Open Access

Biological implications of decoding the extracellular matrix of vulva cancer

  • Authors:
    • Mohammad Emranul Islam
    • Kala Chand Debnath
    • Rohan Moniruzzaman
    • Kohei Okuyama
    • Shajedul Islam
    • Harsh Nitin Dongre
  • View Affiliations

  • Published online on: December 6, 2024     https://doi.org/10.3892/or.2024.8852
  • Article Number: 19
  • Copyright: © Islam et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The present review aimed to elucidate the roles of extracellular matrix (ECM) components in the progression of vulvar squamous cell carcinoma (VSCC) and explore potential therapeutic avenues for this type of malignancy. This exploration holds promise for identifying precise molecular targets within the ECM milieu, thus facilitating the development of innovative therapeutic modalities tailored to disrupt these interactions and ultimately improve patient outcomes in VSCC. The dysregulated ECM serves as a potent driver of SCC tumor progression, orchestrating key processes such as angiogenesis, inflammation and stromal cell behavior. Yet, the exploration of ECM role in VSCC is still in its early stages. Recent research highlights the critical role of ECM organization and expression within the tumor microenvironment (TME) in influencing key aspects of VSCC, including tumor staging, grading, metastasis, invasion and patient survival. Cancer‑associated fibroblasts play a pivotal role in this dynamic by engaging in reciprocal interactions with VSCC cells, leading to significant ECM alterations and creating an immune‑suppressive TME. This hinders antitumor immunity and fosters therapeutic resistance in VSCC treatment. The dysregulated ECM in VSCC drives tumor progression, metastasis and affects patient survival. Targeting ECM, along with emerging therapies such as immune checkpoint blockade, offers promise for improved VSCC treatment outcomes.

Introduction

Vulvar cancer is the fourth most prevalent gynecological cancer globally, representing 5% of lower genital tract tumors and ranking below uterine corpus, ovarian and cervical cancer (13). Key contributors to vulvar cancer development include age, human papillomavirus (HPV) infection, smoking, inflammatory vulvar conditions, prior pelvic radiation, immunodeficiency and anogenital warts (46). Among the different histological types of vulvar cancer, vulvar squamous cell carcinoma (VSCC) is the most common type (95%), followed by melanoma, sarcoma and basal cell carcinoma (2,3). VSCC has traditionally been regarded as a disease of postmenopausal women, although the mean age of incidence has fallen in recent years worldwide owing to the increase in HPV infections (1). Nonetheless, the age-specific incidence ranges from 0.4 per 100,000 in younger women to 20 per 100,000 in women >70 years old (7).

VSCC manifests in two types with different pathways: The basaloid and/or warty type often associated with HPV (HPV subtypes 16, 18, 31 and 33) which is predisposed from usual vulvar intraepithelial neoplasia (uVIN), and the second type linked to chronic vulvar dermatoses and differentiated vulvar intraepithelial neoplasia (dVIN) (8). Common TP53 mutations are observed in the second type and are mostly independent of HPV (8). Although there are survival differences in these two types of VSCC, treatment is predominantly surgery with or without radio-chemotherapy. Immunotherapy has reformed the therapeutic paradigms of multiple malignancies, but its impact is limited in VSCC (1). In addition, treatment of unresectable/metastatic disease often leads to frequent comorbidities, particularly in elderly and frail women, highlighting the need for innovative and more effective treatment approaches.

Carcinomas comprise both malignant and non-malignant cells, including fibroblasts, immune cells, vascular cells and neuronal cells (9). Non-malignant cells actively shape the tumor microenvironment (TME) by secreting cytokines, chemokines, growth factors and extracellular matrix (ECM) proteins (9). Under normal physiological conditions, resident cells maintain tissue balance through ECM deposition, degradation and remodeling (10). However, carcinogenesis disrupts ECM remodeling, creating a dysfunctional ECM conducive to a supportive TME that promotes cancer growth, invasion and metastasis (11). While specific research on ECM proteins in VSCC is limited, studies are starting to explore the role of ECM remodeling in VSCC invasion and metastasis.

