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The introduction over the last decade of new systemic therapies for the treatment of hormone receptor positive, HER2-negative metastatic breast cancer has not translated into improved survival in a real-world setting, results of a retrospective study suggest.
Among 2,197 patients who received at least one line of systemic therapy for hormone receptor positive, HER2-negative metastatic breast cancer (HR+/HER2– MBC) from 2003 to 2013, there were no significant differences in median duration of hormonal therapy or median overall survival (OS) for patients treated in any of three time spans during that 10-year period, reported Dan Le, MD, MHA, of BC Cancer, Surrey, B.C., and colleagues.
“Despite the introduction of 9 new adjuvant therapies and 2 new metastatic treatments, survival in the metastatic setting for HR-positive, HER2-negative breast cancer did not improve between 2003 and 2013,” they wrote in a report published in Cancer.
Improvements in adjuvant therapy such as the introduction of cyclin-dependent kinase inhibitors (CDKI) may result in fewer relapses but may also affect the response of relapsed cancers to additional lines of therapy, the authors contended.
“Improved adjuvant therapy means that the cancers that do relapse may have more adverse biology, either intrinsically or because of selective pressure and clonal evolution from exposure to more and better drugs in the adjuvant setting. These factors could, in part, explain the lack of improved survival over time observed in this study,” they wrote.
To see whether significant increases in progression-free survival (PFS) in a clinical trial translated into improved outcomes – including OS – in population-based settings, the investigators identified 2,432 patients with HR+/HER2– MBC from data in the prospective Breast Cancer Outcomes Unit Database of BC Cancer. Of this group, 2,197 received at least one line of systemic therapy after an MBC diagnosis, and 1,752 received first and/or second-line hormonal therapy as well.
The patients were treated in one of three time cohorts: from 2003 through 2005, 2007 through 2009, or 2011 through 2013.
Nine new adjuvant systemic therapies with or without neoadjuvant therapy were approved by BC Cancer during the study period. For the entire decade of the study, the mean survival time was 3.1 years, and the median OS was 2.0 years.
The longest survival for patients diagnosed from 2003 through 2005 was 14.6 years, with 18.1% of these patients living at least 5 years after diagnosis. For patients diagnosed from 2007 through 2009, the longest survival was 10.6 years, with 17.7% of these patients living 5 years or longer post diagnosis. For patients in the most recent cohort (with patients diagnosed after August 2012 excluded), the longest survival was 6.6 years, with 17.3% living at least 5 years after diagnosis.
Overall, patients had a median of 9 months of first-line hormonal treatment, and 6.1 months of second-line hormonal therapy, with nearly identical duration across all three time cohorts.
“Ultimately, it seems likely that the greater the proportion of patients we cure with modern adjuvant therapy, the more challenging it will be to improve outcomes for patients with relapsed disease. This underscores the importance of 1) making continued progress in the adjuvant management of potentially curable breast cancer by first studying new therapeutic agents in the metastatic setting and 2) developing a better understanding of how selective pressure and clonal evolution may lead to more resistant biologic phenotypes in MBC,” the investigators wrote.
No specific study funding was disclosed. No authors disclosed potential conflicts of interest.
SOURCE: Le D et al. Cancer 2019 Nov 21. doi: 10.1002/cncr.32631.
The introduction over the last decade of new systemic therapies for the treatment of hormone receptor positive, HER2-negative metastatic breast cancer has not translated into improved survival in a real-world setting, results of a retrospective study suggest.
Among 2,197 patients who received at least one line of systemic therapy for hormone receptor positive, HER2-negative metastatic breast cancer (HR+/HER2– MBC) from 2003 to 2013, there were no significant differences in median duration of hormonal therapy or median overall survival (OS) for patients treated in any of three time spans during that 10-year period, reported Dan Le, MD, MHA, of BC Cancer, Surrey, B.C., and colleagues.
“Despite the introduction of 9 new adjuvant therapies and 2 new metastatic treatments, survival in the metastatic setting for HR-positive, HER2-negative breast cancer did not improve between 2003 and 2013,” they wrote in a report published in Cancer.
Improvements in adjuvant therapy such as the introduction of cyclin-dependent kinase inhibitors (CDKI) may result in fewer relapses but may also affect the response of relapsed cancers to additional lines of therapy, the authors contended.
“Improved adjuvant therapy means that the cancers that do relapse may have more adverse biology, either intrinsically or because of selective pressure and clonal evolution from exposure to more and better drugs in the adjuvant setting. These factors could, in part, explain the lack of improved survival over time observed in this study,” they wrote.
To see whether significant increases in progression-free survival (PFS) in a clinical trial translated into improved outcomes – including OS – in population-based settings, the investigators identified 2,432 patients with HR+/HER2– MBC from data in the prospective Breast Cancer Outcomes Unit Database of BC Cancer. Of this group, 2,197 received at least one line of systemic therapy after an MBC diagnosis, and 1,752 received first and/or second-line hormonal therapy as well.
