Objective: To study the correlation of apparent diffusion coefficient (ADC) measured by diffusion-weighted magnetic resonance imaging (MRI) with the molecular subtypes and biological prognostic factors of invasive breast cancer masses.
Methods: Breast MRI data (including dynamic enhanced and diffusion-weighted imaging) were collected from 64 patients with pathologically confirmed invasive breast cancer masses (a total of 69 lesions). The mean ADC values of the lesions were calculated and their correlations were analyzed with the 5 molecular subtypes of invasive breast cancer and the biological prognostic factors including estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor 2 (HER2), and Ki-67 index.
Results: The ADC values did not differ significantly among the 5 molecular subtypes of invasive breast cancer masses (P>0.05) or among lesions with different ER, PR, or HER2 status (P>0.05). The mean ADC values were significantly higher in Ki-67-positive lesions than in the negative lesions (P=0.023 and negatively correlated with the expressions of Ki-67 (r=-0.249).
Conclusion: ADC value can not be used to identify the molecular subtypes of invasive breast cancer masses or to evaluate the biological prognosis of the lesions, but its correlation with Ki-67 expression may help in prognostic evaluation and guiding clinical therapy of the tumors.
目的: 探讨磁共振扩散加权成像表观扩散系数(ADC）与肿块型浸润性乳腺癌5种分子亚型及其生物学预后因子相关性。
方法: 回顾分析64例经手术或活检病理证实为浸润性乳腺癌患者（69个肿块型病灶）的磁共振影像学资料，比较不同分子亚型间平均ADC值及其与乳腺癌生物学预后因子雌激素受体、孕激素受体、人类表皮生长因子受体-2、Ki-67的表达的关系。
结果: 浸润性乳腺癌5种分子亚型间ADC值无显著差异（P>0.05）；雌激素受体、孕激素受体、人类表皮生长因子受体-2阳性、阴性组ADC值差异均无统计学意义（P>0.05）；但HER2阳性组平均ADC值高于阴性组；Ki-67阳性、阴性组ADC值差异有统计学意义（P=0.023）。阴性组ADC值明显高于阳性组，ADC值与Ki-67的表达呈负相关（r=-0.249）。
结论: ADC不能鉴别肿块型浸润性乳腺癌5种分子亚型，但与浸润性乳腺癌预后因子Ki-67的表达存在相关性，对指导治疗和判断预后有一定意义。