Ruozhu Yang
Yi Han
Wenjun Yi
Qian Long- Department of General Surgery, The Second Xiangya Hospital of Central South University, Changsha, China
Breast cancer is the most common cancer in women worldwide and is a substantial public health problem. Screening for breast cancer mainly relies on mammography, which leads to false positives and missed diagnoses and is especially non-sensitive for patients with small tumors and dense breasts. The prognosis of breast cancer is mainly classified by tumor, node, and metastasis (TNM) staging, but this method does not consider the molecular characteristics of the tumor. As the product of the immune response to tumor-associated antigens, autoantibodies can be detected in peripheral blood and can be used as noninvasive, presymptomatic, and low-cost biomarkers. Therefore, autoantibodies can provide a possible supplementary method for breast cancer screening and prognosis classification. This article introduces the methods used to detect peripheral blood autoantibodies and the research progress in the screening and prognosis of breast cancer made in recent years to provide a potential direction for the examination and treatment of breast cancer.
Introduction
Breast cancer is the most common cancer in women. There were approximately 2.3 million new cases and 685,000 deaths due to breast cancer worldwide in 2020 (1). In the United States, 290,560 new cases and 43,780 deaths have been estimated to occur in 2022 (2). Early diagnosis is vital to improve the survival rate of breast cancer. The five-year relative survival rate for breast cancer in the United States increased from 79% between 1984 and 1986 to 91% between 2008 and 2014, largely due to improvements in early diagnosis and treatment (3).
The most common method used to screen for breast cancer is mammography. Current guidelines all recommend annual or biennial mammography starting at age 40 (4–6). Several studies have shown significant decreases in mortality from breast cancer among women who undergo mammography, with an average reduction of 40 to 46% (7–9). Mammography, however, has many drawbacks. Data from Vermont in the US and Norway yielded sensitivities of 88.2% and 90.7%, respectively (10). According to a study from the Netherlands, the sensitivity of mammography was 85% in individuals with 20 mm-sized breast tumors and was even lower in individuals with smaller breast tumors (11). Inadequate sensitivity can lead to a considerable number of missed diagnoses. Mammography can also lead to false positives or overdiagnosis, causing unnecessary treatment and psychological distress (12, 13). In the United States, 23.8% of women who receive regular mammography had at least one false positive over a 10-year period (14). A Canadian study found that annual mammography did not reduce the mortality rate due to breast cancer in women ages 40 to 59, and 0.24% of those who participated were overdiagnosed with invasive breast cancer (15). In addition, a high density of breast tissue is an independent risk factor for breast cancer, and mammography is less sensitive in high-density breast tissue (16–18). Younger women tend to have denser breasts, which also makes mammography less sensitive (19). These patients can undergo additional ultrasound or magnetic resonance imaging (MRI) to improve sensitivity, but the false positive rate also increases (20).
Tumor, node, and metastasis (TNM) staging is the most used method to determine the prognosis of breast cancer. This system includes an assessment of the characteristics of the primary tumor, regional lymph nodes, and distant metastasis (21). However, this method does not reflect the molecular characteristics of the tumor and does not enable a more accurate prognostic analysis based on the molecular heterogeneity of cancer cells (21). Breast cancer pathological types, molecular subtypes, and gene expression features, including risk alleles, methylation, and single nucleotide polymorphisms, also contribute to different outcomes (22–25). According to assessments of different molecular characteristics and prognoses, including assessments of recurrence risk and survival rate, individualized treatment methods that are more accurate can be adopted (26).
In cancer patients, tumor-associated antigens (TAAs) produced by tumor cells activate B cells that can produce autoantibodies to TAAs. Through the amplification effect of humoral immunity, autoantibodies in the peripheral blood of patients are far more abundant than TAAs, and autoantibodies also have longer half-life. Therefore, by detecting autoantibodies in peripheral blood, breast cancer patients can be screened in the early stage and their prognosis can be predicted. At present, this method is not as effective as mammography, but as a complementary examination, it can help improve the sensitivity and specificity of breast cancer screening and establish more accurate prognostic analysis method. Therefore, the detection of autoantibodies has a promising prospect in the future. This review includes a discussion of the advances in autoantibodies detected in peripheral blood in the diagnosis and prognosis of breast cancer.
