脑部放疗,上午比下午敏感许多!- s, X/ k3 U, T& P
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. k) C" u; r- ^/ P& N& M2 _Cancer 2011 Jan 15;117(2):414-20. doi: 10.1002/cncr.25423. Epub 2010 Sep 9./ w9 Y% D' j; ]$ o( Q* F* C
Gamma knife radiosurgery for brain metastasis of nonsmall cell lung cancer: is there a difference in outcome between morning and afternoon treatment?
* d# i& k3 i! ^8 cRahn DA 3rd, Ray DK, Schlesinger DJ, Steiner L, Sheehan JP, O'Quigley JM, Rich T.
0 Q% }% d+ i; @SourceDepartment of Radiation Oncology, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA.
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b% @3 L3 w# F& H8 X0 OAbstract
8 f& k+ H0 f0 u3 V; vBACKGROUND: Circadian cell-cycle progression causes fluctuating radiosensitivity in many tissues, which could affect clinical outcomes. The purpose of this study was to determine whether outcomes of single-session gamma knife radiosurgery (GKRS) for metastatic nonsmall cell lung cancer (NSCLC) differ based on treatment time.
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4 z3 x: \4 {: ?, S7 a, ^5 b7 OMETHODS: Fifty-eight patients received GKRS between 10:00 am and 12:30 pm and 39 patients received GKRS between 12:30 pm and 3:00 pm. The mean peripheral dose was 18.6 Gy. The mean tumor size was 7.3 cm³. Magnetic resonance imaging was used to score local control at 3 months. Cause of death (COD) was categorized as central nervous system (CNS)-related or systemic. f8 g$ q4 K5 T" {
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RESULTS: Demographic and disease characteristics of the 2 groups were similar. Local control at 3 months was achieved in 97% (35/36) of patients who underwent GKRS early in the day versus 67% (8/12) of patients who underwent GKRS later in the day (chi-square, P = .014). Early GKRS was associated with better survival (median 9.5 months) than late GKRS (median 5 months) (Kaplan-Meier log-rank test, P = .025). Factors contributing to better survival in a Cox regression model included early treatment time (P = .004) and recursive partition analysis class (P < .001). Cause of death in the early treatment group was CNS-related in 6% (3/47) of patients versus 24% (8/34) of patients in the late treatment group (chi-square test, P = .026).
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5 S) C, K9 U3 b& lCONCLUSIONS: GKRS for metastatic NSCLC had better local control, better survival, and a lower rate of CNS-related cause of death when given earlier in the day versus later in the day. These retrospective data should encourage future study in brain radiosurgery and non-CNS stereotactic body radiotherapy series.
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