User login
SAN ANTONIO – compared with White women, a discovery that may at least partially explain racial differences in breast cancer outcomes, investigators say.
The finding, which comes from a retrospective study comparing differences in tumor microenvironment of metastasis (TMEM) “doorways” between Black and White women suggest that tumors in Black women may have a stronger prometastatic response to neoadjuvant chemotherapy than tumors in White women, reported Maja H. Oktay, MD, PhD, of Montefiore Einstein Cancer Center, Albert Einstein College of Medicine, New York, at the San Antonio Breast Cancer Symposium.
“Looking forward ... we propose to use TMEM doorway density as a prognostic marker for distant recurrence-free survival as a marker of dissemination, and also as a predictive marker of response to drugs that can block TMEM doorways,” she said at a briefing held prior to the presentation of data in an oral abstract session.
Entry points
As their name implies, TMEM doorways are transient entry points or portals that allow cancer cells to disseminate to distant sites. TMEM doorways are composed of tumor cells, macrophages, and endothelial cells that come into direct contact and together create temporary vascular openings that allow tumor cells to cross cell walls into circulation, where they can then hitch a ride and travel to distant organ sites.
Previous studies have shown that TMEM doorway density is a prognostic marker of metastasis in breast cancer patients treated with adjuvant chemotherapy. And as Dr. Oktay and colleagues showed in the current study, TMEM doorway density, as measured by a TMEM doorway score, is a prognostic marker for distant metastatic recurrence of ER+/HER2– breast cancer following neoadjuvant chemotherapy.
They also showed that neoadjuvant chemotherapy may increase the TMEM doorway score and lead to a pro–metastatic tumor microenvironment in some women.
Doorway scores
The investigators measured TMEM doorway scores from residual breast cancers in women who had undergone standard neoadjuvant chemotherapy. The cohort consisted of 96 Black women, 43 of whom had ER+/HER2– breast cancer and 37 of whom had triple-negative breast cancer (TNBC), and 87 White women, 50 with ER+/HER2– cancer and 22 with TNBC. The remaining patients had other breast cancer subtypes.
They found that TNBCs had higher TMEM doorway density score and higher macrophage density scores, which may explain why patients with TNBC often have early recurrence of disease.
They also found that, compared with White patients, Black patients with ER+/HER2– tumors, but not TNBC tumors, had higher TMEM doorway density scores. Similarly, Black patients with ER+/HER– cancers, but not TNBC, had higher macrophage levels than White women, a finding that may explain racial disparity in ER+/HER2– disease, Dr. Oktay said.
For the entire cohort, patients with high TMEM doorway density scores had significantly worse distant recurrence–free survival than patients with intermediate or low scores (P = .008), and there was a trend toward worse DRFS among all patients with ER+/HER2– who were in the highest third of scores, but this did not quite reach statistical significance.
High versus low TMEM doorway density score was also an independent prognostic factor for worse outcomes among the entire cohort (P = .01).
There was no significant difference in TMEM density scores among patients with TNBC.
Neither high macrophage counts nor microvascular density alone were significantly associated with inferior DRFS. TMEM doorway score was the only factor significantly prognostic for worse outcomes among patients in the entire cohort.
Hypothesis needs further testing
Invited discussant Lori Pierce, MD, a radiation oncologist with Michigan Medicine, University of Michigan, Ann Arbor, said it’s unclear whether TMEM doorway density changed following neoadjuvant chemotherapy as there were no prechemotherapy scores available in this study.
“But I think the key part is that, if we think neoadjuvant chemotherapy promotes metastasis, then there should be an inferior outcome compared to adjuvant chemotherapy, but that’s not what we see. Well-powered randomized trials show equivalent outcomes with neoadjuvant chemotherapy as well as adjuvant,” she said.
She noted that a 2018 meta-analysis of individual patient data from 10 randomized trials comparing neoadjuvant with adjuvant chemotherapy in early breast cancer showed no differences in long-term distant recurrences, breast cancer–specific mortality, or all-cause mortality between the two modalities.
“While I think these data are very provocative, I certainly wouldn’t want Black women or any women who need neoadjuvant therapy to be discouraged because of these data. We need these data to be tested rigorously, so I look forward to the clinical trials that will test this question and can really give us more information about this very interesting hypothesis,” Dr. Pierce said.
The study was funded by the National Institutes of Health, New York State Department of Health Peter T. Rowley Breast Cancer Scientific Research Projects, Helen & Irving Spatz Family Foundation, Evelyn Gruss Lipper Charitable Foundation, and the Gruss-Lipper Biophotonics Center and the integrated imaging program at the Albert Einstein College of Medicine. Dr. Oktay reported no conflicts of interests.
