Objective To analyze the role of postmastectomy radiotherapy in different molecular subtypes of breast cancer patients with Stage T1 -T2 and one to three positive axillary nodes. Methods A total of 436 breast cancer patients with T1 -T2 and one to three positive axillary lymph nodes treated with mastectomy and axillary dissection were retrospectively analyzed. Patients were grouped as the following four subtypes:Luminal A, Luminal B, Her2+ and triple-negative. The local recurrence (LR), distant metastasis ( DM ), disease free survival (DFS) and overall survival (OS) rates were compared between paitents with or without radiotherapy in univariate analyses. Multivariate analyses for LR were performed. Results The follow-up rate was 86. 0％. In patients with Luminal A subtype, radiotherapy decreased the 5-year LR rate (4.6％ vs 15.8％ ,x2 =5.74,P=0.017) but had no influences on DM, DFS or OS rates (17.2％ vs 19.7％,x2 =0. 17,P=0.682;77.0％ vs 67. 1％ ,x2 =1.99,P=0. 158 or87.4％:85. 5％ ,x2 =0. 12,P=0. 733 ). In patients with Luminal B subtype, radiotherapy decreased the 5-year LR rate (3.7％ vs 12. 1％,x2 =4. 13, P =0. 042), increased DFS and OS ( 84. 0％ vs 57.6％ ( x2 =14.61, P =0. 000) and 91.4％ vs 70. 7％ ( x2 =11.87, P =0. 001 ), but had no influence on DM ( 12. 3％ vs 22. 2％, x2 =2. 97, P =0. 085).In patients with Her2+ subtype, radiotherapy decreased the 5-year LR rate (5. 6％ vs 31.0％ ,x2 =4. 31,P=0. 035) , increased DFS (61. 1％ vs 13. 8％ ,x2 =11.44,P=0.001 ) ,but had no influence on DM and OS (27.8％ vs 41.4％, x2 =0. 89, P =0. 345 and 66. 7％ vs 48. 3％, x2 =1.52,P =0. 218 ). In patients with triple-negative subtype, radiotherapy had no influence in LR, DM, DFS or OS (8. 7％ vs 26. 1％ ,x2 =2.42,P=0.120;39.1％ vs47.8％,x2=0.35,P=0.552;52.2％ vs 26.1％ , x2 =3. 29, P =0. 070 or 65.2％ vs 56. 5％ ,x2 =0. 37 ,P =0. 546). Tumor size and radiotherapy were independent prognostic factors for LR rate in multivariate analyses ( x2 =4. 76, P =0. 029 and x2 =8.06, P =0. 005 ). Conclusions For patients with stage T1 -T2 and one to three positive axillary nodes, patients with all molecular subtypes except triple-negative can benefit from postmasteetomy radiotherapy.%目的 探讨放疗对不同分子亚型的改良根治术后T1～T2期伴1～3个腋窝淋巴结转移乳腺癌患者的预后影响。方法 将2001-2004年本院行改良根治术的436例乳腺癌患者资料按Luminal A、Luminal B、Her2+、三阴型分子亚型分为4个组,分析各组放疗与未放疗5年局部复发(LR)率、远处转移(DM)率、无瘤生存(DFS)率和总生存(0S)率差别和影响局部复发因素。结果 随访率为86.0％;Luminal A型中放疗的5年LR率低于未放疗的(4.6％:15.8％,x2=5.74,P=0.017),DM、DFS、OS的均相似(17.2％:19.7％,x2=0.17,P=0.682;77.0％:67.1％,x2=1.99,P=0.158;87.4％:85.5％,x2=0.12,P=0.733)。Luminal B型中放疗的5年LR率低于未放疗的(3.7％:12.1％,x2 =4.13,P=0.042),DFS和OS放疗的高于未放疗的[84.0％:57.6％(x2=14.61,P=0.000)和91.4％:70.7％ (x2=11.87,P=0.001)],DM的相似(12.3％:22.2％,x2=2.97,P=0.085)。Her2+型中放疗的5年LR率低于未放疗的(5.6％:31.0％,x2 =4.31,P=0.035),DFS放疗的高于未放疗的(61.1％:13.8％,x2=11.44,P=0.001),DM和OS均相似(27.8％:41.4％,x2=0.89,P=0.345和66.7％:48.3％,x2=1.52,P=0.218)。三阴型中LR、DM、DFS、OS的均相似(8.7％:26.1％,x2=2.42,P =0.120;39.1％:47.8％,x2 =0.35,P =0.552;52.2％:26.1％,x2=3.29,P =0.070;65.2％:56.5％,x2=0.37,P=0.546)。多因素分析显示肿瘤大小和放疗为影响局部复发的独立因素(x2 =4.76,P=0.029和x2 =8.06,P=0.005)。结论 改良根治术后T1～T2期伴1～3个腋窝淋巴结转移乳腺癌患者中Luminal A、Luminal B、Her2+型均可从放疗中不同程度获益,而三阴型未显示获益。
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