{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T22:41:02Z","timestamp":1791326462021,"version":"4.3.1"},"reference-count":67,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2026,5,25]],"date-time":"2026-05-25T00:00:00Z","timestamp":1779667200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Hypoxia is one of the most important factors limiting the effectiveness of modern anticancer therapies, particularly photodynamic therapy (PDT). The hypoxia of the tumor microenvironment results from abnormal angiogenesis and the high metabolic demand of cancer cells, which leads to reduced oxygen availability necessary for generating reactive oxygen species (ROS). Consequently, conventional therapeutic approaches, mainly based on the type II PDT mechanism, show limited effectiveness under hypoxic conditions. In response to these limitations, strategies are being developed to increase oxygen availability within the tumor. Of particular importance are nanocarriers based on perfluorocarbons (PFCs), which, due to their high gas solubility, can effectively transport and release oxygen in the tumor microenvironment. Research indicates that the use of such systems leads to improved PDT efficiency by increasing the production of singlet oxygen and enhancing cancer cell damage. Parallelly, alternative approaches independent of high oxygen concentration, including type I photosensitizers, are being developed. Unlike classical type II mechanisms, they generate free radicals through electron transfer reactions, which allows effective action even under conditions of significant hypoxia. This approach significantly expands the possibilities of using PDT in the treatment of tumors with low oxygen levels. Current research directions focus on integrating various therapeutic strategies to achieve a synergistic effect. Hybrid systems combining oxygen delivery (e.g., using PFCs) with the use of type I photosensitizers and other treatment methods, such as chemotherapy or immunotherapy, show the greatest clinical potential. Such multifunctional approaches simultaneously allow improving tumor oxygenation and increasing the efficiency of ROS generation, which makes them a promising strategy for the future of anticancer therapies.<\/jats:p>","DOI":"10.3390\/ijms27114748","type":"journal-article","created":{"date-parts":[[2026,5,25]],"date-time":"2026-05-25T14:10:22Z","timestamp":1779718222000},"page":"4748","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Overcoming Tumor Hypoxia in Photodynamic Therapy: A Comprehensive Review of Oxygen-Delivery Carriers and Type I Photosensitizers"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5557-5464","authenticated-orcid":false,"given":"Dorota","family":"Bartusik-Aebisher","sequence":"first","affiliation":[{"name":"Department of Biochemistry and General Chemistry, Faculty of Medicine, Collegium Medicum, University of Rzesz\u00f3w, 35-959 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Izabela","family":"Rudy","sequence":"additional","affiliation":[{"name":"Student Scientific Club of Biochemists URCell, Department of Biochemistry and General Chemistry, Faculty of Medicine, Collegium Medicum, University of Rzesz\u00f3w, 35-959 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-7999-3449","authenticated-orcid":false,"given":"Kacper","family":"Rog\u00f3\u017c","sequence":"additional","affiliation":[{"name":"Student Scientific Club of Biochemists URCell, Department of Biochemistry and General Chemistry, Faculty of Medicine, Collegium Medicum, University of Rzesz\u00f3w, 35-959 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jakub","family":"Szpara","sequence":"additional","affiliation":[{"name":"Student Scientific Club of Biochemists URCell, Department of Biochemistry and General Chemistry, Faculty of Medicine, Collegium Medicum, University of Rzesz\u00f3w, 35-959 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandra","family":"Kawczyk-Krupka","sequence":"additional","affiliation":[{"name":"Department of Internal Diseases, Angiology and Physical Medicine, Center for Laser Diagnostics and Therapy, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2661-6570","authenticated-orcid":false,"given":"David","family":"Aebisher","sequence":"additional","affiliation":[{"name":"Department of Photomedicine and Physical Chemistry, Medical College, University of Rzesz\u00f3w, 35-959 Rzesz\u00f3w, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,5,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1007\/s40336-017-0231-1","article-title":"Molecular mechanisms of hypoxia in cancer","volume":"5","author":"Challapalli","year":"2017","journal-title":"Clin. 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