1. Effect of bleomycin hydrolase expression in tumor tissue on the therapeutic effectiveness of electrochemotherapyJan Bogataj, Urša Lampreht Tratar, Gregor Serša, Maja Čemažar, Aleš Grošelj, Maša Omerzel, 2025, izvirni znanstveni članek Povzetek: Electrochemotherapy (ECT) is a cancer treatment that combines application of short electrical pulses with chemotherapy drugs to improve their delivery into tumor cells. Bleomycin is one of the most effective drugs used in ECT, but its success can vary depending on the tumor type. One possible reason is the presence of bleomycin hydrolase (BLMH), an enzyme that inactivates bleomycin. In this study, we measured BLMH levels in different mouse tumor cell lines and tumors grown in animals. Thereafter we compared the levels of BLMH with tumor response to ECT and found a correlation with BLMH content, i.e., tumors with higher BLMH content responded poorly. These findings suggest that levels of BLMH could serve as a predictive marker for ECT effectiveness. Testing for BLMH before treatment may help personalize therapy and identify patients most likely to benefit from ECT. Ključne besede: electrochemotherapy, bleomycin hydrolase, predictive biomarker, murine models Objavljeno v DiRROS: 20.04.2026; Ogledov: 140; Prenosov: 103
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2. Phase I trial of phIL12 plasmid intratumoral gene electrotransfer in patients with basal cell carcinoma in head and neck regionPrimož Strojan, Tanja Jesenko, Maša Omerzel, Črt Jamšek, Aleš Grošelj, Urša Lampreht Tratar, Boštjan Markelc, Gorana Gašljević, Alojz Ihan, Franc Smrekar, Matjaž Peterka, Maja Čemažar, Gregor Serša, 2025, izvirni znanstveni članek Ključne besede: phase I clinical trial, phIL12 plasmid, interleukin-12, gene electrotransfer, basal cell carcinoma Objavljeno v DiRROS: 13.04.2026; Ogledov: 150; Prenosov: 109
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3. Bleomycin electrosclerotherapy (BEST) : mechanistic parallels to electrochemotherapy, experimental models, and unresolved questionsBarbara Lisec, Maja Čemažar, Tobian Muir, Maša Omerzel, Tanja Jesenko, Boštjan Markelc, Aleš Grošelj, Rok Dežman, Miha Štabuc, Dimitrij Kuhelj, Gregor Serša, 2026, pregledni znanstveni članek Ključne besede: vascular malformations, bleomycin electrosclerotherapy, BEST, electrochemotherapy Objavljeno v DiRROS: 01.04.2026; Ogledov: 232; Prenosov: 127
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4. Skin lesion classification in head and neck cancers using tissue index images derived from hyperspectral imagingDoruntina Hoxha, Aljoša Krt, Jošt Stergar, Tadej Tomanič, Aleš Grošelj, Ivan Štajduhar, Gregor Serša, Matija Milanič, 2025, izvirni znanstveni članek Ključne besede: medical physics, hyperspectral imaging, tissue index images, tumors, machine learning Objavljeno v DiRROS: 18.02.2026; Ogledov: 439; Prenosov: 204
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5. Induction chemotherapy and concurrent chemoradiotherapy for larynx preservation in laryngeal and hypopharyngeal cancerPrimož Strojan, Gaber Plavc, Robert Šifrer, Simona Jereb, Boštjan Lanišnik, Marko Kokalj, Aleš Grošelj, Cvetka Grašič-Kuhar, 2025, izvirni znanstveni članek Povzetek: To test the hypothesis that clinical tumor response after a single cycle of induction chemotherapy (ICT) can reliably differentiate between chemo-/radiosensitive and resistant tumors in the larynx preservation setting. Patients and methods Treatment consisted of docetaxel/cisplatin/5-fluorouracil (TPF) ICT followed by concurrent chemoradiotherapy (cCRT) with weekly cisplatin. The response of the primary tumor was assessed by transnasal endoscopy after the first ICT cycle. Results 37/39 (95%) patients with laryngeal (46%) or hypopharyngeal (54%) carcinoma responded to one cycle of ICT, and two patients were referred for salvage surgery. Laryngectomy-free survival at 2 and 5 years was 87% and 75%, respectively. The corresponding rates for locoregional control (and also for disease-free survival) were 79% and 70% and for overall survival 92% and 82%. Conclusions Clinical assessment of tumor response to one cycle of TPF ICT serves as a valid and easy-to-use predictor of tumor sensitivity to platinum-based cCRT. Ključne besede: induction chemotherapy, chemoradiotherapy, arynx preservation Objavljeno v DiRROS: 16.01.2026; Ogledov: 344; Prenosov: 360