The present review aims to provide an overview on the role of ECM during VSCC metastasis and the current understanding of the role of ECM in regulating VSCC dissemination. The present study also explored the therapeutic potential of targeting ECM in other types of squamous-epithelial cancers, and the potential prognostic and predictive biomarkers, discussing their impact on developing more efficacious antitumor therapies.

Overview of ECM components

The ECM is commonly defined as the non-malignant, non-cellular component of tissue that provides essential biochemical and structural support to its cellular constituents (12,13). Emerging research suggests that the ECM is not merely an intercellular filler but a physiologically active component of living tissue, playing crucial roles in cell-cell communication, adhesion and proliferation (14,15). Resident fibroblasts are responsible for creating and arranging ECM components according to the specific needs of the tissue (14,16). Major components of the ECM, including collagen, laminin, elastin and proteoglycans, exhibit distinct physical and biochemical properties. A detailed overview of ECM components is shown in Table I.

Table I.

An overview of extracellular matrix components.

Table I.

An overview of extracellular matrix components.

CategoryMajor formsComponents
Types of collagensFibril-formingI, II, III, V, XI, XXIV, XXVII
Fibril-associatedIX, XII, XIV, XVI, XIX, XX, XXI, XXII
Network-formingIV, VIII, X
Membrane-anchoredXIII, XVII, XXIII, XXV
MultiplexinXV, XVIII
Types of microfibrillar proteins Elastin, Fibrillin, Fibulin, Microfibril-associated glycoproteins, Elastin microfibril interfacer 1
Types of matricellular glycoproteins Fibulin, Thrombospondin, Osteopontin, Tenascin, Periostin, Cartilage Oligometric Matrix Protein,
Types of glycoproteins Fibrinogen, Fibronectin, Laminin, Vitronectin, Nidogen
Types of proteoglycansIntracellular secretory granulesSerglycin
TransmembraneSyndecan, Phosphacan, Neuronglia antigen-2, Betaglycan
PericellularPerlecan, Argin, Collagens-XV, XVIII
Extracellular (hyaluronan and nectin-binding proteoglycan)Aggrecan, Neurocan, Brevican, Versican
Extracellular (Small leucine-rich proteoglycan):Biglycan, Lumican, Keratocan, Osteoglycin, Chondroadherin, Podocan
Types of secreted MMPsCollagenaseMMP1, MMP8, MMP13
GelatinaseMMP2, MMP9
StromelysinMMP3, MMP10
MatrilysinMMP7, MMP26
Other MMPsMMP11, MMP28, MMP12, MMP19, MMP20
Types of membrane-anchored MMPsType I transmembrane-type MMPMMP14, MMP15, MMP16, MMP24
Glycosylphosphatidylinositol-linked MMPMMP17, MMP25
Type I transmembrane-type MMPMMP23

[i] MMPs, matrix metalloproteinases.

ECM remodeling in tumorigenesis

Dysregulation of the ECM is a critical factor in cancer development and progression, influencing various key mechanisms. One such mechanism is cellular signaling, where abnormalities in the ECM contribute to uncontrolled cell growth, survival and proliferation, all fundamental cancer hallmarks (14). Moreover, the ECM plays a critical role in cell adhesion and migration, facilitated by proteins such as integrins and cadherins. Disruption of these processes promotes the invasion of cancer cells into surrounding tissues (Fig. 1A) (10). The ECM also affects the immune response within TME, contributing to immune evasion by cancer cells (14). It has been shown that ECM components impede and educate immune cell types such as natural killer cells, macrophages and tumor-infiltrating lymphocytes, specifically CD8+ T cells, within the TME and evade the antitumor immune response (14,17,18). Components such as cross-linked collagen, fibronectin, laminin, periostin, osteopontin, integrins and matrix metalloproteinases (MMPs) can erect physical barriers, hindering immune cell movement and impairing the ability of immune cells such as cytotoxic CD8+ T-cells to target and eliminate cancer cells (Fig. 1B) (19,20).

Figure 1.