Autoantibodies in breast cancer
The tumor microenvironment plays a decisive role in the occurrence, development, and treatment of tumors (27). Due to somatic mutations and genomic instability, the proteome of tumor cells is modified by phosphorylation, acetylation, and glycosylation, resulting in tumor-associated antigens (TAAs). The body produces autoantibodies when TAAs are recognized by the immune system (28). The BCR on B cells specifically binds to the TAAs to initiate an antigen stimulation signal, which is co-transmitted by BCR- Igα/Igβ and CD19/CD21/CD81. As antigen-presenting cells, B cells internalize and process BCR binding antigens through endocytosis. The antigenic peptide produced by antigen degradation binds to MHC class II molecules and is presented to specific Th cells. Activated Th cells express CD40L, which provides a second signal for B cell activation. Activated B cells then produce specific autoantibodies which are released into the peripheral blood. These autoantibodies can be used as new tumor detection indicators to predict the occurrence and prognosis of tumors (Figure 1). Detecting autoantibodies has many advantages. First, autoantibodies have higher stability than other serum proteins and are not easy to hydrolyze, with a half-life of 7-30 days. Second, autoantibodies can be detected when the tumor has developed but clinical symptoms have not yet appeared (28–30). Third, the detection of autoantibodies in peripheral blood is not affected by the density of breast tissue (31, 32); therefore, mammography defects can be prevented using this approach. Finally, peripheral blood autoantibodies can better reflect the molecular characteristics and heterogeneity of breast cancer. The analysis of most autoantibodies individually lacks sufficient sensitivity (33–35), so much research has focused on the analysis of autoantibody combinations. At present, autoantibodies can be used to predict the early occurrence and prognosis of breast cancer; however, this analysis is still in the early stage of development, and there have been no clinical trial reports. Most of the studies are in phase 1 (preclinical exploratory phase) or phase 2 (clinical testing and validation phase of biomarker development) (36–39).
Figure 1 Production and detection of peripheral blood autoantibodies. Tumor associated antigens (TAAs) produced by tumor cells stimulate B cells to differentiate into memory B cells and plasma B cells that can produce autoantibodies. These autoantibodies enter the peripheral blood. The abundance of autoantibodies in peripheral blood is much greater than that of TAAs through the amplification of the immune response process. Therefore, autoantibodies can be detected from plasma or serum to assist in breast cancer screening. Created with BioRender.com.
Autoantibodies as biomarkers for breast cancer
Tables 1, 2 summarize the discovery and application of peripheral blood autoantibodies and autoantibody panels in the diagnosis and prognosis of breast cancer in recent years. Autoantibodies such as p53, MUC1, and HER2/NEU were discovered many years ago and have been studied in detail.
Table 1 Autoantibodies in the Diagnosis of Breast Cancer.
Table 2 Autoantibodies in the Prognosis of Breast Cancer.
