Abstract | BACKGROUND: METHODS: Among 718 women with primary invasive breast cancer within the large population-based prospective Malmö Diet and Cancer Study, tumor-specific CAP1 levels were assessed following thorough antibody validation and immunohistochemical staining of tumor tissue microarrays. Antibody specificity and functional application validity were determined by CAP1 gene silencing, qRT-PCR, Western immunoblotting, and cell microarray immunostaining. Kaplan-Meier and multivariable Cox proportional hazard models were used to assess survival differences in terms of breast cancer-specific survival (BCSS) and overall survival (OS) according to body composition and CAP1 expression. RESULTS: Study participants were followed for up to 25 years (median 10.9 years), during which 239 deaths were observed. Patients with low CAP1 tumor expression were older at diagnosis, displayed anthropometric measurements indicating a higher adiposity status (wider waist and hip, higher body mass index and body fat percentage), and were more prone to have unfavorable tumor characteristics (higher histological grade, higher Ki67, and estrogen receptor (ER) negativity). Overall, patients with CAP1-low tumors had impaired BCSS (adjusted hazard ratio: HRadj = 0.52, 95% CI 0.31-0.88) and OS (HRadj = 0.64, 95% CI 0.44-0.92) compared with patients having high CAP1 tumor expression. Further, analyses stratified according to different anthropometric measures or ER status showed that the CAP1-associated survival outcomes were most pronounced among patients with low adiposity status or ER-positive disease. CONCLUSIONS: Low CAP1 tumor expression was associated with higher body fatness and worse survival outcomes in breast cancer patients with effect modification by adiposity and ER status. CAP1 could be a novel marker for poorer survival outcome in leaner or ER-positive breast cancer patients, highlighting the need for considering body constitution in clinical decision making.
|
Authors | Malin Bergqvist, Karin Elebro, Malte Sandsveden, Signe Borgquist, Ann H Rosendahl |
Journal | Breast cancer research : BCR
(Breast Cancer Res)
Vol. 22
Issue 1
Pg. 67
(06 19 2020)
ISSN: 1465-542X [Electronic] England |
PMID | 32560703
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Biomarkers, Tumor
- CAP1 protein, human
- Cell Cycle Proteins
- Cytoskeletal Proteins
- Receptors, Estrogen
- Receptors, Progesterone
- ERBB2 protein, human
- Receptor, ErbB-2
|
Topics |
- Antineoplastic Combined Chemotherapy Protocols
(therapeutic use)
- Biomarkers, Tumor
(metabolism)
- Body Constitution
- Breast Neoplasms
(drug therapy, metabolism, pathology)
- Cell Cycle Proteins
(genetics, metabolism)
- Cytoskeletal Proteins
(genetics, metabolism)
- Female
- Follow-Up Studies
- Humans
- Middle Aged
- Neoadjuvant Therapy
- Obesity
(metabolism, physiopathology)
- Prognosis
- Prospective Studies
- Receptor, ErbB-2
(metabolism)
- Receptors, Estrogen
(metabolism)
- Receptors, Progesterone
(metabolism)
- Survival Rate
|