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6. The incidence of IgG4-related disease in Slovenia : single-centre experienceAlojzija Hočevar, Aleš Grošelj, Gregor Hawlina, Matic Koželj, Andrej Škoberne, Jože Pižem, Vesna Jurčić, 2025, izvirni znanstveni članek Povzetek: Background: Data on the incidence of IgG4-related disease (IgG4-RD) are scarce. Our aim was to determine the incidence of IgG4-RD in a well-defined region. Methods: This retrospective study covered the Ljubljana region over the period from January 2012 to December 2024. A review of cases diagnosed with IgG4-RD was performed at several departments of the University Medical Centre Ljubljana—an integrated secondary/tertiary university teaching hospital (rheumatology, nephrology, angiology, gastroenterology, abdominal surgery, ENT surgery, ophthalmology). While IgG4-RD cases at the Department of Rheumatology were collected prospectively, potential cases at other departments were retrieved by searching electronic medical database for the keyword “IgG4”. In addition, the Institute of Pathology, Faculty of Medicine, University of Ljubljana, provided a list of patients with histological features consistent with IgG4-RD. Year-specific incidence rates and an average incidence rate over the 13-year period were determined. Clinical features of patients were analysed. Results: During the observation period, 58 cases of IgG4-RD were diagnosed. Of these, 35 patients were residents of the Ljubljana region, which had an average adult population of 541,600. The estimated average annual incidence rate of IgG4-RD was 5.0 per million (95% confidence interval: 3.5; 6.9), with year-specific incidence rates fluctuating between 1.8 and 9.3 per million adults. The cases were stratified into four phenotypic categories: pancreato-hepato-biliary (17%), retroperitoneal fibrosis-aortitis (43%), head and neck-limited (14%), and Mikulicz syndrome with systemic involvement (26%). Conclusions: The average annual incidence rate of IgG4-RD was 5 per million adults, with the retroperitoneal fibrosis-aortitis phenotype predominating in our cohort. Ključne besede: IgG4-related disease, epidemiology, demographic, incidence rate Objavljeno v DiRROS: 09.12.2025; Ogledov: 551; Prenosov: 252
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7. Electrochemotherapy (ECT) in treatment of mucosal head and neck tumors : an international network for sharing practices on ECT (InspECT) study group reportGiulia Bertino, Marta Minuti, Aleš Grošelj, Črt Jamšek, Barbara Silvestri, Silvia Carpene, Paolo Matteucci, Giuseppe Riva, Giancarlo Pecorari, Matteo Mascherini, Gregor Serša, 2024, izvirni znanstveni članek Povzetek: The aim of this multicenter study was to evaluate the effectiveness and safety of electrochemotherapy (ECT) for the treatment of mucosal tumors in the head and neck. A total of 71 patients with 84 nodules of different histologies in the oral cavity, pharynx and larynx treated by ECT were evaluated. The data were collected from the InspECT database from 10 participating centers throughout Europe. Primary and recurrent/secondary tumors of different histologies were treated. The overall response rate was 65 %, with a 33 % complete response rate with limited side effects. The response rates of the primary and secondary tumors were not different. However, smaller tumors responded better than tumors larger than 3 cm in diameter. Furthermore, the tumors that were treated with curative intent responded significantly better than those treated with palliative intent. This study demonstrated the feasibility, safety and effectiveness of ECT in a larger cohort of patients with mucosal lesions in the head and neck region. Based on the available data, ECT can be used for the treatment of recurrent and, in some cases, primary mucosal tumors located in the oral cavity, larynx, and pharynx. A better response was obtained in patients with smaller primary tumors treated with curative intent. Ključne besede: electrochemotherapy, mucosal cancer, head cancer, neck cancer, ECT Objavljeno v DiRROS: 05.12.2025; Ogledov: 910; Prenosov: 293
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8. Gene therapy of rare diseases as a milestone in medicine : overview of the field and report on initial experiences in SloveniaUrh Grošelj, Marko Kavčič, Ana Drole Torkar, Jan Kafol, Duško Lainšček, Roman Jerala, Matjaž Sever, Samo Zver, Gregor Serša, Maja Čemažar, Primož Strojan, Aleš Grošelj, Mojca Žerjav-Tanšek, Špela Miroševič, Simona Ivančan, Tomaž Prelog, David Gosar, Jasna Oražem, Matej Mlinarič, Sara Bertok, Jernej Kovač, Jana Kodrič, Saba Battelino, Marko Pokorn, Alojz Ihan, Janez Jazbec, Tadej Battelino, Damjan Osredkar, 2025, pregledni znanstveni članek Povzetek: Gene therapy has transitioned from a long-awaited promise to a clinical reality, offering transformative treatments for rare congenital diseases and certain cancers, which have a significant impact on patients’ lives. Current approaches focus on gene replacement therapy, either in vivo or ex vivo, mostly utilizing viral vectors to deliver therapeutic genes into target cells. However, refining these techniques is essential to overcome challenges and complications associated with gene therapy to ensure long-term safety and efficacy. Slovenia has witnessed significant advancements in this field since 2018, marked by successful gene therapy trials and treatments for various rare diseases. Significant strides have been made in the field of gene therapy in Slovenia, treating patients with spinal muscular atrophy and rare metabolic disorders, including the pioneering work on CTNNB1 syndrome. Additionally, immune gene therapy, exemplified