800.   Published online May 30, 2025
Question: Does high-protein enteral nutrition better increase the average nitrogen balance (NB) and decrease the intestinal fatty acid-binding protein (I-FABP) level of critically ill postoperative children than standard-protein enteral nutrition?
Finding: The study demonstrated a significant increase in average NB but no significant decrease in I-FABP levels in the high- versus low-protein group.
Meaning: These findings suggest that high-protein enteral nutrition can improve NB in critically ill postoperative children, thereby supporting their recovery.
Gastroenterology
Adenosine deaminase and interleukin-1 receptor antagonist genetic polymorphisms among obese children with versus without metabolic dysfunction-associated fatty liver disease
Hala M. Sakhr, Mohammed H. Hassan, Azza Mohamed Taha, Ali Helmi Bakri
Clin Exp Pediatr. 2025;68(10):808-818.   Published online May 29, 2025
Question: Is there an association between adenosine deaminase (ADA) G22A and interleukin-1 receptor antagonist (IL-1RN) genetic polymorphisms and pediatric metabolic dysfunction-associated fatty liver disease (MAFLD)?
Finding: The GG genotype and G allele of ADA G22A were significantly associated with obesity but not pediatric MAFLD, while the *1/*2 genotype of the IL-1RN gene was significantly associated with obesity and pediatric MAFLD.
Meaning: The IL-1RN gene may contribute to pediatric MAFLD.
Critical Care Medicine
Serum amyloid A and proadrenomedullin as early markers in critically ill children with sepsis
Nagwan Y. Saleh, Wafaa M. Abo El Fotoh, Mona S. Habib, Salem E. Deraz
Clin Exp Pediatr. 2025;68(8):578-586.   Published online February 26, 2025
Question: Are serum amyloid A (SAA) and proadrenomedullin (proADM) levels early markers in critically ill children with sepsis?
Finding: This prospective case-control study included 65 critically ill children with sepsis admitted to the pediatric intensive care unit and 31 controls. SAA and proADM levels were significantly higher in patients versus controls.
Meaning: SAA and proADM are promising biomarkers for diagnosing and predicting outcomes in pediatric sepsis.
Nutrition
Differential effects of dietary and physical activity interventions on adiposity of children with obesity
Anekchoke Tangtongsoong, Chonnikant Visuthranukul, Yuda Chongpison, Sirinuch Chomtho
Clin Exp Pediatr. 2025;68(5):370-378.   Published online February 3, 2025
Question: How do dietary intake and physical activity affect body mass index (BMI) z scores and adiposity among children with obesity?
Finding: Higher dietary protein and fiber intakes were significantly associated with a decrease in BMI z scores and adiposity among children with obesity.
Meaning: Optimizing dietary interventions by focusing on protein and fiber intakes could be an effective strategy for managing childhood obesity.
Oncology
Prognostic role of mid-regional pro-adrenomedullin in predicting infection in pediatric cancer with febrile neutropenia
Seham M. Ragab, Sara Mahmoud El-Deeb, Ahmed Saeed, Asmaa A. Mahmoud
Clin Exp Pediatr. 2025;68(6):445-453.   Published online January 13, 2025
· Infection remains a leading cause of death in febrile neutropenia (FN).
· Mid-regional pro-adrenomedullin (MR-ProADM) levels are higher among patients with FN and a bacterial infection.
· A longer FN duration and hospital stay length as well as elevated C-reactive protein, procalcitonin, and MR-ProADM levels are significant risk factors for mortality.
Neonatology (Perinatology)
Differential roles of interleukin-6 and adrenomedullin in early diagnosis and mortality predictions in late-onset neonatal sepsis
Emilly Henrique dos Santos, Gabriel Acca Barreira, Mariana Okay Saippa, Maria Carolina Pires Cruz, Karen Alessandra Rodrigues, Ronaldo Arkader, Thelma Suely Okay
Clin Exp Pediatr. 2025;68(6):463-471.   Published online December 23, 2024
Question: Can adrenomedullin (ADM) or interleukin-6 (IL-6) detect late-onset neonatal sepsis (LOS) at admission (area under the curve [AUC]>0.90) as an early diagnostic marker?
