Abstract：
BACKGROUND:Based on their different mechanisms of action, non-overlapping side effects and radiosensitising potential, combining the antimetabolites pemetrexed (multitargeted antifolate, MTA) and gemcitabine (2',2'-difluorodeoxycytidine, dFdC) with irradiation (RT) seems promising. This in vitro study, for the first time, presents the triple combination of MTA, dFdC and irradiation using various treatment schedules. METHODS:The cytotoxicity, radiosensitising potential and cell cycle effect of MTA were investigated in A549 (NSCLC) and CAL-27 (SCCHN) cells. Using simultaneous or sequential exposure schedules, the cytotoxicity and radiosensitising effect of 24 h MTA combined with 1 h or 24 h dFdC were analysed. RESULTS:Including a time interval between MTA exposure and irradiation seemed favourable to MTA immediately preceding or following radiotherapy. MTA induced a significant S phase accumulation that persisted for more than 8 h after drug removal. Among different MTA/dFdC combinations tested, the highest synergistic interaction was produced by 24 h MTA followed by 1 h dFdC. Combined with irradiation, this schedule showed a clear radiosensitising effect. CONCLUSIONS:Results from our in vitro model suggest that the sequence 24 h MTA --> 1 h dFdC --> RT is the most rational design and would, after confirmation in an in vivo setting, possibly provide the greatest benefit in the clinic.
journal_name
BMC Cancerjournal_title
BMC cancerauthors
Wouters A,Pauwels B,Lardon F,Pattyn GG,Lambrechts HA,Baay M,Meijnders P,Vermorken JBdoi
10.1186/1471-2407-10-441subject
Has Abstractpub_date
2010-08-19 00:00:00pages
441issn
1471-2407pii
1471-2407-10-441journal_volume
10pub_type
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