by IL-12 adjuvant therapy for cancer, has been a focus of research in Slovenia. Through patient-centred initiatives and international collaborations, researchers in Slovenia are advancing preclinical research and clinical trials, paving the way for accessible gene therapies. Establishing clinical infrastructure and genomic diagnostics for rare diseases is crucial for gene therapy implementation. Efforts in this regard in Slovenia, including the establishment of a Centre for Rare Diseases, Centre for the Technologies of Gene and Cell Therapy, and rapid genomic diagnostics, demonstrate a commitment to comprehensive patient care. Despite the promises of gene therapy, challenges remain, including cost, distribution, efficacy, and long-term safety. Collaborative efforts are essential to address these challenges and ensure equitable access to innovative therapies for patients with rare diseases. Ključne besede: gene therapy, rare genetic diseases, Slovenia, CAR-T cells, cancer, immune gene therapy Objavljeno v DiRROS: 04.12.2025; Ogledov: 526; Prenosov: 326
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9. Long-term outcomes of reduced-dose bleomycin in electrochemotherapy for basal cell carcinoma in elderly patientsAleš Grošelj, Črt Jamšek, Simona Kranjc Brezar, Maja Čemažar, Maša Omerzel, Luka Pušnik, Gregor Serša, 2025, izvirni znanstveni članek Povzetek: Electrochemotherapy (ECT) is a minimally invasive treatment option for basal cell carcinoma (BCC), which is particularly advantageous in the elderly population. This study evaluated the long-term effects of treating BCC in older patients using ECT with a reduced dose of bleomycin (10,000 IU/m2) and compared the results to patients who received the standard dose of bleomycin (15,000 IU/m2). The retrospective analysis included 116 patients aged over 65 years with 257 histologically confirmed BCCs. Tumors were treated with either the standard dose (n = 82) or the reduced dose (n = 175) of bleomycin. The results showed that the recurrence rate was comparable between the groups, particularly in the first year after treatment. The reduced-dose group exhibited a greater recurrence rate after the first year, which may be attributed to a weaker local immune response due to the de-escalated dose of bleomycin. Nonetheless, administering a standard bleomycin dosage as a salvage treatment in the event of recurrence proved highly effective. These findings suggest that ECT with a reduced bleomycin dose is a viable option for treating BCC in elderly patients, particularly those with shorter life expectancy. Ključne besede: bleomycin, electrochemotherapy, head and neck, nonmelanoma skin cancer Objavljeno v DiRROS: 25.11.2025; Ogledov: 687; Prenosov: 271
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10. Electrochemotherapy for basal cell carcinoma in the head and neck region : 5-year follow-up from the Insp-ECT registryAleš Grošelj, Giulia Bertino, Marta Minuti, James A. P. Clover, Camilla Kjaer Lonkvist, Erika Kis, Christian Kunte, Tobian Muir, Francesco Russano,, Francesca De Terlizzi, Joy Odili, Gregor Serša, 2025, izvirni znanstveni članek Povzetek: Basal cell carcinoma (BCC) is a cutaneous malignancy that typically appears in sun-exposed areas. We analyzed data from the Insp-ECT registry of all patients affected by BCC in the head and neck region. The aim of this study was to evaluate the safety and efficacy of electrochemotherapy (ECT) on a 5-year basis. Patients and methods A cohort of 132 patients was included. They were treated by ECT according to the current Standard Operating Procedures. The median age was 74 years (range 41–93). There was a median of 1 nodule per patient (range 1–7), and the median size of the lesions was 1.4 cm (range 0.5–5.0 cm). Results Patients tolerated ECT well, and 96% agreed to repeat it if needed. The side effects were mild and temporary. All patients achieved a complete clinical response after 1 to 3 ECT sessions. During the first year of follow-up, 4 (3%) patients experienced recurrence, which was treated (2 with ECT, 1 with surgery, and 1 with a combination of ECT and surgery), after which they remained free of disease until the end of follow-up at 5 years. Five patients reported recurrence thereafter and were treated according to their condition. At the 5-year follow-up, the disease-free survival (DFS) rate was 92% (95% confidence interval [CI]: 87%–96%). At that time, 3 patients were alive with disease (2%), and 124 patients were free of disease (98%). Conclusions This study shows the feasibility and efficacy of ECT treatment in elderly patients with BCC tumors in aesthetically and functionally sensitive areas, with negligible toxicity. Comparable efficacy to other treatment modalities was demonstrated at 1 year and 5 years of follow-up in terms of DFS. Ključne besede: basal cell carcinoma, electrochemotherapy, preživetje brez ponovitve bolezni Objavljeno v DiRROS: 25.11.2025; Ogledov: 666; Prenosov: 239
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