KOLON Life Science
2026.02.19

▷ Single administration demonstrates meaningful tumor reduction and long-term inhibition in localized prostate cancer models
▷ Body weight remained stable during the study period, announcing superior results compared to standard-of-care
Kolon Life Science (CEO Sun-jin Kim) announced on February 9 that the preclinical research results for KLS-3021, its next-generation anticancer gene therapy candidate, have been officially accepted for publication in the international oncology journal Frontiers in Oncology (IF 3.3).
Frontiers in Oncology is an international peer-reviewed journal covering the comprehensive spectrum of cancer research, providing critical academic standards and scientific evidence across basic, preclinical, and clinical research to cancer researchers and medical professionals worldwide.
In this study, KLS-3021 induced a significant reduction in tumor size in localized prostate cancer with just a single administration within a prostate cancer animal model possessing clinical efficacy and relevance. It also demonstrated far superior tumor suppression effects compared to 'docetaxel', a current standard-of-care treatment. These findings are evaluated as preclinical evidence supporting the potential feasibility of KLS-3021 as an early image-guided, minimally invasive primary or adjuvant localized treatment for prostate cancer.
The research team evaluated the therapeutic efficacy in a prostate cancer orthotopic mouse model by dividing the subjects into three groups: a placebo group, a docetaxel-treated group, and a KLS-3021-treated group. The results showed that while the tumor bioluminescence (IVIS) signals were maintained or increased in the two control groups, the tumor signals completely disappeared or significantly decreased in the KLS-3021 group following a single administration. Notably, in a locally invasive model where lymph node metastasis was observed, tumor clearance was confirmed in both the primary lesion and the lymph nodes.
Furthermore, no weight loss was observed in the KLS-3021-treated group during the study period, indicating that KLS-3021 demonstrated good tolerability without systemic toxicity.
An official from Kolon Life Science stated, “Through this study, we have confirmed that KLS-3021 can achieve sustained tumor growth inhibition in a prostate cancer model with just a single dose. In particular, given that it demonstrated a superior and longer-lasting tumor suppression effect than docetaxel, which is used as a standard-of-care for localized prostate cancer, it has the potential to shift the prostate cancer treatment paradigm in the future.”
The official added, “As this preclinical evaluation confirmed that KLS-3021 controls not only the primary tumor but also lymph node metastasis, we expect it to deliver therapeutic benefits against remote metastatic lesions by inducing a systemic immune response in future clinical trials.”
KLS-3021 is a next-generation gene therapy that loads therapeutic genes (PH-20, IL-12, and sPD1-Fc) onto a recombinant vaccinia virus engineered for enhanced cancer cell selectivity. It features a significantly boosted anticancer efficacy by combining the virus's direct oncolytic (cell-killing) capability with the power to control cancer through immune cell activation.
Sun-jin Kim, CEO of Kolon Life Science, remarked, “KLS-3021 represents a novel localized treatment strategy for prostate cancer and a candidate expected to be effective against remote metastatic lesions, which will lead a significant paradigm shift in prostate cancer treatment. It holds the promise of providing new benefits to many patients who are currently undergoing active surveillance without active treatment due to medical or sub-medical reasons.”
He further emphasized, “The acceptance of this paper is an important indicator that objectively validates the innovativeness and global competitiveness of KLS-3021. Moving forward, we plan to aggressively strengthen our R&D as a next-generation oncolytic virus pipeline by expanding its indications to various solid tumors.”
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