Abstract
Purpose
We have previously shown that low-dose interleukin-2 (IL-2) and 13-cis-retinoic acid (13-cis-RA) improved lymphocyte and natural killer (NK) cell count of patients with advanced tumors showing a clinical benefit from chemotherapy. The primary endpoint of this study was to ask whether IL-2 and 13-cis-RA improved (-0%) lymphocyte and NK cell count in patients with metastatic colorectal cancer (MCRC) that had a clinical benefit from induction chemotherapy. Secondary endpoint was the evaluation of toxicity, progression-free survival (PFS), and overall survival (OS).
Patients and methods
Forty patients with MCRC, showing a clinical benefit from chemotherapy, were treated with subcutaneous low-dose IL-2 (1.8 × 106 IU) and oral 13-cis-RA (0.5 mg/kg) in order to maintain responses and improve survival through the increase of lymphocyte and NK cells. The biological parameters and the clinical outcome of these patients were compared with those of a control group of patients (80) with a similar disease status, including clinical benefit from chemotherapy.
Results
The most common adverse events were mild cutaneous skin rash and fever. After 4 months and 2 years of biotherapy, a statistically significant improvement was observed in lymphocyte and number of NK cells with respect to baseline values and to controls. After a median follow-up of 36 months, median PFS was 27.8 months, while median OS was 52.9 months.
Conclusion
These data show that maintenance immunotherapy with low-dose IL-2 and oral 13-cis-RA in patients with MCRC showing a clinical benefit from chemotherapy is feasible, has a low toxicity profile, improves lymphocyte and NK cell count. An improvement in the expected PFS and OS was also observed. A randomized trial is warranted.
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Recchia, F., Saggio, G., Cesta, A. et al. Phase II study of interleukin-2 and 13-cis-retinoic acid as maintenance therapy in metastatic colorectal cancer. Cancer Immunol Immunother 56, 699–708 (2007). https://doi.org/10.1007/s00262-006-0224-9
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DOI: https://doi.org/10.1007/s00262-006-0224-9