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Abstract

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Á¶»ç¼±·® 5040-6940 cGy (Áß¾Ó°ª 5040 cGy), 180 cGy/fx ·Î Ä¡·áÇÏ¿´°í B±ºÀº ÃÑ Á¶»ç¼±
·® 4320-5100 cGy (Áß¾Ó°ª 4560 cGy)À¸·Î 29¸í (69%)Àº 120 cGy/fx ·Î, 13¸í (31%)Àº 150
cGy/fx ·Î 1ÀÏ 2ȸ Á¶»çÇÏ¿´´Ù. È­Çпä¹ýÀº Àüü 68¸í Áß 65¸í¿¡¼­ VPP (cisplatin 60
mg/m2, etoposide 100 mg/m2) ¿ä¹ý°ú CAV (cytoxan 1000
mg/m2, adriamycin 40 mg/m2, vincristine 1
mg/m2) ¿ä¹ýÀ» ±³´ë·Î ½ÃÇàÇÏ¿´À¸¸ç, È­Çпä¹ý Ƚ¼ö´Â A±º 3-10ȸ (Áß¾Ó°ª
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°Ô ³ªÅ¸³µ´Ù(p=0.028, 0.003).
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°ÍÀ¸·Î »ç·áµÈ´Ù.

Purpose : A retrospective study was conducted comparing single daily fraction (SDF)
thoracic radiotherapy (TRT) with twice daily (BID) TRT to determine the potential
benefit of BID TRT in limited-stage small cell lung cancer(SCLC). Endpoints of the
study were response, survival, pattern of failure and acute toxicity.
Materials and Methods : Between November 1989 to December 1996, 78 patients with
histologically proven limited-stage SCLC were treated at the Department of Therapeutic
Radiology. Chungnam National University Hospital Of these, 9 were irradiated for
palliative intent, and 1 had recurrent disease. Remaining 68 patients were enrolled in this
study. There were 26 patients with a median age of 58 years, and 22 (85%) ECOG
performance score of less than 1 in SDF TRT. There were 42 patients with a median
age of 57 years, and 36 (86%) ECOG performance score of less than 1 in BID TRT. By
radiation fractionation regimen, there were 26 in SDF TRT and 42 in BID TRT. SDF
TRT consisted of 180 cGy, 5 days a week. BID TRT consisted of 150 cGy BID, 5 days
a week in 13 of 42 and 120 cGy BID, in 29 of 42. And the twice daily fractions were
separated by at least 4 hours. Total radiotherapy doses were between 5040 and 6940
cGy (median, 5040 cGy) in SDF TRT and was between 4320 and 5100 cGy (median,
4560, cGy) in BID TRT. Prophylactic cranial irradiation (PCI) was recommended for
patients who achieved a CR. The recommended PCI dose was 2500 cGy/10 fractions.
Chemotherapy consisted of CAV (cytoxan 1000 mg/m2, adriamycin 40
mg/m2, vincristine 1 mg/m2) alternating with VPP (cisplatin
60 mg/m2 etoposide 100 mg/m2) every 3 weeks in 25 (96%)
of SDF TRT and in 40 (95%) of 81D TRT. Median cycle of chemotherapy was six in
both group. Timing for chemotherapy was sequential in 23 of SDF TRT and in 3 BID
TRT, and concurrent in 3 of SDF TRT and in 39 of BID TRT. Follow-up ranged from
2 to 99 months (median, 14 months) in both groups.
Results : Of the 26 SDF TRT, 9 (35%) achieved a complete response (CR) and 14
(54%) experienced a partial response (PR). Of the 42 BID TRT, 18(43%) achieved a CR
and 23 (55%) experienced a PR. There was no significant response difference between
the two arms (p=0.119). Overall median and 2-year survival were 15 months and 26.8%,
respectively. The 2-year survivals were 26.9% and 28% in both arm, respectively
(P=0.51). The 2-year survivals were 35% in CR and 24.2% in PR, respectively. The
glade 2 to 3 esophageal toxicities and glade 2 to 4 neutropenias were more common in
BID TRT (P=0.028, 0.003) There was no difference in locoregional and distant
metastasis between the two arms (p=0.125 and 0.335 respectively). The most common
site of distant metastasis was the brain.
Conclusion : The median survival and 2-year survival were 17 months and 26.9% in
SDF TRT with sequential chemotherapy, and 15 months and 28% in BID TRT with
concurrent chemotherapy, respectively. We did not observe a substantial improvement of
long-term survival in the BID TRT with concurrent chemotherapy compared with
standard schedules of SDF TRT with sequential chemotherapy The glade 2 to 3
esophageal toxicities and glade 2 to 4 neutropenias were more common in BID TRT
with concurrent chemotherapy. Although the acute toxicities were more common in BID
TRT with concurrent chemotherapy than SDF TRT with sequential chemotherapy, a
concurrent chemotherapy and twice daily TRT was feasible. However further patient
accrual and long-term follow up are needed to determine the potential benefits of BID
TRT in limited-stage SCLC.

Å°¿öµå

Limited stage; Small cell lung cancer; Chemotherapy; Radiotherapy; BID;

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