(A) Role of ECM components in tumorigenesis: (I) Neoplastic cells in the epithelium proliferate rapidly leading to mechanical strain on the basement membrane. (II) This leads to an increase in number of fibroblasts (now called activated fibroblasts) in the stroma. (III) Activated fibroblasts increase the deposition of collagen leading to a stiff matrix. This in turn activates various mitogenic pathways in cancer cells making them more motile and proliferative. (IV) Neoplastic epithelial cells breach the basement membrane and migrate along the aligned collagen. The neoplastic cells gain access to nearby draining lymph nodes or blood vessels leading to metastasis. (B) ECM components hindering tumor-infiltrating lymphocyte infiltration in TME: ECM constituents such as collagen, fibronectin, laminin, periostin, osteopontin, integrins and MMPs can create physical barriers, impeding immune cell movement and compromising the ability of cytotoxic CD8+ T-cells to target and eliminate cancer cells. (C) ECM components and cancer hallmarks in SCCs: ECM components present across SCCs are implicated in various cancer hallmarks. The size of circles denotes significant P-values. (D) ECM components and cancer hallmarks in VSCC. ECM components specific to VSCC are associated with cancer hallmarks. The size of the circles indicates significant P-values. (Figure was created using Bio-Render; http://www.biorender.com/). ECM, extracellular matrix; TME, tumor microenvironment; MMPs, matrix metalloproteinases; SCC; VSCC, vulvar squamous cell carcinoma.

Understanding the intricate interplay between tumorigenesis and the ECM is essential for developing targeted therapeutic approaches. Fig. 1C illustrates the significant involvement of ECM components in various cancer hallmarks. Over time, intensive research has been dedicated to exploring interventions targeting ECM components or disrupting ECM-associated signaling pathways in tumors originating from squamous epithelia. These endeavors have yielded valuable scientific insights, which are outlined in Table II, and offer promising directions for advancing SCCs treatment (21102).

Table II.

Involvement of ECM proteins in tumors of squamous epithelial origin.

Table II.

Involvement of ECM proteins in tumors of squamous epithelial origin.

