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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Influence of chemotherapy administration on monocyte activation by liposomal muramyl tripeptide phosphatidylethanolamine in children with osteosarcoma.

The purpose of these studies was to determine whether chemotherapy interfered with the ability of peripheral blood monocytes from patients with osteosarcoma to respond to the liposome-encapsulated activating agent muramyl tripeptide phosphatidylethanolamine (L-MTP-PE). This was done in preparation of designing an adjuvant therapy protocol that includes L-MTP-PE combined with chemotherapy postoperatively for the treatment of primary osteosarcoma. The majority of patients who fail current adjuvant chemotherapy do so while on chemotherapy. Therefore, we believe it is important to combine L-MTP-PE with chemotherapy early in the treatment course rather than waiting until all chemotherapy cycles are completed. The tumoricidal properties of monocytes from patients with osteosarcoma could be activated by L-MTP-PE to levels equal to or greater than those expressed by normal control monocytes. No intrinsic monocyte defect could be demonstrated. Single-agent chemotherapy consisting of cisplatin ( CPD), high-dose methotrexate (MTX), Cytoxan ( CTX, cyclophosphamide; Bristol-Myers Co, Evansville, IN), or Adriamycin ( ADR, doxorubicin; Adria Laboratories, Columbus, OH) did not interfere with this activation process. There was even a suggestion of enhanced activation potential following the administration of ADR. However, when both ADR and CTX were administered together on the same day, profound suppression in monocyte activation was observed. This suppressed function returned to normal by 3 weeks postcombination therapy. We therefore conclude that L-MTP-PE can be combined with ADR, CPD, MTX, or CTX as single agents but recommend that ADR plus L-MTP-PE is the most effective combination. By contrast, we discourage the use of L-MTP-PE when ADR and CTX are given together.[1]


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