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05.01.2019 | Preclinical study

Three-dimensional tumor visualization of invasive breast carcinomas using whole-mount serial section histopathology: implications for tumor size assessment

verfasst von: G. M. Clarke, C. M. B. Holloway, J. T. Zubovits, S. Nofech-Mozes, M. Murray, K. Liu, D. Wang, A. Kiss, M. J. Yaffe

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2019

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Abstract

Purpose

Linear tumor size (T-size) estimated with conventional histology informs breast cancer management. Previously we demonstrated significant differences in margin and focality estimates using conventional histology versus digital whole-mount serial sections (WMSS). Using WMSS we can measure T-size or volume. Here, we compare WMSS T-size with volume, and with T-size measured conventionally. We also compare the ellipsoid model for calculating tumor volume to direct, WMSS measurement.

Methods

Two pathologists contoured regions of invasive carcinoma and measured T-size from both WMSS and (simulated) conventional sections in 55 consecutive lumpectomy specimens. Volume was measured directly from the contours. Measurements were compared using the paired t-test or Spearman’s rank-order correlation. A five-point ‘border index’ was devised and assigned to each case to parametrize tumor shape considering ‘compactness’ or cellularity. Tumor volumes calculated assuming ellipsoid geometry were compared with direct, WMSS measurements.

Results

WMSS reported significantly larger T-size than conventional histology in the majority of cases [61.8%, 34/55; means = (2.34 cm; 1.99 cm), p < 0.001], with a 16.4% (9/55) rate of ‘upstaging’. The majority of discordances were due to undersampling. T-size and volume were strongly correlated (r = 0.838, p < 0.001). Significantly lower volume was obtained with WMSS versus ellipsoid modeling [means = (1.18 cm³; 1.45 cm³), p < 0.001].

Conclusions

Significantly larger T-size is measured with WMSS than conventionally, due primarily to undersampling in the latter. Volume and linear size are highly correlated. Diffuse tumors interspersed with normal or non-invasive elements may be sampled less extensively than more localized masses. The ellipsoid model overestimates tumor volume.

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Titel: Three-dimensional tumor visualization of invasive breast carcinomas using whole-mount serial section histopathology: implications for tumor size assessment
verfasst von: G. M. Clarke
C. M. B. Holloway
J. T. Zubovits
S. Nofech-Mozes
M. Murray
K. Liu
D. Wang
A. Kiss
M. J. Yaffe
Publikationsdatum: 05.01.2019
Verlag: Springer US
Erschienen in: Breast Cancer Research and Treatment / Ausgabe 3/2019
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-018-05122-7

Springer Medizin

Three-dimensional tumor visualization of invasive breast carcinomas using whole-mount serial section histopathology: implications for tumor size assessment