TumorsECMsClinical significances(Refs.)
HNSCCMMP1Promotes tumor progression and associates with poor survival outcome(21)
MMP3Regulates cancer stem cells during tumor initiation and metastasis(28)
MMP7Promotes invasion, proliferation, motility and metastasis(31)
MMP9Plays a role in tumorigenesis(46)
MMP10Promotes invasion and metastasis(35)
MMP11Involves lymph node metastasis and survival(39)
MMP12Correlates with extracapsular spread and nodal metastasis(41)
MMP13Promotes invasion-related factors and is involved in tumor angiogenesis(43)
MMP14Promotes the formation of functional invadopodia during cancer progression(46)
ITGA5Promotes the progression of OSCC via activating the PI3K/AKT signaling pathway(50)
ITGB1Contributes to perineural invasion and maintaining radio-resistance(51)
ITGB6Increases carcinoma cell motility and growth; negatively affects fibronectin matrix assembly(52)
ITGA5, ITGB8Promotes cancer cell migration and invasion on type I collagen(53)
ITGB1, ITGA6, ITGB4Reduced expression relating to the loss of basement membrane proteins leading to the invasion of cancer cells(54,58)
COL1A1Induces proliferation and metastasis(61)
COL1A2High recurrence and less disease-free survival(61)
COL3A1Promotes the differentiation of tumor cells, low survival outcome, induces tumor growth, negatively influences immune cell infiltration(63)
COL4A1Promotes cancer cell proliferation and migration(64)
COL11A1Advanced clinical stage (proliferation, migration, invasion) and poor overall survival, immune evasion(65,66)
COLXVIIPromotes growth, invasion(67)
LAMB3Associates with lymph node metastasis, invasion and a poor prognosis(68)
LAMC2High expression associated with high-intensity tumor budding and invasion(69)
CD44High expression related to a worse tumor prognosis(7072)
PeriostinPromotes invasion and anchorage-independent growth in the metastatic process(73)
OsteopontinPromotes chemotherapeutic resistance and is associated with worse overall survival(7)
ESCCMMP1Promotes tumor growth and metastasis(22)
MMP2Promotes invasion and metastasis(25)
MMP3Promotes invasion and metastasis(27)
MMP9Promotes tumor progression and a poor prognosis(25,33,34)
MMP10Associated with poorer disease-specific survival(36)
MMP11Promotes tumor invasion and metastasis(38)
MMP12Correlates with tumor grade and stage, nodal metastasis and poor survival(42)
MMP13Associated with tumor staging, grading and lymph node metastasis(44)
MMP14Promotes cell migration, invasion and proliferation(48)
ITGA6Promotes metastasis via binding to integrin α6(55)
ITGB1Promotes cancer cell proliferation, invasion and chemoresistance(56)
ITGA5Promotes lymph node metastasis, tumor size and poor survival of the patient(57)
COL1A2Induces proliferation and metastasis, promotes EMT(62)
COL6A5Low expression associated with poor survival(75)
COL18A1Associated with poor survival(75)
COL3A1Down-regulation involved with growth suppression in subcutaneous xenograft mouse models and inhibited lung metastasis mouse models(76)
COL11A1Advanced clinical stage and lymph node metastasis(77)
LAMA1High expression associated with cell proliferation and migration(78)
LAMC2Promotes invasion and metastasis(79,80)
LAMC1High expression associated with cell proliferation and migration(81)
CD44Promotes lymph node metastasis, vascular invasion and disease recurrence(82)
PeriostinAssociated with poor postoperative outcomes(83)
OsteopontinPromotes cancer cell proliferation, invasion and chemoresistance(84,85)
LSCCMMP2Associated with metastasis and patient poor prognosis(24)
MMP7Associated with tumor proliferation and a poor prognosis(30)
MMP12Correlates with the pathological stage and lymph node metastasis(40)
MMP14Higher expression predicts a poor prognosis(45,47)
COL1A1Promotes immunosuppressive tumor microenvironment(60)
COL6A5Low expression correlates with worse overall survival(86)
COL3A1Promotes growth and cisplatin resistance, poor survival(87)
COL6A1Promotes immunosuppressive tumor microenvironment(88)
COL11A1Promotes cancer cell proliferation, migration, invasion and drug resistance(89)
LAMC2Negatively correlated with patient survival(90)
LAMA3, LAMA5Promotes cancer cell invasion(91)
LAMB3Leads to apoptosis protection, cell proliferation and increased tumor invasion(92)
CD44Correlates with advanced lymph node metastasis(93)
PeriostinNo significant association of periostin and worse outcomes or survival(94)
OsteopontinPresence in biofluids might be useful for diagnosis(95)
CSCCMMP1Promotes angiogenesis(23)
MMP2Associated with poor survival outcome(26)
MMP3Promotes cancer cell proliferation(29)
MMP7Associated with increased lymph metastasis, pathological grade and clinical stage(32)
MMP9Associated with a favourable cervical cancer prognosis(32)
MMP10Promotes cell migration and invasion, endothelial cell tube formation, and resistance to apoptosis(37)
MMP14Associates with angiogenesis, invasion, metastasis and poor prognosis(49)
COL1A1Induces apoptosis and inhibits cell growth(59)
COL6A1Associated with poor overall and recurrent-free survival(96)
COL11A1Associated with poor overall survival(89)
LAMC3Promotes invasion and metastasis(97)
LAMC2Promotes invasion and microinvasion(98)
CD44Associated with poorer prognosis in stage III cancer patients(99)
PeriostinPromotes lymph node metastasis and lymph angiogenesis(100,101)
OsteopontinAssociated with immune suppression, high glycolytic metabolism, apoptosis, angiogenesis and EMT(102)

[i] HNSCC, head and neck squamous cell carcinoma; ESCC, esophageal squamous cell carcinoma; LSCC, lung squamous cell carcinoma; CSCC, cervical squamous cell carcinoma.

Navigating the matrix: Understanding ECM dynamics in vulvar cancer

The ECM in VSCC is a dynamic and influential factor in tumor development (11). This intricate network of proteins, including collagens, laminin, osteopontin, dystroglycan, integrin, CD44 and MMPs, significantly contributes to the progression of VSCC (11). Fig. 1D provides a concise summary of the roles of specific ECM proteins in VSCC and their effects on the hallmarks of cancer. These hallmarks include invasion and metastasis, resistance to cell death, promotion of inflammation, facilitation of replicative immortality and evasion of immune destruction. Thus, understanding the ECM landscape in VSCC can provide valuable insights into the molecular mechanisms underlying this type of cancer.

