脑部放疗,上午比下午敏感许多!4 _4 R; e9 y! q, p4 @3 @: ~3 e2 l
1 a5 @9 C* \) K, x
5 s4 o5 X2 b1 o5 jCancer 2011 Jan 15;117(2):414-20. doi: 10.1002/cncr.25423. Epub 2010 Sep 9.+ y4 h6 I! T7 v) B7 T1 Q
Gamma knife radiosurgery for brain metastasis of nonsmall cell lung cancer: is there a difference in outcome between morning and afternoon treatment?5 U; c3 f& G' {' g: t8 [4 J' E+ f
Rahn DA 3rd, Ray DK, Schlesinger DJ, Steiner L, Sheehan JP, O'Quigley JM, Rich T.
+ Q+ N9 Q" Y8 `/ |SourceDepartment of Radiation Oncology, University of Virginia Health Sciences Center, Charlottesville, Virginia 22908, USA.
$ ~2 e) c! s m0 B
6 {9 l) e# H/ V1 \! f' n4 bAbstract
i: c3 \6 k3 }, [BACKGROUND: 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.
) G5 A( |; B4 v! z9 X+ }
2 q7 K5 F' ]9 I7 x0 KMETHODS: 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.6 e- h) \4 h8 ?
, S" n+ p+ \* s& M9 M
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).
3 @; H( F# y/ j3 O* v7 ~! i) \+ N
( ^! K8 ?" p" N& N- |CONCLUSIONS: 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.
3 U: S: A! d* x/ t; d. {" @
! |8 ~/ h7 p+ ~; A! O1 a" s6 c |