Abstract
Purpose
Breast cancer (BC) is a leading cause of morbidity, disability, and mortality in women, worldwide; triple-negative BC (TNBC) is a subtype traditionally associated with poorer prognosis. TNBC special histology subtypes present distinct clinical and molecular features and sensitivity to antineoplastic treatments. However, no consensus has been defined on the best adjuvant therapy. The aim of the review is to study the evidence from literature to inform the choice of adjuvant treatments in this setting.
Methods
We systematically searched literature assessing the benefit of adjuvant chemotherapy in patients with TNBC special histotypes (PROSPERO: CRD42020153818).
Results
We screened 6404 records (15 included). All the studies estimated the benefit of different chemotherapy regimens, in retrospective cohorts (median size: 69 patients (range min–max: 17–5142); median follow-up: 51 months (range: 21–268); mostly in Europe and USA). In patients with early-stage adenoid cystic TNBC, a marginal role of chemotherapy was reported. Similar for apocrine TNBC. Medullary tumors exhibited an intrinsic good prognosis with a limited role of chemotherapy, suggested to be modulated by the presence of tumor-infiltrating lymphocytes. A significant impact of chemotherapy on the overall survival was estimated in patients with metaplastic TNBC. Limitations were related to the retrospective design of all the studies and heterogeneous treatments received by the patients.
Conclusions
There is potential opportunity to consider treatment de-escalation and less intense therapies in some patients with early, special histology-type TNBC. International efforts are indispensable to validate prospective clinical decision models.
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Abbreviations
- BC:
-
Breast Cancer
- DFS:
-
Disease-Free Survival
- HER2:
-
Human Epidermal Growth Factor Receptor 2
- HR:
-
Hormone Receptor
- NOS:
-
Not Otherwise Specified
- NST:
-
No Special Type
- OS:
-
Overall Survival
- PRISMA:
-
Preferred Reporting Items for Systematic Reviews and Meta-Analyses
- TILs:
-
Tumor-Infiltrating Lymphocytes
- TNBC:
-
Triple-Negative Breast Cancer
- WHO:
-
World Health Organization
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This work was partially supported by the Italian Ministry of Health with Ricerca Corrente and 5 × 1000 funds.
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Conceptualization (GC), Data curation (FG, JU, VZ, DT, GC), Formal Analysis (GC, DT), Investigation (DT, FG, JU, VZ, GC), Methodology (VZ, EF, DT, AM, GV, PD, CC, GC), Project administration (GC), Resources (GC, DT), Supervision (GC), Validation (DT, GC), Visualization (FG, JU, EF), Writing—original draft (all the authors), Writing—review & editing of the final draft (all the authors).
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GF, UJ, AM, EF, GV, DT, PD, EA declare no potential COI. GC has received honoraria from Pfizer, Novartis, Lilly, Roche; fees for expert testimony and medical education from Pfizer; and has participated in advisory board s for Pfizer, Roche, Lilly, Novartis, Seattle Genetics, Celltrion. All the declarations are outside the submitted work. CC, received honoraria for speaker bureau, consultancy or advisory role from Roche, Novartis, Pfizer, Eli-Lilly, and MSD. VAAZ is also employee from Takeda Oncology. No COI in this submitted work.
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Trapani, D., Giugliano, F., Uliano, J. et al. Benefit of adjuvant chemotherapy in patients with special histology subtypes of triple-negative breast cancer: a systematic review. Breast Cancer Res Treat 187, 323–337 (2021). https://doi.org/10.1007/s10549-021-06259-8
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DOI: https://doi.org/10.1007/s10549-021-06259-8