p53 autoantibody
In 1979, Albert B. DeLeo et al. used Meth A antiserum to react with 35S methionine-labeled Meth A sarcoma and normal BALB/c lung fibroblasts. They found that Meth A sarcoma contained a protein with an apparent molecular weight (Mr) of approximately 53,000, while normal fibroblasts did not (67). This finding indicates that the Meth A antiserum contains specific antibodies against this protein. The protein is named p53. p53 can be detected in a variety of tumor cells, including breast cancer cells, in animals and humans, but not in normal cells (67–69). Therefore, p53 was initially thought to be an oncogene. However, S.J. Baker et al. subsequently found p53 mutations in the 17p region of colorectal cancer chromosomes that are not present in normal tissues (70). L.A. Donehower et al. found that p53 knockout mice developed normally but were prone to spontaneous tumors (71). Since then, p53 has been mainly studied as a tumor suppressor gene. p53 plays a role in cell cycle arrest, apoptosis, DNA repair, senescence, angiogenesis, cell metabolism, reactive oxygen species (ROS) generation, autophagy, and iron-mediated death. Its mutations can lead to the occurrence of a variety of cancers (72). In 1982, L.V. Crawford et al. detected p53 antibodies in the serum of breast cancer patients but not in healthy controls (73). In subsequent studies of p53 autoantibody detection in the peripheral blood of breast cancer patients that ended in 2016, the median sensitivity and specificity were 17.5% (4.8-100%) and 98.7% (95-100%), respectively. Meta-analysis showed that when the cutoff value was defined as the mean +2 or 3 standard deviations, the summary area under the curve (SAUC) was 0.78 (74). The analysis of p53 autoantibody levels is helpful for breast cancer screening, but because of the relatively low sensitivity, its efficacy is not ideal. However, in recent years there have been several studies using panels including p53 autoantibody, which have yielded high specificities as well as high sensitivities (53, 75). P53 and its autoantibody are widely detected to exist in tissues or serum of different kinds of cancer, and there are no studies on the specificity of p53 autoantibody in breast cancer patients so far. But combining p53 autoantibody with other autoantibodies or proteins is still helpful since p53 plays an important role in the tumorigenesis of breast cancer. Therefore, further research about p53 autoantibody is needed to develop more effective ways to screen for breast cancer. In addition, some studies have shown that the expression of serum p53 autoantibodies is associated with p53 accumulation in tissue (76). However, others speculated that there was no significant correlation between serum p53 autoantibody levels and p53 accumulation in cancer tissues, while the correlation between serum p53 protein levels and the accumulation of p53 in cancer tissues is better (77, 78). In terms of prognosis, recent studies all speculate that p53 autoantibody concentration is considerably associated with poor prognosis (79–81). Some studies have shown that p53 autoantibody concentration is significantly correlated with histological grading and other prognostic information (76, 81). However, some studies have found that p53 autoantibody concentration is not associated with the breast cancer stage (79). Moreover, the analysis of p53 autoantibodies is likely to provide little information about treatment response and tumor recurrence (82).
MUC1 autoantibody
MUC1 is a single channel type I transmembrane protein with a highly glycosylated extracellular domain, which extends 200-500 nm from the cell surface (83–85) and is located on the surface of epithelial cells in the breast, gastrointestinal tract, respiratory tract, urinary tract and reproductive tract (86). In healthy tissues, MUC1 protects epithelial cells and acts as a barrier against pathogen colonization (87, 88). Loss of miR-125b expression in breast cancer cells leads to overexpression of MUC1 (89). MUC1 is overexpressed in 91% of breast cancers and is often found in pancreatic cancer, colon cancer, and lung cancer (86, 90). Unlike the normally expressed MUC1, ta-muc1 mainly exhibits a core 1° glycan (91) and is highly sialylated (92). Abnormal glycosylation changes induce an immune response and lead to the production of MUC1 antibodies. Using a glycopeptide microarray containing a 60-mer MUC1 glycopeptide, Blixt et al. reported that the level of MUC1 autoantibodies in patients with early breast cancer (n=365) was significantly higher than that in women with benign breast disease (n=108) or healthy controls (n=99). Interestingly, the induction of autoantibodies to the core 3 and STN glycoforms of MUC1 is significantly associated with a reduction in the incidence of metastasis and an increase in the amount of time before metastasis occurs, which may suggest that different glycoforms of MUC1 may be involved in the progression of cancer (37). A study on a BRCA1/2 mutant female population (n=127) reported that the level of MUC1 autoantibody in mutation carriers was lower than that in the healthy control group. Moreover, contrary to previous studies on women with sporadic breast cancer, no increase in MUC1 IgG antibody levels was found in women at high genetic risk of breast cancer (93). However, Burford et al. applied the 60-mer MUC1 glycopeptide and a microarray platform of recombinant MUC1 containing 16 tandem repeats to screen serum samples and verify the expression of MUC1 autoantibodies and concluded that autoantibodies against the MUC1 glycopeptide cannot be used to distinguish cases and controls (94).
