Abstract
Background
Treatment of patients with peritoneal carcinomatosis (PC) of colorectal cancer (CRC) includes cytoreductive surgery (CS) in combination with (hyperthermic) intraperitoneal chemotherapy (HIPEC), resulting in a limited survival benefit with high morbidity and mortality rates. Radioimmunotherapy (RIT) as adjuvant therapy after CS of CRC has been shown to prolong survival in preclinical studies. However, the optimal setting of RIT remains to be determined.
Methods
PC was induced by intraperitoneal inoculation of CC-531 colon carcinoma cells in Wag/Rij rats. Animals were subjected to exploratory laparotomy (Sham), CS only or CS + RIT at different time points after surgery. RIT consisted of 55 MBq lutetium-177-labelled anti-CC531 antibody MG1 (183 μg). The primary endpoint was survival.
Results
Cytoreductive surgery with or without RIT was well tolerated. Median survival of animals in the Sham and CS group was 29 days and 39 days, respectively (P < 0.04). Compared to CS alone, median survival of rats after adjuvant RIT was 77 days (P < 0.0001), 52 days (P < 0.0001) and 45 days (P < 0.0001) when given directly, 4 and 14 days after surgery, respectively.
Conclusion
The efficacy of adjuvant RIT after CS for the treatment of PC of colonic origin decreases when the administration of the radiolabelled MAbs is postponed. This study shows that adjuvant RIT should be given as early as possible after surgery.
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Acknowledgments
The authors wish to thank Ben de Man and Roger Lomme (Radboud University Nijmegen Medical Center, Surgical Research Laboratory) for their excellent assistence during the operative procedures, Gerry Grutters and Henny Eikholt (Radboud University Nijmegen Medical Center, Central Animal Laboratory) for their assistance in the animal experiments. Part of this study was supported by a grant from the Netherlands Organization for Health Research and Development (ZonMw); Grant number: 920–03-220
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Aarts, F., Koppe, M.J., Hendriks, T. et al. Timing of Adjuvant Radioimmunotherapy after Cytoreductive Surgery in Experimental Peritoneal Carcinomatosis of Colorectal Origin. Ann Surg Oncol 14, 533–540 (2007). https://doi.org/10.1245/s10434-006-9247-x
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DOI: https://doi.org/10.1245/s10434-006-9247-x