Cited by 188Gut microbiota and healthCancer Immunotherapy and BiomarkersHER2/EGFR in Cancer Research

Gut Microbiota Condition the Therapeutic Efficacy of Trastuzumab in HER2-Positive Breast Cancer

Open access
Di Modica, Martina, Gargari, Giorgio, Regondi, Viola, Bonizzi, Arianna, Arioli, Stefania, Belmonte, Beatrice, De Cecco, Loris, Fasano, Elena +9 more·2021·Cancer Research

Published version of a preprint

Abstract

Abstract Emerging evidence indicates that gut microbiota affect the response to anticancer therapies by modulating the host immune system. In this study, we investigated the impact of gut microbiota on immune-mediated trastuzumab antitumor efficacy in preclinical models of HER2-positive breast cancer and in 24 patients with primary HER2-positive breast cancer undergoing trastuzumab-containing neoadjuvant treatment. In mice, the antitumor activity of trastuzumab was impaired by antibiotic administration or fecal microbiota transplantation from antibiotic-treated donors. Modulation of the intestinal microbiota was reflected in tumors by impaired recruitment of CD4+ T cells and granzyme B–positive cells after trastuzumab treatment. Antibiotics caused reductions in dendritic cell (DC) activation and the release of IL12p70 upon trastuzumab treatment, a mechanism that was necessary for trastuzumab effectiveness in our model. In patients, lower α-diversity and lower abundance of Lachnospiraceae, Turicibacteraceae, Bifidobacteriaceae, and Prevotellaceae characterized nonresponsive patients (NR) compared with those who achieved pathologic complete response (R), similar to antibiotic-treated mice. The transfer of fecal microbiota from R and NR into mice bearing HER2-positive breast cancer recapitulated the response to trastuzumab observed in patients. Fecal microbiota β-diversity segregated patients according to response and positively correlated with immune signature related to interferon (IFN) and NO2-IL12 as well as activated CD4+ T cells and activated DCs in tumors. Overall, our data reveal the direct involvement of the gut microbiota in trastuzumab efficacy, suggesting that manipulation of the gut microbiota is an optimal future strategy to achieve a therapeutic effect or to exploit its potential as a biomarker for treatment response. Significance: Evidence of gut microbiota involvement in trastuzumab efficacy represents the foundation for new therapeutic strategies aimed at manipulating commensal bacteria to improve response in trastuzumab-resistant patients. See related commentary by Sharma, p. 1937

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1158/0008-5472.can-20-1659

Cites

53 of 53 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • In breast cancer, high baseline gut microbiota alpha diversity has been associated with response to both neoadjuvant HER2 blockade and neoadjuvant chemotherapy.

    “In breast cancer, high baseline gut microbiota alpha diversity has been associated with response to both neoadjuvant HER2 blockade and neoadjuvant chemotherapy [8, 12].”
  • Lachnospiraceae, Turicibacteraceae, and Prevotellaceae are more abundant in breast cancer patients achieving pathologic complete responses to trastuzumab-containing regimens.

    “Additionally, families like Lachnospiraceae, Turicibacteraceae, and Prevotellaceae are more abundant in breast cancer patients achieving pathologic complete responses to trastuzumab-containing regimens (Di Modica et al., 2021).”

    From Microbiota-centered interventions to boost immune checkpoint blockade therapies (2025) · cites this paper as Di Modica et al., 2021

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

1 of the 54 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Di Modica, M., Gargari, G., Regondi, V., Bonizzi, A., Arioli, S., Belmonte, B., De Cecco, L., Fasano, E., Bianchi, F., Bertolotti, A., Tripodo, C., Villani, L., Corsi, F., Guglielmetti, S., Balsari, A., Triulzi, T., & Tagliabue, E.
Affiliations
  • 1Molecular Targeting Unit, Department of Research, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
  • Fondazione IRCCS Istituto Nazionale dei Tumori (IT)
  • University of Milan (IT)
  • University of Palermo (IT)
  • 5Platform of Integrated Biology, Department of Applied Research and Technology Development, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
  • IFOM (IT)
  • Istituti Clinici Scientifici Maugeri (IT)
Corresponding author
Tagliabue, Elda
Venue
Cancer Research
Published
2021-01-22
Volume
81
Issue
8
Pages
2195-2206
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W3122301327
Cited by
184
References
54
Citations by year
2026: 29 · 2025: 42 · 2024: 45 · 2023: 38 · 2022: 23 · 2021: 7
FWCI
9.18
Type
journal article
Language
en
Open access
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
  • Archivio Istituzionale della Ricerca (Universita Degli Studi Di Milano) (submittedVersion, other-oa)
  • BOA (University of Milano-Bicocca) (submittedVersion)
  • Nova Science Publishers (Nova Science Publishers, Inc.) (submittedVersion)
Funders
  • AIRC (IG 2017, ID. 20264)
  • FIRC-AIRC fellowship (ID. 22304)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Oncology › Cancer Immunotherapy and Biomarkers
  • Health Sciences › Medicine › Oncology › HER2/EGFR in Cancer Research
Keywords
gut microbiota, trastuzumab, HER2-positive breast cancer, antibiotic-induced dysbiosis, fecal microbiota transplantation, neoadjuvant therapy, treatment response biomarkers, dendritic cell activation, IL-12, CD4+ T cells, interferon signature, microbiome diversity, trastuzumab resistance, immunotherapy
MeSH terms
Trastuzumab, Gastrointestinal Microbiome, Fecal Microbiota Transplantation, Antineoplastic Agents, Immunological, Animals, Anti-Bacterial Agents, Breast Neoplasms, Bridged-Ring Compounds, Cyclophosphamide, Dendritic Cells, Doxorubicin, Female, Humans, Immune System, Interferons, Nitric Oxide, Streptomycin, Vancomycin, CD4-Positive T-Lymphocytes, Cytokines, Treatment Outcome, Interleukin-12, Erb-b2 Receptor Tyrosine Kinases, Immunity, Mucosal, Neoadjuvant Therapy, Taxoids, Mice, Granzymes, Tumor Microenvironment

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review