Figure 1. Tumor implantation. Two PMMA plates were applied using sandwich technique on the peritoneum and the outer surface of the abdominal wall musculature, but beneath the skin. The tumor (approximately 1 mm³) was harvested from a subcutaneous parent tumor of a syngeneic rat and interposed intraperitoneally between the plates. One lead plate was used to protect the abdominal organs from radiation. Another PMMA plate was placed on the lead to prevent intraperitoneal adhesions.