Radiosensitization treatment using hydrogen peroxide for inoperable rectal cancer

Area of Science:

• Oncology
• Radiotherapy
• Medical Chemistry

Background:

• Unresectable rectal cancer treatment is complex, with chemoradiation therapy as the primary approach.
• Radiosensitizers can improve local control and symptom relief by targeting tumor hypoxia.
• Evaluating novel radiosensitizing agents is crucial for enhancing treatment efficacy.

Purpose of the Study:

• To assess the feasibility and safety of radiosensitization using hydrogen peroxide with radiation therapy (RT) for unresectable rectal cancer.
• To determine the clinical outcomes, including adverse events and therapeutic effects, of this combined treatment modality.

Main Methods:

• A prospective study involving 13 patients with unresectable rectal cancer.
• Twice-weekly radiosensitization using 3% hydrogen peroxide-soaked gauze applied rectally during RT.
• Whole pelvis radiation therapy (45-65 Gy in 25-33 fractions) delivered over 5 days/week.
• Evaluation of acute and late adverse events at 1 and 6 months post-RT.

Main Results:

• The treatment was well-tolerated, with no acute grade 3 or worse adverse events.
• No patients experienced severe complications such as rectal fistula, necrosis, obstruction, or hemorrhage.
• All patients reported pain relief, hemostatic effects, and observed tumor shrinkage.

Conclusions:

• Rectal administration of hydrogen peroxide solution-soaked gauze appears to be a feasible and safe radiosensitizing option for unresectable rectal cancer.
• This approach shows potential for improving local control and symptomatic relief in patients with inoperable rectal tumors.
• Further research with larger cohorts and longer follow-up is warranted to confirm these findings.