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Mazzeo R, Bortot L, Michelotti A, Buriolla S, Palmero L, Franzoni A, Bertoli E, Targato G, Allegri L, Da Ros L, Alberti M, Di Nardo P, Bonotto M, Sodde S, Belletti B, Spazzapan S, Baldassarre G, Damante G, Gerratana L, Puglisi F. Liquid biopsy for baseline evaluation of tumor burden in patients with hormone receptor-positive, HER2-negative metastatic breast cancer: A proof of principle study. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.15_suppl.e13008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e13008 Background: Liquid biopsy-based biomarkers, including circulating tumor DNA (ctDNA), are increasingly important for the characterization of metastatic breast cancer (MBC). Currently, CA15.3 is the most commonly used serum marker for monitoring disease burden. To date, no liquid biopsy-based biomarkers have been proposed for this scope in clinical practice. Methods: The CRO-2018-56 multicenter study prospectively enrolled 83 patients (pts) with luminal-like MBC treated with first line endocrine therapy (ET) and CDK4/6 inhibitors. All pts were characterized for ctDNA through droplet digital PCR (ddPCR) in from 2018 to 2021. Clinicopathological and laboratory characteristics at baseline were tested for associations with tumor markers, ACTB fragments lengths, methylation status of ESR1 main promoters (expressed as promA and promB ratio, i.e., met_ratio) and ESR1/PIK3CA mutational status through Kruskal-Wallis test and Chi-square test. Prognosis was tested in terms of Progression Free Survival (PFS) and Overall Survival (OS) through log-rank test. Results: At baseline, in 26 (31%) pts disease was diagnosed as de novo metastatic, 66 (80%) pts had < 3 of metastatic sites, and 41 (49%) pts had < 5 of metastatic lesions. Bone metastases were detected in 53 (64%) pts, liver metastases in 21 (25%) pts, and lung lesions in 30 (36%) pts. A ctDNA-detected ESR1 mutation and a PIK3CA mutation were found in 15% of pts and in 34% pts, respectively. Met_ratio was > 1.5 in 35 (42%) of pts. Median CA15.3 was 48.2 U/mL and median CEA was 3.8 U/mL. Number of liver metastases and number of metastatic sites were significantly higher in pts with ESR1 mutation (respectively, P = 0.0055 and P = 0.0208). CA15.3 and ctDNA yield were significantly higher in pts with number of metastatic sites ≥ 3, (respectively, P = 0.0164, and P = 0.0239), while number of metastatic sites ≥ 3 and number of metastatic lesions ≥ 5 were significantly associated with CEA > 3.8 U/mL (respectively, P = 0.039, and P = 0.029). Presence of bone metastases was significantly associated with PIK3CA mutation (P = 0.040), while number of metastatic sites ≥ 3 was significantly associated with ESR1 mutation (P = 0.022). No association with tumor burden was observed for different ACTB DNA fragments lengths. Met_ratio > 1.5 was significantly associated with lower number of metastatic lesions (P = 0.031). Number of metastatic sites ≥ 3, high ctDNA yield and CEA were associated with worse OS (respectively P = 0.0465, P = 0.0250 and P = 0.0474), while only CEA impacted on PFS (P = 0.0097). Conclusions: In pts with luminal-like MBC, some liquid biopsy-based biomarkers (i.e., ctDNA-detected ESR1 and PIK3CA mutations, ctDNA yield) were significantly associated with the burden of disease. The potential clinical validity and utility of these results deserve to be tested in an expansion cohort.
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Affiliation(s)
- Roberta Mazzeo
- Department of Medical Area, University of Udine; Department of Medical Oncology, IRCCS, CRO of Aviano, Udine, Italy
| | - Lucia Bortot
- Department of Medicine (DAME), University of Udine, Udine, Italy
| | - Anna Michelotti
- Department of Medical Area, University of Udine; Department of Medical Oncology, IRCCS, CRO of Aviano, Udine, Italy
| | - Silvia Buriolla
- Department of Medicine (DAME), University of Udine; Dipartimento di Oncologia Medica, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Udine, Italy
| | - lorenza Palmero
- Department of Medical Area, University of Udine; Department of Medical Oncology, IRCCS, CRO of Aviano, Udine, Italy
| | - Alessandra Franzoni
- Institute of Human Genetics, Azienda Sanitaria Universitaria Friuli Centrale (ASUFC), Udine, Italy
| | - Elisa Bertoli
- Department of Medicine (DAME) - University of Udine, Udine, Italy
| | - Giada Targato
- Department of Oncology, ASUFC Santa Maria della Misericordia University Hospital; Department of Medicine (DAME), University of Udine, Udine, Italy
| | - Lorenzo Allegri
- Department of Medicine (DAME) - University of Udine, Udine, Italy
| | - Lucia Da Ros
- Dipartimento di Oncologia Medica, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Martina Alberti
- Department of Medicine (DAME), University of Udine, Udine, Italy
| | - Paola Di Nardo
- Dipartimento di Oncologia Medica, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Marta Bonotto
- Department of Oncology, University Hospital of Udine, Udine, Italy
| | - Sara Sodde
- Clinical Trial Office, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Barbara Belletti
- Unit of Molecular Oncology, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Simon Spazzapan
- Dipartimento di Oncologia Medica, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Gustavo Baldassarre
- Unit of Molecular Oncology, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Aviano, Italy
| | - Giuseppe Damante
- Università di Udine, Institute of Human Genetics, Azienda Sanitaria Universitaria Friuli Centrale (ASUFC) Udine, Udine, Italy
| | - Lorenzo Gerratana
- Department of Medicine-Hematology and Oncology, Feinberg School of Medicine, Northwestern University; Department of Medicine (DAME), University of Udine, Chicago, IL
| | - Fabio Puglisi
- Department of Medicine (DAME), University of Udine; Dipartimento di Oncologia Medica, Centro di Riferimento Oncologico di Aviano (CRO), IRCCS, Udine, Italy
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