HER2/neu autoantibody
In 1984, A. L. Schechter et al. found that neuro/glioblastoma transformed with DNA from four rat neuro/glioblastoma cell lines all contained the same transforming gene, the NEU gene (95). The gene can be used to synthesize a kind of tumor antigen with a Mr of 185,000 (p185). The sequence of Neu is homologous to that of erb-B, which is the epidermal growth factor receptor (EGFR) gene, but the two are different genes (95, 96). In humans, the counterpart to neu was named HER2 (97). A subsequent study concluded that P185, a product of HER2, was found in 46% of primary breast cancers (98). In 1997, M. L. Disis et al. detected HER-2/neu antibody expression in 11% of breast cancer patients but not in normal controls using ELISA, and the presence of the HER-2/neu antibody was associated with the overexpression of HER-2/neu protein in tumors (99). Recent studies using HER2 autoantibodies to screen for breast cancer have yielded a median sensitivity and specificity of 17.4% and 94%, respectively (74). The analysis of HER2 expression alone is clearly not sufficient to screen for breast cancer. In terms of prognosis, studies have shown that high concentrations of anti-HER2 autoantibodies are associated with a good prognosis in patients with invasive breast cancer, possibly due to enhanced humoral immunity against breast cancer (100). Yukiko Tabuchi et al. also showed that the expression of HER2 autoantibodies was significantly associated with relapse-free survival of breast cancer (65).
Other important autoantibodies
Heat-shock protein (HSP) plays an important role in breast cancer (101). In 1991, A. Thor et al. evaluated the amount of HSP-27 expression in human breast cancer and breast cancer cell lines and showed a relationship between HSP-27 overexpression and breast cancer invasiveness (102). However, subsequent studies have shown that HSP-27 and its autoantibodies are not suitable to be used as biomarkers for breast cancer screening due to low sensitivity (103). In 1993, A. Jameel et al. isolated and characterized a clone homologous to HSP-90 and found that its high expression was associated with early recurrence and reduced overall survival of breast cancer patients (104). S. E. Conroy et al. showed that HSP-90 autoantibodies are associated with metastasis of breast cancer (105). HSP-60 autoantibodies also contribute to the early diagnosis of breast cancer, especially ductal carcinoma in situ (DCIS) (106).
NY-ESO-1 autoantibodies have also been used in several studies for screening for breast cancer (38, 62). However, its sensitivity is very low, since only about 7% of breast cancer patients have positive serum NY-ESO-1 autoantibodies (34, 107). Autoantibodies of c-myc, BRCA1, BRCA2, cyclin B1, and survivin also have been used in several panels for screening for breast cancer (38, 45).
Autoantibody panels
Most autoantibodies are not capable of screening for breast cancer alone, but combining multiple autoantibodies or autoantibodies with other tumor biomarkers into a panel can improve the sensitivity and specificity. In recent years, Xuejun Dong et al. combined the classic biomarker CA 15-3 with FTH1 and hnRNPF autoantibodies into a panel and yielded a sensitivity of 89.3% and a specificity of 93.8% (108). A combination of multiple HSP and p53 autoantibodies yielded a sensitivity of 86% and a specificity of 100% (53). Although it is hard to do accurate mathematical statistics, we can see from Table 1 that generally speaking, studies using panels have yielded a higher area under the ROC curve (AUC) and higher sensitivity, while the specificity does not seem to have been improved by panels (Table 1 and Figure 2). However, the combination of more kinds of autoantibodies or proteins does not necessarily guarantee a higher specificity or sensitivity. A study detecting TOPO48 autoantibody alone has yielded a sensitivity of 100% and specificity of 76%, and the area under the AUC was 0.801, which is higher than that of many panels (59). To make good use of the advantages of panels, it is essential to select proper autoantibodies and proteins that make up the panels. However, there is no method recognized as the most effective for selecting the autoantibodies that comprise the panels.