Finding: Only IL-6 consistently distinguished survivors from nonsurvivors (AUC>0.90) on admission and antibiotic treatment days 3 and 7. C-reactive protein level identified infections from day 3 but failed to predict outcomes (AUC<0.70).
Meaning: IL-6 level can improve LOS diagnosis and prognosis.
Developmental and Behavioral Medicine
Characteristics of temper tantrums in 1–6-year-old children and impact on caregivers
Warangkana Prutipaisan, Issarapa Chunsuwan, Tippawan Hansakunachai, Paskorn Sritipsukho
Clin Exp Pediatr. 2025;68(2):170-177.   Published online November 13, 2024
Question: What are common tantrum behaviors in preschool children, and how frequently are problematic behaviors observed? Do problematic tantrums have a different emotional impact on caregivers compared to typical tantrums?
Finding: Temper tantrums are common in preschool children, and verbal tantrums are the most common type.
Meaning: Problematic tantrums, defined as tantrums exhibiting aggressive physical behavior, long duration (>15 minutes), or frequent occurrence (>3 days/wk), significantly affected caregivers’ emotions.
Endocrinology
Efficacy of leuprolide acetate versus triptorelin pamoate administered every 3 months for treatment of central precocious puberty
Thanaporn Thaneetrakool, Suphab Aroonparkmongkol, Nattakarn Numsriskulrat, Vichit Supornsilchai, Suttipong Wacharasindhu, Khomsak Srilanchakon
Clin Exp Pediatr. 2025;68(1):91-96.   Published online November 6, 2024
Question: What are the differences in efficacy between leuprolide acetate and triptorelin pamoate administered every 3 months for the treatment of central precocious puberty (CPP)?
Finding: There were no significant intergroup differences in luteinizing hormone suppression or predicted adult height at the end of treatment in girls with CPP.
Meaning: Leuprolide acetate and triptorelin pamoate have comparable efficacy for treating CPP.
General Pediatrics
Nonpharmacological interventions for managing postoperative pain and anxiety in children: a randomized controlled trial
Edlin Glane Mathias, Mamatha Shivananda Pai, Vijay Kumar, Dinesh Narayanakurup, Malavika Kulkarni, Vasudeva Guddattu, Ann-Cathrine Bramhagen, Baby S Nayak, Anice George
Clin Exp Pediatr. 2024;67(12):677-685.   Published online October 31, 2024
Question: What is the effect of nonpharmacological interventions on postoperative pain and anxiety among children.
Finding: Nurse-provided distraction interventions reduce pain and anxiety among pediatric surgical patients.
Meaning: The findings suggest that nonpharmacological interventions provided postoperatively to children reduce their pain and anxiety levels.
Allergy
Regional differences in diagnosis and management of cow's milk allergy
Fabian Hendricx, Emma Robert, Jaime A. Ramirez-Mayans, Karen Rubi Ignorosa Arellano, Erick M. Toro Monjaraz, Yvan Vandenplas
Clin Exp Pediatr. 2024;67(11):601-607.   Published online October 28, 2024
· Although there is broad consensus on many aspects regarding the symptoms, diagnosis, and treatment of cow's milk allergy, the impact of geographical, cultural, and socioeconomic factors remains unestablished.
· Availability and cost of formula for the management of cow's milk allergy have a major impact on the therapeutic choice.
· Region-specific guidelines for the treatment of cow's milk allergy are required.
