Abstract
Purpose
The role of neoadjuvant chemotherapy (NAC) in node-positive (N+) ER+/HER2- breast cancer (BC) is debated, given low total pathologic complete response (pCR) rates. However, the rate and impact of nodal pCR is unknown. We sought to evaluate nodal pCR rates and the impact on overall survival (OS). Further, we sought to validate the association between nodal pCR with age and Ki67.
Methods
We queried the National Cancer Database for cN + ER+/HER2- BC patients treated with NAC and surgery. Data from 2010 to 2018 were used to evaluate nodal pCR and OS, with multivariable Cox proportional hazards modeling for OS, as well as Ki67 for the years 2018–2019.
Results
From 2010 to 2018, we identified 19,611 cN + ER+/HER2- BC patients treated with NAC. While total pCR occurred in only 7.4%, nodal pCR rates were nearly double (14.3%). Nodal pCR (+/- breast pCR) was seen in 21.7% and associated with 5-year OS rate of 86.1% (95% CI: 84.9–87.4%) versus 77.1% (95% CI: 76.3–77.9%) in patients without nodal pCR (p < 0.001). On multivariable analysis, nodal pCR had better OS (adjusted HR 0.57, 95% CI 0.52–0.63, p < 0.001) across all age groups. Of 2,444 patients with available Ki67, those with age < 50 and Ki67 ≥ 20% had the highest nodal pCR at 31.6%.
Conclusion
In cN + ER+/HER2- BC treated with NAC, nodal pCR is common, associated with age and Ki67, and prognostic for OS. These data strongly suggest that for cN + patients, eradication of nodal disease is critical for OS, and total pCR may not be the optimal measure of NAC benefit.
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Data Availability
The datasets analysed during the current study are available in the National Cancer Database repository and available to Commission on Cancer sites by application to the NCDB.
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Funding
This work was supported in part by the Mayo Clinic Breast Cancer Specialized Program of Research Excellence Grant, National Institutes of Health (P50CA 116201) (MPG) and the George M. Eisenberg Foundation for Charities (to MPG, JCB).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Judy Boughey, Tanya Hoskin, Courtney Day, Dan Moldoveanu and Matthew Goetz. The first draft of the manuscript was written by Dan Moldoveanu and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Dr. Boughey receives research support paid to her institution from Eli Lilly and SymBioSis and is on a DSMB for CairnsSurgical. She has received honoraria for speaking for PER, PeerView, EndoMag and contributed a chapter to UpToDate. Dr. Goetz reports personal fees for CME activities from Research to Practice, Clinical Education Alliance, Medscape, and MJH Life Sciences; personal fees for serving as a panelist on a panel discussion from Total Health Conferencing and personal fees for serving as a moderator for Curio Science; consulting fees to Mayo Clinic from ARC Therapeutics, AstraZeneca, Biotheranostics, Blueprint Medicines, Lilly, RNA Diagnostics, Sanofi Genzyme, and Seattle Genetics; and grant funding to Mayo Clinic from Lilly, Pfizer, SymBioSis, Sermonix, Atossa, and AstraZeneca.
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Presentation: This work was presented as a poster presentation at the San Antonio Breast Cancer Symposium on December 6–10, 2022, and as a poster presentation at the Society of Surgical Oncology Annual Meeting on March 22–25, 2023.
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Moldoveanu, D., Hoskin, T.L., Day, C.N. et al. Nodal pCR and overall survival following neoadjuvant chemotherapy for node positive ER+/Her2- breast cancer. Breast Cancer Res Treat 203, 419–428 (2024). https://doi.org/10.1007/s10549-023-07152-2
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DOI: https://doi.org/10.1007/s10549-023-07152-2