Hyperbaric oxygenation for tumour sensitisation to radiotherapy

Area of Science:

• Oncology
• Radiotherapy
• Hyperbaric Medicine

Background:

• Radiotherapy is a common cancer treatment.
• Hyperbaric oxygen (HBO) may enhance radiotherapy by targeting hypoxic cancer cells.
• Combining HBO with radiotherapy could potentially reduce mortality and tumor recurrence.

Purpose of the Study:

• To evaluate the benefits and harms of using radiotherapy concurrently with HBO.
• To assess the impact of HBO on cancer treatment outcomes.

Main Methods:

• Systematic review and meta-analysis of randomized and quasi-randomized controlled trials.
• Searched multiple databases including CENTRAL, MEDLINE, EMBASE, CINAHL, and DORCTHIM up to November 2004.
• Independent data extraction and quality assessment by three reviewers.

Main Results:

• Nineteen trials involving 2286 patients were analyzed.
• HBO showed a reduction in mortality for head and neck cancers (1-year and 5-year) and improved local tumor control.
• HBO reduced local tumor recurrence in head and neck and uterine cervix cancers, but was associated with increased severe radiation tissue injury and seizures.

Conclusions:

• HBO shows evidence of improving local tumor control and reducing mortality/recurrence for specific cancers (head and neck, uterine cervix).
• Benefits may be linked to specific fractionation schemes, and significant adverse effects (tissue injury, seizures) are noted.
• Further research is needed for head and neck cancer; evidence is insufficient for other sites, and caution is advised due to study limitations.