SAN ANTONIO – compared with White women, a discovery that may at least partially explain racial differences in breast cancer outcomes, investigators say.
The finding, which comes from a retrospective study comparing differences in tumor microenvironment of metastasis (TMEM) “doorways” between Black and White women suggest that tumors in Black women may have a stronger prometastatic response to neoadjuvant chemotherapy than tumors in White women, reported Maja H. Oktay, MD, PhD, of Montefiore Einstein Cancer Center, Albert Einstein College of Medicine, New York, at the San Antonio Breast Cancer Symposium.
“Looking forward ... we propose to use TMEM doorway density as a prognostic marker for distant recurrence-free survival as a marker of dissemination, and also as a predictive marker of response to drugs that can block TMEM doorways,” she said at a briefing held prior to the presentation of data in an oral abstract session.
Entry points
As their name implies, TMEM doorways are transient entry points or portals that allow cancer cells to disseminate to distant sites. TMEM doorways are composed of tumor cells, macrophages, and endothelial cells that come into direct contact and together create temporary vascular openings that allow tumor cells to cross cell walls into circulation, where they can then hitch a ride and travel to distant organ sites.
Previous studies have shown that TMEM doorway density is a prognostic marker of metastasis in breast cancer patients treated with adjuvant chemotherapy. And as Dr. Oktay and colleagues showed in the current study, TMEM doorway density, as measured by a TMEM doorway score, is a prognostic marker for distant metastatic recurrence of ER+/HER2– breast cancer following neoadjuvant chemotherapy.
They also showed that neoadjuvant chemotherapy may increase the TMEM doorway score and lead to a pro–metastatic tumor microenvironment in some women.
Doorway scores
The investigators measured TMEM doorway scores from residual breast cancers in women who had undergone standard neoadjuvant chemotherapy. The cohort consisted of 96 Black women, 43 of whom had ER+/HER2– breast cancer and 37 of whom had triple-negative breast cancer (TNBC), and 87 White women, 50 with ER+/HER2– cancer and 22 with TNBC. The remaining patients had other breast cancer subtypes.
They found that TNBCs had higher TMEM doorway density score and higher macrophage density scores, which may explain why patients with TNBC often have early recurrence of disease.
They also found that, compared with White patients, Black patients with ER+/HER2– tumors, but not TNBC tumors, had higher TMEM doorway density scores. Similarly, Black patients with ER+/HER– cancers, but not TNBC, had higher macrophage levels than White women, a finding that may explain racial disparity in ER+/HER2– disease, Dr. Oktay said.
For the entire cohort, patients with high TMEM doorway density scores had significantly worse distant recurrence–free survival than patients with intermediate or low scores (P = .008), and there was a trend toward worse DRFS among all patients with ER+/HER2– who were in the highest third of scores, but this did not quite reach statistical significance.
High versus low TMEM doorway density score was also an independent prognostic factor for worse outcomes among the entire cohort (P = .01).
There was no significant difference in TMEM density scores among patients with TNBC.
Neither high macrophage counts nor microvascular density alone were significantly associated with inferior DRFS. TMEM doorway score was the only factor significantly prognostic for worse outcomes among patients in the entire cohort.
Hypothesis needs further testing
Invited discussant Lori Pierce, MD, a radiation oncologist with Michigan Medicine, University of Michigan, Ann Arbor, said it’s unclear whether TMEM doorway density changed following neoadjuvant chemotherapy as there were no prechemotherapy scores available in this study.
“But I think the key part is that, if we think neoadjuvant chemotherapy promotes metastasis, then there should be an inferior outcome compared to adjuvant chemotherapy, but that’s not what we see. Well-powered randomized trials show equivalent outcomes with neoadjuvant chemotherapy as well as adjuvant,” she said.
She noted that a 2018 meta-analysis of individual patient data from 10 randomized trials comparing neoadjuvant with adjuvant chemotherapy in early breast cancer showed no differences in long-term distant recurrences, breast cancer–specific mortality, or all-cause mortality between the two modalities.
“While I think these data are very provocative, I certainly wouldn’t want Black women or any women who need neoadjuvant therapy to be discouraged because of these data. We need these data to be tested rigorously, so I look forward to the clinical trials that will test this question and can really give us more information about this very interesting hypothesis,” Dr. Pierce said.
The study was funded by the National Institutes of Health, New York State Department of Health Peter T. Rowley Breast Cancer Scientific Research Projects, Helen & Irving Spatz Family Foundation, Evelyn Gruss Lipper Charitable Foundation, and the Gruss-Lipper Biophotonics Center and the integrated imaging program at the Albert Einstein College of Medicine. Dr. Oktay reported no conflicts of interests.
