BACKGROUND: We studied the modulatory effects of 7-ethyl-10-hydroxy-camptothecin (SN-38), an active metabolite of 7-ethyl-10-[4-(1-piperidino)-1-piperidino] carbonyloxycamptothecin, on the antitumor activities of clinically important anticancer drugs including cisplatin (CDDP), 5-fluorouracil (5-FU), mitomycin C (MMC), etoposide (VP-16), and adriamycin (ADR). MATERIALS AND METHODS: The HST-1 human carcinoma cells were treated with graded concentrations of these anticancer drugs either alone or in combination with IC50 concentration of SN-38, administered in several different treatment schedules, and antitumor activity was evaluated by the growth inhibition assay. RESULTS: SN-38 potentiated the antitumor activity of CDDP in all schedules with a maximal effect observed with a simultaneous administration, while SN-38 enhanced the cytotoxicity of MMC, 5-FU, or VP-16 only in certain schedules. By contrast, SN-38 attenuated the anticancer effect of ADR in all schedules. CONCLUSIONS: These results demonstrate that SN-38 may have the advantage of augmenting the anticancer activity in combination with CDDP, MMC, 5-FU, and VP-16, depending on the schedule of administration, and should thus be incorporated into the design of a clinical trial for obtaining maximal therapeutic synergy.
BACKGROUND: We studied the modulatory effects of 7-ethyl-10-hydroxy-camptothecin (SN-38), an active metabolite of 7-ethyl-10-[4-(1-piperidino)-1-piperidino] carbonyloxycamptothecin, on the antitumor activities of clinically important anticancer drugs including cisplatin (CDDP), 5-fluorouracil (5-FU), mitomycin C (MMC), etoposide (VP-16), and adriamycin (ADR). MATERIALS AND METHODS: The HST-1humancarcinoma cells were treated with graded concentrations of these anticancer drugs either alone or in combination with IC50 concentration of SN-38, administered in several different treatment schedules, and antitumor activity was evaluated by the growth inhibition assay. RESULTS:SN-38 potentiated the antitumor activity of CDDP in all schedules with a maximal effect observed with a simultaneous administration, while SN-38 enhanced the cytotoxicity of MMC, 5-FU, or VP-16 only in certain schedules. By contrast, SN-38 attenuated the anticancer effect of ADR in all schedules. CONCLUSIONS: These results demonstrate that SN-38 may have the advantage of augmenting the anticancer activity in combination with CDDP, MMC, 5-FU, and VP-16, depending on the schedule of administration, and should thus be incorporated into the design of a clinical trial for obtaining maximal therapeutic synergy.
Authors: Mustafa Altinbas; Ozlem Er; Metin Ozkan; Yusuf Solak; H Senol Coskun; Can Kucuk; Sebnem Gursoy Journal: Med Oncol Date: 2005 Impact factor: 3.064
Authors: William P Tew; Delia Radovich; Eileen O'Reilly; Gary Schwartz; Deborah Schrag; Leonard B Saltz; David P Kelsen; Stacey Kepler; David H Ilson Journal: Invest New Drugs Date: 2008-10-28 Impact factor: 3.850
Authors: Eufemia Jacob; Kathy Scorsone; Susan M Blaney; David Z D'Argenio; Stacey L Berg Journal: Pediatr Blood Cancer Date: 2008-04 Impact factor: 3.167
Authors: V M Herben; W W ten Bokkel Huinink; A C Dubbelman; I A Mandjes; Y Groot; D M van Gortel-van Zomeren; J H Beijnen Journal: Br J Cancer Date: 1997 Impact factor: 7.640