The patients were treated in one of three time cohorts: from 2003 through 2005, 2007 through 2009, or 2011 through 2013.
Nine new adjuvant systemic therapies with or without neoadjuvant therapy were approved by BC Cancer during the study period. For the entire decade of the study, the mean survival time was 3.1 years, and the median OS was 2.0 years.
The longest survival for patients diagnosed from 2003 through 2005 was 14.6 years, with 18.1% of these patients living at least 5 years after diagnosis. For patients diagnosed from 2007 through 2009, the longest survival was 10.6 years, with 17.7% of these patients living 5 years or longer post diagnosis. For patients in the most recent cohort (with patients diagnosed after August 2012 excluded), the longest survival was 6.6 years, with 17.3% living at least 5 years after diagnosis.
Overall, patients had a median of 9 months of first-line hormonal treatment, and 6.1 months of second-line hormonal therapy, with nearly identical duration across all three time cohorts.
“Ultimately, it seems likely that the greater the proportion of patients we cure with modern adjuvant therapy, the more challenging it will be to improve outcomes for patients with relapsed disease. This underscores the importance of 1) making continued progress in the adjuvant management of potentially curable breast cancer by first studying new therapeutic agents in the metastatic setting and 2) developing a better understanding of how selective pressure and clonal evolution may lead to more resistant biologic phenotypes in MBC,” the investigators wrote.
No specific study funding was disclosed. No authors disclosed potential conflicts of interest.
SOURCE: Le D et al. Cancer 2019 Nov 21. doi: 10.1002/cncr.32631.
The introduction over the last decade of new systemic therapies for the treatment of hormone receptor positive, HER2-negative metastatic breast cancer has not translated into improved survival in a real-world setting, results of a retrospective study suggest.
Among 2,197 patients who received at least one line of systemic therapy for hormone receptor positive, HER2-negative metastatic breast cancer (HR+/HER2– MBC) from 2003 to 2013, there were no significant differences in median duration of hormonal therapy or median overall survival (OS) for patients treated in any of three time spans during that 10-year period, reported Dan Le, MD, MHA, of BC Cancer, Surrey, B.C., and colleagues.
“Despite the introduction of 9 new adjuvant therapies and 2 new metastatic treatments, survival in the metastatic setting for HR-positive, HER2-negative breast cancer did not improve between 2003 and 2013,” they wrote in a report published in Cancer.
Improvements in adjuvant therapy such as the introduction of cyclin-dependent kinase inhibitors (CDKI) may result in fewer relapses but may also affect the response of relapsed cancers to additional lines of therapy, the authors contended.
“Improved adjuvant therapy means that the cancers that do relapse may have more adverse biology, either intrinsically or because of selective pressure and clonal evolution from exposure to more and better drugs in the adjuvant setting. These factors could, in part, explain the lack of improved survival over time observed in this study,” they wrote.
To see whether significant increases in progression-free survival (PFS) in a clinical trial translated into improved outcomes – including OS – in population-based settings, the investigators identified 2,432 patients with HR+/HER2– MBC from data in the prospective Breast Cancer Outcomes Unit Database of BC Cancer. Of this group, 2,197 received at least one line of systemic therapy after an MBC diagnosis, and 1,752 received first and/or second-line hormonal therapy as well.
The patients were treated in one of three time cohorts: from 2003 through 2005, 2007 through 2009, or 2011 through 2013.
Nine new adjuvant systemic therapies with or without neoadjuvant therapy were approved by BC Cancer during the study period. For the entire decade of the study, the mean survival time was 3.1 years, and the median OS was 2.0 years.
The longest survival for patients diagnosed from 2003 through 2005 was 14.6 years, with 18.1% of these patients living at least 5 years after diagnosis. For patients diagnosed from 2007 through 2009, the longest survival was 10.6 years, with 17.7% of these patients living 5 years or longer post diagnosis. For patients in the most recent cohort (with patients diagnosed after August 2012 excluded), the longest survival was 6.6 years, with 17.3% living at least 5 years after diagnosis.
Overall, patients had a median of 9 months of first-line hormonal treatment, and 6.1 months of second-line hormonal therapy, with nearly identical duration across all three time cohorts.
“Ultimately, it seems likely that the greater the proportion of patients we cure with modern adjuvant therapy, the more challenging it will be to improve outcomes for patients with relapsed disease. This underscores the importance of 1) making continued progress in the adjuvant management of potentially curable breast cancer by first studying new therapeutic agents in the metastatic setting and 2) developing a better understanding of how selective pressure and clonal evolution may lead to more resistant biologic phenotypes in MBC,” the investigators wrote.
No specific study funding was disclosed. No authors disclosed potential conflicts of interest.
SOURCE: Le D et al. Cancer 2019 Nov 21. doi: 10.1002/cncr.32631.
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