Figure 2 The composition, advantage, and problem of autoantibody panels. Multiple autoantibodies and/or other proteins constitutes a panel. Detection of these substances in peripheral blood can help in breast cancer screening. The advantage of panels is that they possibly help to obtain higher AUC and sensitivity than detecting for single autoantibodies, but the specificity may not be improved. The difficulty is that there is no recognized best method for selecting autoantibodies or other proteins that make up a panel. Created with BioRender.com.
Methods used to detect autoantibodies
Serological identification of antigens by recombinant expression cloning
Michael Pfreundschuh et al. first used this technique in 1995 to extract mRNA and construct cDNA libraries from several kinds of cancer tissues (109). Diluted patient serum was reacted with recombinant proteins expressed in E. coli transfected with phage. Subsequently, serum antibodies binding to recombinant proteins were screened. Finally, staining was performed to show the results (109). This method does not require in vitro culture of cancer cell lines and CTL cells, thus avoiding MHC restriction, and can be used to detect autoantibodies against cancer cells from the serum of cancer patients (110). Moreover, SEREX can be used to detect a wide range of autoantibodies. SEREX has been used to detect peripheral blood autoantibodies in lung cancer, renal cell carcinoma, colon cancer, acute myeloid leukemia, hepatocellular carcinoma, gastric cancer, etc. (111–116). In breast cancer, ING1, LDH, fibulin-1, Topoisomerase-II-beta (TOPII), and Topoisomerase I binding protein (Topors) have been detected by SEREX (117–119). The disadvantage of SEREX is that the process is laborious and difficult to automate. Therefore, it can only be used for the discovery of new autoantibodies but not for the diagnosis of large numbers of patients and the screening of healthy people. Moreover, protein expression in phages does not involve posttranslational modification as it does in humans. Therefore, SEREX cannot be used to detect antibodies against autoantigens produced by posttranslational modifications. The characteristics and advantages of SEREX and the several methods introduced next are shown in (Table 3 and Figure 3).
Table 3 Advantages and disadvantages of methods for detecting autoantibodies.
Figure 3 Methods for identifying tumor-associated antigens and correlated autoantibodies. Created with BioRender.com.
Phage display
Phage display uses cDNA derived from tumor tissue to construct cDNA phage display libraries. The phages are then reacted with diluted patient serum. The eluted phages are then amplified and screened again with the patient’s serum. This process is repeated several times (120, 121). This multiple screening processes have a strong enrichment capacity and thus leads to better sensitivity and selectivity than SEREX. Phage display also requires a smaller amount of patient serum and enables the screening of numerous different phages in the same batch, making detection more efficient (120, 121). Thus, phage display has many advantages over the use of a single screening method, such as SEREX. However, similar to SEREX, phage display cannot be used to detect antigens derived from posttranslational modifications. In addition, some proteins cannot be expressed on the surface of phages. Phage display has been used to detect autoantibodies in the breast, prostate, colon, stomach, hepatocellular carcinoma, etc. (119, 121–125). Xuejun Dong et al. combined CA 15-3 with heterogeneous nuclear ribonucleoproteins F (hnRNPF) and ferritin heavy chain (FTH1) detected through Phage display into a panel for breast cancer screening and achieved 89.3% sensitivity and 93.8% specificity (108). The proteins detected in the phage display can also be used to generate phage protein microarrays to establish autoantibody panels that can be used for screening (122, 124).
Serological proteome analysis
Christoph S. Kladel et al. used SERPA in 2001 to identify serum autoantibodies in renal cell carcinoma (126). The SERPA process begins with the separation of mixed proteins in cancer tissue by two-dimensional gel electrophoresis and silver staining (126, 127). Then, immunoblotting was performed with the isolated protein and diluted serum from patients and healthy controls. Spots of binding are then revealed. Finally, the proteins are identified by mass spectrometry (MS) (126). SERPA has the advantage of being able to separate mixed proteins into single components by two-dimensional gel electrophoresis. This approach can be used to directly study tumor proteins extracted from tumor tissue and therefore can be used to detect a wide range of posttranscriptional modifications, protein isotypes, and so on. Additionally, unlike SEREX, SERPA does not require the construction of a cDNA library. SERPA has been used to detect serum autoantibodies in patients with gastric cancer, melanoma, gallbladder cancer, prostate cancer, thyroid cancer, lung cancer, etc. (128–133). Glucose-6-phosphate dehydrogenase (G6PD) was detected in breast cancer samples through SERPA (134). The detection range of SERPA is limited by its inability to be used to dissolve large, non-hydrophilic proteins, and it is difficult to detect low-abundance antigens with this method. As with SEREX, it is also difficult to assess a large number of samples with SERPA.