Review Article
Infection
Incidence, causative organisms, and risk factors of bloodstream infections in pediatric liver transplant patients: a systematic review
Mohamad Shieb, Rand Hasanain, Zara Arshad, Faisal A. Nawaz, Rahul Kashyap, Eric J. Stern
Clin Exp Pediatr. 2024;67(9):427-434.   Published online April 5, 2024
The overall incidence of bloodstream infections was 23.5%. Gram-negative organisms occur at a much higher rate in pediatric liver transplant recipients then that the general pediatric population. However, when comparing pediatric and adult liver transplant recipients Gram-positive organisms occur with a much higher rate in the pediatric population highlighting the importance of early and broad spectrum antimicrobial coverage when bloodstream infections are suspected.
Original Article
Nutrition
Effect of probiotics plus zinc supplementation on clinical outcomes of infants and children with acute infectious diarrhea: a randomized controlled trial
Deldar Morad Abdulah, Saad Jbraeil Sulaiman, Zaid Waad Ahmed
Clin Exp Pediatr. 2024;67(4):203-212.   Published online February 19, 2024
Question: Does zinc supplementation along with probiotics affect disease severity or clinical outcomes of children with acute diarrhea?
Findings: This study indicated that zinc supplementation and probiotics had no effect on clinical improvement or disease severity among pediatric patients with acute diarrhea.
Meaning: Children who received probiotics plus zinc recovered faster than those who received probiotics only.
Developmental and Behavioral Medicine
Attention-deficit/hyperactive-impulsive disorder symptoms among grade 1 students with reading disorder in Thailand
Patcharapun Sarisuta, Issarapa Chunsuwan, Tippawan Hansakunachai, Paskorn Sritipsukho
Clin Exp Pediatr. 2023;66(11):485-492.   Published online October 24, 2023
Question: Would students with reading disorder have a significantly higher prevalence of attention-deficit/hyperactiveimpulsive disorder (ADHD) symptoms than neurotypical students?
Finding: Students at risk of reading disorder exhibited significant ADHD symptoms compared with those not at risk of reading disorder according to all presentations of teacher assessments versus only for predominantly inattentive presentations of the parental assessments.
Meaning: Students with reading disorder have a significantly higher prevalence of ADHD symptoms than neurotypical students. Sex, parental education level, average family income, and children’s school affiliation significantly influenced reading disorder prevalence.
Review Article
Allergy
Moderate to severe atopic dermatitis in children: focus on systemic Th2 cytokine receptor antagonists and Janus kinase inhibitors
Jeong Hee Kim, Mona Salem Samra
Clin Exp Pediatr. 2024;67(2):64-79.   Published online June 14, 2023
· Atopic dermatitis (AD) is characterized by a strong T helper (Th)2 response, although the extents of Th22, Th17/ interleukin (IL)-23, and Th1 responses vary among disease subtypes.
· Children with moderate to severe AD may require early systemic therapy to reduce the systemic inflammation caused by increased Th2 cytokine levels.
· Dupilumab, which blocks IL-4/IL-13 receptor, has equivalent efficacy for extrinsic and intrinsic AD and a favorable safety profile in infants and children aged 6 months and older.
Infection
COVID-19 in immunocompromised children and adolescents
Byung Ok Kwak, Byung Wook Eun
Clin Exp Pediatr. 2023;66(5):182-189.   Published online April 18, 2023
Most immunocompromised children and adolescents are not at increased risk of developing severe coronavirus disease 2019 (COVID-19). COVID-19 outcomes for low- or medium-risk immunocompromised children are favorable, while more serious illness reportedly occurs in high-risk immunocompromised children by underlying disease, its treatments, and other factors. Therefore, the early detection and timely management of severe COVID-19 and treatment of underlying disease are important. Hospitalization and COVID-19 vaccination should be carefully considered.
Original Article
Hematology
Changes and correlations of T-cell coinhibitory molecule programmed death-1 and interferon-γ in pediatric immune thrombocytopenia
Fady Mohamed El-Gendy, Amira M.F. Shehata, Esam Awad Abd El-Kawy, Mahmoud Ahmed El-Hawy
Clin Exp Pediatr. 2023;66(3):127-133.   Published online February 24, 2023
Question: What are the PD-1+ CD4+ T cells percentages and serum interferon gamma (IFN-γ) levels of pediatric patients with immune thrombocytopenia (ITP)?