In order to decipher key ECM proteins involved in VSCC progression, a thorough literature search was performed in the present study. The following MeSH terms were used in PubMed (https://pubmed.ncbi.nlm.nih.gov/), Scopus (https://www.scopus.com/home.uri) and Web of Science (https://mjl.clarivate.com/home) to select literature describing ECM and VSCC tumor progression and development: (‘genital neoplasms, female’[MeSH Terms] OR ‘female genital neoplasm*’[All Fields] OR ‘Gynaecologic neoplasm*’[All Fields] OR ‘Vulvar Neoplasms’[MeSH Terms] OR ‘vulvar neoplasm*’[All Fields] OR ‘vulva neoplasm*’[All Fields] OR ‘cancer of vagina*’[All Fields] OR ‘cancer of vulva*’[All Fields] OR ‘vulva squamous cell carcinoma*’[All Fields] OR ‘vaginal neoplasm*’[All Fields] OR ‘vagina cancer*’[All Fields]) AND (‘Extracellular Matrix’[MeSH Terms] OR ‘extracellular matrix*’[All Fields] OR ‘extracellular matrix protein*’[All Fields]) AND 1980/01/01:2023/12/31 [date-publication]. In the following section, each of the ECM proteins implicated in VSCC progression are described in detail. Table III (103115) summarizes the key findings regarding ECM proteins in VSCC. This table provides a concise overview of the significant associations, functional implications and clinical relevance of ECM proteins identified in VSCC.

Table III.

Involvement of extracellular matrix in VSCC.

Table III.

Involvement of extracellular matrix in VSCC.

Target proteinStudy techniquesResultsAuthors(Refs.)
Collagens (I, III, VI, XVI)Microscopy, proteomicsInduces lymph node metastasis in VSCC models. Collagens are implicated in the formation of a more aggressive tumor variant with lymph node metastasisCastor et al Holthoff et al(103,104)
OsteopontinISHElevated expression levels of osteopontin in VSCC samples, particularly in those with higher pathological gradesWu et al(105)
DystroglycanIHCReduced expression promotes VSCC progressionSgambato et al(106)
Integrin β1IFCStrong positive correlation between high integrin β1 expression and increased invasiveness of VSCCBrockbank et al(107)
CD44v3, CD44v6ICCHigher expression of CD44v3 and CD44v6 isoforms in VSCC samples, which correlated with poor patient survival rates and increased lymph node metastasisHefler et al(108)
MMP13IHC, TranscriptomicsHigh expression levels of MMP13, which were associated with the malignant transformation of vulvar epithelial cells in VSCCJohansson et al(109)
MMP2ICCElevated MMP2 expression levels in VSCC tissues, indicating a potential role in promoting tumor invasivenessBovo et al(110)
MMP12ISH, TranscriptomicsPositive correlation between MMP12 expression and the histological grade of VSCC tumors, suggesting a role in tumor progressionKerkelä et al(112)
TenascinIFCPromotes malignant transformation in VSCC cells, predominantly expressed in VIS, inflammatory preinvasive and invasive vulvar lesionsGoepel et al(113)
Integrin α5β1IHCPromotes malignant transformation of VSCC cellsSurico et al(114)
Laminin-5 γ2ICCLaminin-5 γ2 revealed a significant correlation with poor patient survival rates among VSCC casesHellman et al(115)

[i] VIS, vulvar intraepithelial neoplasia; ICC, immunocytochemistry; ISH, In-situ hybridization; WB, Western blotting; IHC, immunohistochemistry; IFC, immunofluorescence; VSCC, vulvar squamous cell carcinoma.