Multiple affinity protein profiling
Julie Hardouin et al. detected serum autoantibodies in colon cancer using MAPPing (135). MAPPing involves two-dimensional immunoaffinity chromatography, trypsin treatment, and MS/MS analysis. In 2-D immunoaffinity chromatography, proteins that do not bind to antibodies in serum obtained from healthy controls are isolated, and then the antigens that could bind to IgG isolated from the patient’s serum are eluted and collected. Therefore, the possible tumor-associated antigens can be isolated (135). Two-dimensional immunoaffinity can be used to exclude a variety of high-abundance proteins that can react with antibodies in healthy control sera and enrich for low-abundance proteins, thus facilitating the detection of low-abundance tumor-associated antigens from confounding proteins (136).
Protein microarray
The protein microarray can be used to present and assess hundreds of tumor antigens with low sample consumption. Anderson et al. applied a new protein chip technology, nucleic acid protein programmable array (NAPPA), with a three-phase sequential screening strategy. This approach involves printing the cDNA encoding the target gene on the substrate rather than the purified protein (137, 138). Within a few hours, the genes are transcribed and translated to produce the protein. This method minimizes protein degradation and preserves protein structure to the greatest extent possible, and the protein is prepared before the patient’s serum is tested. Finally, the specificity and sensitivity of 28 potential autoantibody biomarkers in the early detection of breast cancer were verified (139). Blixt et al. explored autoantibodies against abnormally glycosylated MUC1 and found that high levels of core3muc1 (glcnacb1-3galnac-muc1) and stnmuc1 (neuaca2,6galnac-muc1) glycotype autoantibody subsets were significantly related to a reduction in the incidence rate and an increase in metastasis time. The autoantibody response of patients with early breast cancer is highly correlated with age (37).
Biosensors
Biosensors are sensitive to biological substances and convert them into electrical signals for detection. Because nanomaterials make biosensors more sensitive and more suitable for high-throughput analysis, there have been more studies on nanosensors in recent years. Masud et al. developed a gold-loaded nanoporous iron oxide nanocube (AU NPFE 2° 3 NC), which achieved good clinical adaptability in the detection of p53-specific autoantibodies (140). Feyzi Barnaji et al. generated an electrochemical biosensor with nanocomposites containing th/cs/ni(OH) 2 nps/ergo on the surface of a glassy carbon electrode and detected anti-p53 autoantibodies. The experimental results showed stability, reproducibility, and high sensitivity (141).
Glycan array
A glycan array is a high-throughput device that can be used to detect autoantibodies against abnormal glycans (142, 143). Decades of research suggested that abnormal glycosylation was a sign of cancer (144). Abnormal glycan structure can cause an immune response earlier than disease symptoms arise and lead to the production of anti-glycan antibodies (145). Some groups have manufactured high-throughput devices to fix the sugar chain structure onto a glass surface to screen for anti-sugar chain antibodies in patient samples (37, 145, 146). Blixt et al. used a sugar chain array to identify anti-sugar chain antibodies against mucin 1 (MUC1) glycopeptide and found higher levels of MUC1 and cancer-related glycotypes in patients with early breast cancer (37).
Validation methods
Single plex ELISAs are the most commonly used method to verify the presence of peripheral blood autoantibodies. Engvall, E. et al. were the first to use ELISA to measure IgG levels in rabbit serum (147). In 1985, Kostiala, A. A. et al. used ELISA to detect serum single-strand DNA (ssDNA) antibodies in patients with hematological malignancies who were followed up (148). In breast cancer, ELISA was first used to study serum p53 autoantibodies (76, 149). In addition to ELISA, Western blotting (WB) is also a commonly used assay.
