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Splenic Enlargement and Bone Marrow Hyperplasia in Patients Receiving Trastuzumab-Emtansine for Metastatic Breast Cancer

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Abstract

Background

An association between trastuzumab-emtansine (T-DM1) and splenic enlargement is reported in preclinical data, and has been noted anecdotally in patients receiving T-DM1 at our institution. Use of whole-body MRI examinations (WB-MRI) allows for detailed bone marrow assessment and semi-automated splenic volume calculations.

Objective

To retrospectively evaluate changes in splenic volume versus evidence of bone marrow hyperplasia and/or changes in portal venous pressure in patients receiving T-DM1 for metastatic breast cancer.

Patients and Methods

Twelve metastatic breast cancer patients underwent 29 WB-MRIs before and during T-DM1 therapy. Splenic volume, portal vein diameter, bone marrow diffusion-weighted normalised signal intensity (nSI), quantitative water diffusivity (apparent diffusion coefficient, ADC) and fat fraction (rF%) were measured and correlated.

Results

Splenic volume increases were observed in 92% of patients. Mean splenic volume increased from 144 cm3 (95% CI 110–177 cm3) to 209 cm3 (95% CI 161–257 cm3) on T-DM1 therapy (p = 0.006). Splenic volume increases correlated with treatment duration (r2 = 0.43). Bone marrow hyperplasia was evidenced by an increase in bone marrow nSI (3.5 to 4.8, p = 0.12), and decreases in rF% (64.3% to 57.3%, p = 0.12) and ADC (655 μm2/s to 543 μm2/s, p = 0.11). No changes to portal vein diameter were seen.

Conclusions

Previously unreported increases in splenic volume and bone marrow hyperplasia are observed on WB-MRI in patients on T-DM1 therapy. Caution must be applied to avoid misinterpreting T-DM1-induced bone marrow hyperplasia as diffuse disease progression in bone.

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Correspondence to Michael Kosmin.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

This article does not contain any studies with animals performed by any of the authors.

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The authors declare that they have no conflicts of interest.

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Kosmin, M., Makris, A., Jawad, N. et al. Splenic Enlargement and Bone Marrow Hyperplasia in Patients Receiving Trastuzumab-Emtansine for Metastatic Breast Cancer. Targ Oncol 12, 229–234 (2017). https://doi.org/10.1007/s11523-017-0477-6

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  • DOI: https://doi.org/10.1007/s11523-017-0477-6

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