Background and purpose:Breast cancer can be divided into several molecular subtypes according to its biomarkers. The pattern of distant metastasis has a great clinic significance but was rarely investigated. This study investigated the impact of molecular subtype of breast cancer on initial sites of metastasis..Methods:All the patients with operable invasive breast cancer diagnosed in Zhongshan People’s Hospital between 1998 and 2004 were recruited. Subtypes were defined as Luminal A, Luminal B, human epidermal growth factor receptor 2 (HER-2) enriched, and triple negative (TN) according to the expression of estrogen receptor (ER), progestogen receptor (PR) and HER-2 status. The first distant metastatic sites and the time of their appearances were recorded. Survival curves were constructed using the Ka-plan-Meier technique.Results:Among 390 eligible patients, there were 215(55.1%) with Luminal A, 43 (11.0%) with Lu-minal B, 52 (13.3%) with HER-2 enriched, and 80 (20.5%) with TN. The median follow-up time was 118 months (11-163 months). Seventy-two (18.5%) distant metastases occurred during follow-up: 37 metastases in Luminal A, 8 in Luminal B, 10 in HER-2, 17 in TN. Bone was the most common site of the first distant metastasis (39/72, 54.2%) followed by lung (25/72, 34.7%), liver (22/72, 30.6%), and brain (7/72, 9.7%). Among all the metastases, tumors of Luminal type (Luminal A 70.2%, Luminal B 50.0%) had a higher chance of bone involvement than that of HER-2 enriched (30.0%) and TN (35.3%,P=0.03). Both Luminal B (37.5%) and TN (17.6%) subtypes had a higher percentage of brain involvement than Luminal A and HER-2 enriched (P=0.01). The survival analysis showed no significant difference among the four subtypes in 9-year distant metastasis-free survival. However, distant metastasis appeared earlier in HER-2 enriched and TN breast cancer than in Luminal type.Conclusion:Organ-specific metastasis may depend on the molecular subtype of breast cancer. Bone metastasis occurs more in luminal type than in other types. Luminal B and TN types of tumors had more chance of brain metastasis than Luminal A and HER-2 enriched type of tumors.%背景与目的：根据肿瘤的分子标志物不同，乳腺癌可以被分为几种亚型。不同亚型转移模式的区别对患者治疗方式的选择有很大临床意义，但目前探讨较少。该研究探讨了不同分子亚型的乳腺癌易首发转移的部位以及时间。方法：1998—2004年间在中山市人民医院接受手术治疗的早期原发性浸润性乳腺癌患者共390例纳入该研究。肿瘤分为Luminal A、Luminal B、HER-2过表达型和三阴性型4种亚型。随访这些患者，记录初次远处转移部位及时间，采用Kaplan-Meier法进行生存分析。结果：390例患者中，Luminal A型215例(55.1%)、三阴性型80例(20.5%)、HER-2型52例(13.3%)、Luminal B型43例(11.0%)。中位随访118个月(11～163个月)，72例(18.5%)出现远处转移：其中Luminal A型37例，Luminal B型8例，HER-2过表达型10例和三阴性型17例。骨是最常见的首次转移部位(39/72，54.2%)，其次是肺(25/72，34.7%)、肝(22/72，30.6%)、脑(7/72，9.7%)。Luminal型(Luminal A型70.2%，Luminal B型50.0%)患者的骨转移比例显著高于HER-2过表达型(30.0%)及三阴性型(35.3%)乳腺癌(P=0.03)。Luminal B型(37.5%)和三阴性(17.6%)乳腺癌的脑转移比例显著高于Luminal A型和HER-2过表达型(P＝0.01)。生存分析显示不同亚型乳腺癌的9年无远处转移生存率差异无统计学意义，但是HER-2过表达型和三阴性型乳腺癌转移出现显著早于Luminal型乳腺癌。结论：不同亚型乳腺癌的初次远处转移模式不同。Luminal型转移出现较早、易发生骨转移；三阴性乳腺癌和Luminal B型乳腺癌转移出现较晚，并易发生脑转移。
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