What Researchers Did
Researchers monitored oxygen levels and pH in tissues and tumors of 12 patients undergoing isolated limb perfusion (ILP) with melphalan, tripling oxygen supply to the perfusate near the end of the procedure.
What They Found
Increasing oxygen supply during isolated limb perfusion (ILP) significantly raised arterial pO2 from 25.5 to 49.4 kPa and subcutaneous pO2 from 10.1 to 16.3 kPa. While muscle pH improved (p = 0.011), tumor pH in 4 patients rose from 7.10 to 7.22, which may negatively impact melphalan's effectiveness as low pH enhances its cytotoxicity.
What This Means for Canadian Patients
For Canadian patients undergoing isolated limb perfusion with melphalan, this study suggests that increasing oxygen in the perfusate might improve muscle tissue health. However, this approach could potentially reduce the anti-cancer effect of melphalan by raising tumor pH, which is generally undesirable for this chemotherapy.
Canadian Relevance
This pilot study has no direct Canadian connection.
Study Limitations
This was a pilot study with a small sample size, particularly for tumor pH measurements, and the observed tumor pH rise was not statistically significant.