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Stemmer A, Margalit O, Serpas V, Strauss G, Thomas J, Shah P, Tau N, Levanon K, Shacham-Shmueli E, Kopetz S, Overman M, Boursi B. Immunotherapy in mismatch repair-deficient metastatic colorectal cancer - Outcome and novel predictive markers. Eur J Cancer 2024; 198:113495. [PMID: 38157568 DOI: 10.1016/j.ejca.2023.113495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 12/01/2023] [Accepted: 12/08/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND This study aims to assess predictive markers for response to immunotherapy in dMMR/MSI-H metastatic colorectal cancer (mCRC) patients. MATERIALS AND METHODS A study using two prospective cohorts from MD Anderson Cancer Center and Sheba Medical Center of consecutive patients with dMMR/MSI-H mCRC that were treated with immunotherapy between 2014-2022. Primary outcome was progression-free survival (PFS) and secondary outcome was overall response rate (ORR). Evaluated predictors included ECOG-PS score, RAS/BRAF status, single-agent versus doublet immunotherapy, metastatic sites, disease burden, and CEA levels prior to treatment initiation. Kaplan-Meier analysis and Cox proportional hazard regression model were used to analyze the effect of exposure variables on PFS. RESULTS The study included 153 patients. Median follow-up time was 26 months (IQR 11-48). Median PFS was 51.6 months (95%CI 38.1-NR) and ORR was 58.1%. In a univariate analysis, male sex was associated with worse PFS with a HR of 1.67 (95% CI 1.00-2.79); Right-sided tumors were associated with improved PFS with a HR of 0.56 (95% CI 0.32-0.97); Liver or lung metastasis were associated with worse PFS with HRs of 2.35 (95%CI 1.43-3.88) and 2.30 (95%CI 1.31-4.04), respectively; ECOG-PS score ≥ 2, CEA levels ˃5 μg/L prior to treatment initiation and ≥ 3 metastatic sites were associated with worse PFS with HRs of 2.09 (95%CI 0.98-4.47), 2.23 (95%CI 1.30-3.81) and 3.11 (95%CI 1.61-6.03), respectively. Liver or lung metastasis remained significant in a multivariable model. CONCLUSIONS Extent of disease (worse PFS with high CEA, poor ECOG-PS and ≥3 metastatic sites) and disease location (worse PFS with liver or lung metastasis and left sided tumor) were associated with immunotherapy outcome in dMMR/MSI-H mCRC.
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Affiliation(s)
- Amos Stemmer
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel.
| | - Ofer Margalit
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Victoria Serpas
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Gal Strauss
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Jane Thomas
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Preksha Shah
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Noam Tau
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Keren Levanon
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Einat Shacham-Shmueli
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Scott Kopetz
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Michael Overman
- University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ben Boursi
- Department of Oncology, Sheba Medical Center, Tel-Hashomer, Israel; Tel-Aviv University, Tel-Aviv, Israel; Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
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