SAN ANTONIO – compared with White women, a discovery that may at least partially explain racial differences in breast cancer outcomes, investigators say.
The finding, which comes from a retrospective study comparing differences in tumor microenvironment of metastasis (TMEM) “doorways” between Black and White women suggest that tumors in Black women may have a stronger prometastatic response to neoadjuvant chemotherapy than tumors in White women, reported Maja H. Oktay, MD, PhD, of Montefiore Einstein Cancer Center, Albert Einstein College of Medicine, New York, at the San Antonio Breast Cancer Symposium.
“Looking forward ... we propose to use TMEM doorway density as a prognostic marker for distant recurrence-free survival as a marker of dissemination, and also as a predictive marker of response to drugs that can block TMEM doorways,” she said at a briefing held prior to the presentation of data in an oral abstract session.
Entry points
As their name implies, TMEM doorways are transient entry points or portals that allow cancer cells to disseminate to distant sites. TMEM doorways are composed of tumor cells, macrophages, and endothelial cells that come into direct contact and together create temporary vascular openings that allow tumor cells to cross cell walls into circulation, where they can then hitch a ride and travel to distant organ sites.
Previous studies have shown that TMEM doorway density is a prognostic marker of metastasis in breast cancer patients treated with adjuvant chemotherapy. And as Dr. Oktay and colleagues showed in the current study, TMEM doorway density, as measured by a TMEM doorway score, is a prognostic marker for distant metastatic recurrence of ER+/HER2– breast cancer following neoadjuvant chemotherapy.
They also showed that neoadjuvant chemotherapy may increase the TMEM doorway score and lead to a pro–metastatic tumor microenvironment in some women.
Doorway scores
The investigators measured TMEM doorway scores from residual breast cancers in women who had undergone standard neoadjuvant chemotherapy. The cohort consisted of 96 Black women, 43 of whom had ER+/HER2– breast cancer and 37 of whom had triple-negative breast cancer (TNBC), and 87 White women, 50 with ER+/HER2– cancer and 22 with TNBC. The remaining patients had other breast cancer subtypes.
They found that TNBCs had higher TMEM doorway density score and higher macrophage density scores, which may explain why patients with TNBC often have early recurrence of disease.
They also found that, compared with White patients, Black patients with ER+/HER2– tumors, but not TNBC tumors, had higher TMEM doorway density scores. Similarly, Black patients with ER+/HER– cancers, but not TNBC, had higher macrophage levels than White women, a finding that may explain racial disparity in ER+/HER2– disease, Dr. Oktay said.
For the entire cohort, patients with high TMEM doorway density scores had significantly worse distant recurrence–free survival than patients with intermediate or low scores (P = .008), and there was a trend toward worse DRFS among all patients with ER+/HER2– who were in the highest third of scores, but this did not quite reach statistical significance.
High versus low TMEM doorway density score was also an independent prognostic factor for worse outcomes among the entire cohort (P = .01).
There was no significant difference in TMEM density scores among patients with TNBC.
Neither high macrophage counts nor microvascular density alone were significantly associated with inferior DRFS. TMEM doorway score was the only factor significantly prognostic for worse outcomes among patients in the entire cohort.
Hypothesis needs further testing
Invited discussant Lori Pierce, MD, a radiation oncologist with Michigan Medicine, University of Michigan, Ann Arbor, said it’s unclear whether TMEM doorway density changed following neoadjuvant chemotherapy as there were no prechemotherapy scores available in this study.
“But I think the key part is that, if we think neoadjuvant chemotherapy promotes metastasis, then there should be an inferior outcome compared to adjuvant chemotherapy, but that’s not what we see. Well-powered randomized trials show equivalent outcomes with neoadjuvant chemotherapy as well as adjuvant,” she said.
She noted that a 2018 meta-analysis of individual patient data from 10 randomized trials comparing neoadjuvant with adjuvant chemotherapy in early breast cancer showed no differences in long-term distant recurrences, breast cancer–specific mortality, or all-cause mortality between the two modalities.
“While I think these data are very provocative, I certainly wouldn’t want Black women or any women who need neoadjuvant therapy to be discouraged because of these data. We need these data to be tested rigorously, so I look forward to the clinical trials that will test this question and can really give us more information about this very interesting hypothesis,” Dr. Pierce said.
The study was funded by the National Institutes of Health, New York State Department of Health Peter T. Rowley Breast Cancer Scientific Research Projects, Helen & Irving Spatz Family Foundation, Evelyn Gruss Lipper Charitable Foundation, and the Gruss-Lipper Biophotonics Center and the integrated imaging program at the Albert Einstein College of Medicine. Dr. Oktay reported no conflicts of interests.
AT SABCS 2022