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Eur Radiol. 2014 Sep;24(9):2227-35. doi: 10.1007/s00330-014-3256-0. Epub 2014 Jun 4.

Tumour volume doubling time of molecular breast cancer subtypes assessed by serial breast ultrasound.

Author information

1
Department of Radiology, Dongnam Institute of Radiological and Medical Sciences Cancer Center, Busan, Korea.
2
Department of Radiology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea.
3
Department of Radiology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea. moon.wk@snu.ac.kr

Abstract

OBJECTIVES:

The aim of our study was to evaluate the tumour volume doubling time (TVDT) of molecular breast cancer subtypes by serial ultrasound (US).

METHODS:

Sixty-six patients (mean age, 50 years; range, 29-78 years) with invasive breast cancer underwent initial and follow-up breast US examinations (at least three months apart) with no intervention. TVDT was determined using the tumours' greatest dimensions in two orthogonal planes. The results were compared with clinical, imaging, and tumour variables and molecular subtypes (oestrogen receptor [ER]-positive, human epidermal growth factor receptor 2 [HER2]-positive, and triple negative) using a multiple linear regression analysis.

RESULTS:

TVDT exhibited a wide range (46-825 days; median, 141 days) with an overall mean of 193 ± 141 days and mean values of 241 ± 166 days for ER-positive tumours (n = 37), 162 ± 60 days for HER2-positive tumours (n = 12), and 103 ± 43 days for triple-negative tumours (n = 17) (P < 0.0001). In a multivariate regression analysis, compared to other features, only the different molecular breast cancer subtypes showed significant difference in TVDT (P < 0.0001).

CONCLUSIONS:

TVDT differed significantly among the three molecular breast cancer subtypes, with the triple-negative tumours showing the fastest growth.

KEY POINTS:

Knowledge of tumour volume doubling time provides clues for improving screening. TVDT assessed by serial US differed significantly between breast cancer subtypes. Triple-negative tumours had 2.4-fold shorter TVDT compared to ER-positive tumours. Tumours classified as BI-RADS 3 had shorter TVDT than BI-RADS 4.

PMID:
24895040
DOI:
10.1007/s00330-014-3256-0
[Indexed for MEDLINE]

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