崔世恩, 储 兵, 凌飞海. Subtypes of breast cancer show different patterns of metastasis: a 10-year survival analysis of 390 patients with primary breast cancer[J]. China Oncology, 2015, 25(10): 774-779.
崔世恩, 储 兵, 凌飞海. Subtypes of breast cancer show different patterns of metastasis: a 10-year survival analysis of 390 patients with primary breast cancer[J]. China Oncology, 2015, 25(10): 774-779. DOI: 10.3969/j.issn.1007-3969.2015.10.003.
Subtypes of breast cancer show different patterns of metastasis: a 10-year survival analysis of 390 patients with primary breast cancer
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 Kaplan- Meier technique. Results: Among 390 eligible patients
there were 215(55.1%) with Luminal A
43 (11.0%) with Luminal 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.
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Department of Breast Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College
Department of Breast Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital& Shenzhen Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College