Collagens

Collagens, which are the predominant component of the ECM, are widely distributed across various types of tissue. With 28 different types, the collagen superfamily forms fibers, networks and filaments within the ECM, interacting with mesenchymal-origin cells through various receptor families to regulate their proliferation, migration and differentiation (116). While studies have extensively investigated the role of collagens in driving cancer invasion and metastasis, their specific involvement in VSCC remains understudied. Recent research utilizing Second Harmonic Generation imaging has analyzed collagen parameters (quantity, uniformity and organization) in VSCC, revealing associations with lymph node metastasis (103). Additionally, based on collagen organization, two morphologic variants have been identified in VSCC: An indolent type growing as ‘sheets of cells’ with a pushing border in lymphoplasmacytic stroma, and an aggressive variant growing as ‘single tumor cells’ with a finger-like border in fibromyxoid stroma (104). Proteomic analyses have further demonstrated that the aggressive variants are associated with higher rates of lymph node metastasis and tumor recurrences. Consistent with these findings, previous studies have shown a significant correlation between the ‘sheet of cells’ morphology, HPV infection and improved survival rate (8). Collectively, these findings suggest that morphological variants of collagen fibers in the TME may serve as prognostic indicators for aggressive VSCC. This highlights the potential significance of collagen parameters in understanding VSCC aggressiveness and may offer insights into therapeutic strategies targeting the tumor microenvironment.

Laminins

The laminin family, comprising of ~20 glycoproteins, forms a cross-linked web intertwined with the type IV collagen network in basement membranes. Laminins are heterotrimers composed of three polypeptide chains (α, β, γ) and play crucial roles in early embryonic development, organogenesis and various cell type-specific functions such as adhesion, differentiation, migration, phenotype maintenance and resistance to apoptosis (15). However, in tumors of the lower female genital tract, laminin expression becomes dysregulated (117). Prior research has emphasized that elevated expression of the γ2 chain of laminin-5 (LAMC2) is linked to patient survival in VSCC. Notably, intracytoplasmic expression of the γ2 chain along the invasive tumor front correlates with short-term survival. Larger tumors tend to exhibit increased γ2 chain expression, although no significant correlation has been observed with tumor staging. These findings suggest that heightened expression of the γ2 chain may be involved in the initiation of VSCC tumorigenesis rather than progression (115). However, further investigations are warranted to elucidate the dynamics of LAMC2 in VSCC tumorigenesis.

Osteopontin

Matricellular proteins form a diverse family of non-structural matrix glycoproteins, including thrombospondins, secreted acidic protein and rich in cysteine, tenascins, fibulins, osteopontin, cartilage oligomeric matrix protein and CNN family proteins such as periostin and R-spondins (116). Among these, osteopontin (OPN), initially identified as a bone matrix protein, is now recognized as a cytokine produced by activated T cells and transformed cells. It is highly inducible as it is expressed and secreted by both tumor cells and cells in the stroma (105). In VSCC, OPN expression was investigated across various stages of vulvar lesions, including VSCC, VIN, vulvar lichen sclerosus (VLS) and normal vulvar tissue samples. Proteomic analysis revealed a gradual increase in OPN expression from VIN to VLS, with the highest expression observed in VSCC tumor tissue samples. Additionally, OPN expression was found to be associated with the pathological stage, suggesting its potential role in VSCC tumor progression through neoplastic transformation (105). Collectively, this observation suggested that OPN could be a predictive biomarker for the early detection of VSCC, and further studies are required to understand VSCC pathogenesis through OPN.

Dystroglycan

Dystroglycan, a transmembrane glycoprotein, serves as a crucial link between the ECM and the intracellular cytoskeleton, thereby providing structural integrity. Comprising α and β components, dystroglycan facilitates cell adhesion to the ECM and plays a pivotal role in regulating cytoskeletal organization (118,119). Dysregulation of dystroglycan is a common occurrence observed in various human epithelial cancers, suggesting its potential involvement in tumor development (118,119). Notably, previous research has revealed disrupted expression levels of α-dystroglycan in conditions such as VLS, squamous cell hyperplasia, VIN and invasive VSCC. Specifically, decreased expression of α-dystroglycan has been observed across preneoplastic lesions of VSCC, and this downregulation is associated with advanced stages of VSCC. These findings suggest that α-dystroglycan may play a significant role in maintaining cytoskeletal dynamics, and its reduced expression could promote VSCC progression (106).