Conclusion and future directions
The analyses of existing autoantibodies lack sufficient specificity and sensitivity, most of which are not higher than mammography, and there is no standard for detecting autoantibodies for early cancer diagnosis. In addition, most studies have been about the relationship between autoantibodies and early cancer diagnosis. Only a few researchers have studied the relationship between autoantibodies and prognosis, and different studies of the same antibody sometimes have opposite results. Additionally, it is recommended that future autoantibody studies strictly follow the five-phase model and prospective sample collection retrospective evaluation (PRoBE) guidelines, which would enable autoantibody screening to be applied to clinical practice earlier (150, 151).
Although the analysis of peripheral blood autoantibodies is not sufficient when used alone to screen for breast cancer, this analysis can be used as a complement to mammography. The development and application of panels can improve the accuracy of screening for breast cancer with peripheral blood autoantibodies, and its effect is better than the effect of detecting a single autoantibody. Currently, most panels are limited to the combination of multiple autoantibodies. In the future, the combined analysis of autoantibodies and serum protein biomarkers or other components in peripheral blood can be studied, thus providing more possibilities for breast cancer screening (52). Some concerns remain about the analysis of peripheral blood autoantibodies. For example, the levels of some serum autoantibodies probably do not correlate well with the accumulation of corresponding antigens in cancer tissues, including p53 (77, 78). In addition, although many methods can detect peripheral blood autoantibodies, each method has limitations. More accurate and efficient detection methods are needed in the future. There are also studies examining the analysis of autoantibodies isolated from other body fluids, including saliva (152). Sample sources other than blood may be considered in the future.
In addition to being used for screening, peripheral blood autoantibodies can also contribute to the treatment and prognosis of breast cancer. Some autoantibodies have been linked to factors of prognosis, including survival rate, recurrence rate, and response to treatment. Testing for autoantibodies can help more accurately classify breast cancer, predict a patient’s risk, and determine how a patient is likely to respond to different treatment options so that the most effective option is selected. For example, the detection of serum anti-ER α autoantibodies is likely to help predict tamoxifen resistance in patients with ER-positive breast cancer, thus enabling appropriate treatment decisions (153). Recently, Rongrong Luo et al. identified five autoantibodies whose concentration differed in the serum of patients with different subtypes of breast cancer. The panel composed of the five autoantibodies can be used to discern triple-negative breast cancer from non-triple-negative breast cancer, and the AUC is 0.875 (63). At present, the specific mechanism of various autoantibodies and their corresponding antigens in the occurrence and development of breast cancer remains to be studied. Future research can focus on related proteins and their signaling pathways, thus providing new possibilities for the treatment of breast cancer.
Author contributions
WY and QL designed the study. RY and YH drafted the manuscript. QL revised the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This study was funded by the Science and Technology Innovation Program of Hunan Province (Grant No. 2021SK2026), Health and Family Planning Commission of Hunan Province (Grant No. 20221J70143), and the National Natural Science Foundation of China (Grant No. 82270834 and 81873640).
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: breast cancer, autoantibody, early diagnosis, prognosis, autoantibody detection
Citation: Yang R, Han Y, Yi W and Long Q (2022) Autoantibodies as biomarkers for breast cancer diagnosis and prognosis. Front. Immunol. 13:1035402. doi: 10.3389/fimmu.2022.1035402
Received: 02 September 2022; Accepted: 28 October 2022;
Published: 14 November 2022.
Edited by:
Shaoquan Zheng, The First Affiliated Hospital of Sun Yat-sen University, ChinaReviewed by:
Zhi-Wei Wang, Wenzhou Medical University, ChinaYin Xiaomao, Shanghai Jiao Tong University, China
Xu Feng, Fudan University, China
Copyright © 2022 Yang, Han, Yi and Long. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Qian Long, dr_longqian@csu.edu.cn
†These authors have contributed equally to this work