Finding: Compared with healthy controls, the PD-1+ CD4+ T cells percentages and IFN-γ levels were significantly higher in ITP patients before and 1 month after therapy.
Meaning: Our findings suggest that PD-1+ CD4+ T cells and IFN-γ are involved in the pathophysiological process of ITP.
Infection
Seroprevalence of maternal peripartum human T-cell lymphotropic virus type-1 infection: a systematic review and meta-analysis of the Nigerian literature
Abdulrasheed Usman, Muhammad Hamis Musa, Bukhari Isah Shuaib, Olayemi Balogun, Mukhtar Adeiza
Clin Exp Pediatr. 2023;66(7):307-316.   Published online December 22, 2022
The peripartum period is an important transmission time for human T-cell lymphotropic virus-1 (HTLV-1) infection, mainly via breastfeeding and partly through the placental tissues of carrier mothers. Although most HTLV-1–infected individuals are asymptomatic, fetal and childhood infections often result in several diseases with disappointing treatment outcomes. An estimated HTLV-1 burden in Nigeria among perinatal women must be determined to enable rational planning of a comprehensive health care intervention.
Review Article
Infection
Global varicella vaccination programs
Young Hwa Lee, Young June Choe, Jia Lee, Eunseong Kim, Jae Young Lee, Kwan Hong, Yoonsun Yoon, Yun-Kyung Kim
Clin Exp Pediatr. 2022;65(12):555-562.   Published online November 2, 2022
It is important to evaluate its effectiveness at the national level and to determine the varicella vaccine schedule based on the evidence generated through the studies.
Nutrition
Protein substitutions as new-generation pharmanutrition approach to managing phenylketonuria
Fatma Nur Keskin, Teslime Özge Şahin, Raffaele Capasso, Duygu Ağagündüz
Clin Exp Pediatr. 2023;66(8):320-331.   Published online November 1, 2022
Phenylketonuria, an autosomal recessive disease that results from the inability to metabolize phenylalanine, is currently treated with medical nutrition therapy. New treatment approaches such as tetrahydrobiopterin, glycomacropeptide, large neutral amino acids, pegvaliase, and gene therapy significantly impact disease management and dietary enrichment. This article also reviews animal and human studies that have evaluated the efficacy and safety of these new protein substitutes.
Original Article
Gastroenterology
Ability of polymicrobial probiotic and mono-strain probiotic to reduce functional abdominal pain in children: a randomized clinical trial
Seyed Sajad Jafari, Seyed Mojtaba Hashemi, Bahman Sadeghi, Amir Almasi-Hashiani
Clin Exp Pediatr. 2022;65(12):589-594.   Published online October 31, 2022
· This study compared the ability of 2 probiotics to reduce and improve functional abdominal pain (FAP) in children.
· In the polymicrobial probiotic (PMP) group, 10.34% of children reported no pain; in the mono-strain probiotic (MSP) group, all patients reported low-degree pain. The mean pain score decreased significantly over time in both groups.
· The use of both PMP and MSP is recommended to reduce pain in patients with FAP.
Review Article
Gastroenterology
High-resolution esophageal manometry in children
Yogesh Waikar
Clin Exp Pediatr. 2023;66(4):155-160.   Published online October 17, 2022
High-resolution esophageal manometry can be safely performed in children where recurrent vomiting and persistent dysphagia is the working diagnosis after excluding nonluminal and structural obstructive pathologies using pediatric upper gastrointestinal endoscopy. Normal manometry values are available. Clinical picture, biochemical tests, radiological interpretation, and endoscopic findings with manometry completes the analysis of patients with recurrent vomiting and dysphagia.


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