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IRIDIUM-192 RADIOTHERAPY BENEFITS IN THE MANAGEMENT OF GYNECOLOGICAL TUMORS
V S Ivankova1, E A Domina2, T V Khrulenko1
1National Cancer Institute of the Ministry of Health of Ukraine, 33/43 Lomonosova St., Kyiv, 03022, Ukraine.
Problemy Radiatsiinoi Medytsyny Ta Radiobiolohii
|December 28, 2020
Summary
High dose-rate brachytherapy using Iridium-192 (192Ir) shows improved effectiveness over Cobalt-60 (60Co) for gynecological cancers. This advanced radiation therapy enhances tumor regression and reduces side effects, improving patient outcomes.
Area of Science:
- Radiation oncology
- Medical physics
- Gynecological oncology
Background:
- Advanced brachytherapy utilizing high dose-rate sources like Cobalt-60 (60Co) and Iridium-192 (192Ir) is crucial in gynecological cancer management.
- Optimizing dose distribution to the target while minimizing exposure to critical organs (bladder, rectum) remains a key challenge.
- Elaborating radiobiological criteria and understanding source properties are essential for reducing complications and improving quality of life.
Purpose of the Study:
- To compare the biological effects of 192Ir with 60Co gamma radiation.
- To enhance the effectiveness of brachytherapy through the use of 192Ir sources.
Main Methods:
- Radiobiological dosimetry was performed using peripheral blood lymphocytes from gynecological cancer patients.
- Cytogenetic analysis of radiation-induced chromosome aberrations was used to compare biological effects of 192Ir and 60Co.
- High dose-rate (HDR) brachytherapy was applied to patients with secondary vaginal cancer (n=98), with 192Ir in the study group (n=37) and 60Co in the control group (n=35).
Main Results:
- Dicentric chromosomes were the predominant radiation-induced damage markers.
- Individual sensitivity to 192Ir gamma irradiation was indicated by variable cytogenetic parameters in peripheral lymphocytes.
- Patients receiving 192Ir HDR brachytherapy showed improved treatment outcomes compared to the 60Co group.
Conclusions:
- HDR brachytherapy with both 192Ir and 60Co offers accurate dose distribution and minimizes radiation exposure to critical tissues, improving treatment results.
- 192Ir sources led to increased treatment throughput, enhanced tumor regression, and reduced radiation effects on critical organs compared to 60Co.
- Ongoing radiobiological studies and clinical trials aim to predict complications and personalize brachytherapy using 192Ir for improved patient care.