Integrins β1

Integrins, heterodimeric receptors comprising α and β subunits, are frequently dysregulated in skin cancers (107). Serving as bridging molecules, integrins connect ECMs with the cell cytoskeleton, governing cell adhesion and motility. The intracellular tail of integrin β1 associates with proteins such as talin, α-actinin and vinculin, linking it to the actin cytoskeleton and regulating cell motility, keratinocyte wound healing and the collective movement of tumor cells (115). Increased expression of various integrin (ITG) family proteins, including α2, α3, α5, α6 and β1 has been observed in VSCC. Among these, β1 (ITGB1) plays a pivotal role in mediating cell adhesion, migration and invasion (107). Knockdown experiments targeting β1 result in significant alterations in VSCC tumor morphology compared with control tumors. Specifically, β1 knockdown leads to a more encapsulated and less invasive tumor phenotype, indicating the crucial involvement of integrin β1 in VSCC invasiveness and disease progression (107). The present study underscores the significance of β1 integrin in VSCC tumor advancement and suggests potential therapeutic avenues for intervention.

Hyaluronic acid receptor CD44

Hyaluronic acid receptor CD44 is a surface-expressed glycoprotein that facilitates interactions with a spectrum of molecules, including collagen, fibronectin, OPN, MMPs and growth factors (70,71). CD44 plays a pivotal role in cell adhesion, interactions, migration and metastasis. CD44 isoforms bolster malignant cell affinity to ECM ligands, thereby fostering tumor dissemination (70,71). A previous study has demonstrated a significant association between CD44 variants, particularly CD44v3 and CD44v6 and VSCC tumor progression, as well as adverse patient outcomes (108). Elevated CD44 expression correlates with poor tumor differentiation, positive lymph node involvement, advanced-stage VSCC and diminished survival rates, indicating its potential as a prognostic marker (108).

MMPs

MMPs are a family of calcium-dependent, zinc-containing endopeptidases that target various molecules, including matrix components, growth factors, cytokines and signaling molecules. Synthesized as zymogens, MMPs are secreted after cleavage of their propeptide form. Invasion and metastasis of malignant cells involve the degradation of the stromal matrix, mediated by specific MMPs (120).

MMP2

MMP2 plays a pivotal role in degrading crucial components of basement membranes such as type IV collagen and fibronectin, facilitating the invasion of tumor cells into stromal and vascular regions (25,110). Overexpression of MMP2 has been observed across various disease stages of VSCC, including VIN (grades-I, II, III) and VLS and this heightened expression is significantly associated with the invasiveness of VSCC (110). Morphologically, MMP2 manifests as cytoplasmic granular or diffuse staining in stromal cells. However, in cases of invasive VSCC, MMP2-positive cells are notably observed in the stroma adjacent to neoplastic islands or infiltrating groups of tumor cells (110). These highly MMP2-expressing tumor cells secrete factors that contribute to the aggressiveness of VSCC, including invasion and metastasis, suggesting potential therapeutic approaches targeting MMP2.

MMP12

MMP12, recognized for its ability to degrade elastin and various substrates such as type IV collagen, fibronectin and laminin, plays a multifaceted role in cancer progression, particularly in VSCC. It contributes to limiting tumor growth by converting plasminogen into angiostatin, which inhibits endothelial cell proliferation and angiogenesis, essential processes for tumor vascularization (111). While typically associated with macrophages, MMP12 is also expressed by transformed epithelial cells in VSCC, with its expression level correlating with tumor dedifferentiation and histological aggressiveness (112). In a study involving 33 VSCC samples, MMP12 mRNA was prevalent, and higher expression in cancer cells was associated with more aggressive and poorly differentiated tumors (112). Notably, macrophage-derived MMP12 was more abundant in well-differentiated grade I tumors compared with grade III tumors (112). These findings suggest MMP12 potential role in modulating VSCC histology and influencing treatment strategies. However, further research is warranted to fully understand MMP12 implications in VSCC and its therapeutic relevance.

MMP13

MMP13, recognized for its ability to cleave fibrillar collagens and various stromal matrix components, stands out as a versatile proteolytic tool crucial for tumor cell invasion (16,116,120,121). A previous study has highlighted the abundant expression of MMP13 in VSCC tumor tissues, often correlating with lymph node metastasis (109). Moreover, in vitro investigations have revealed a significant increase in MMP13 levels in VSCC cell lines compared with control epithelial cells (109). These findings underscore MMP13 specific expression by malignantly transformed squamous epithelial cells, including VSCC cells, suggesting its potential as a marker for their invasive potential (109).

Elucidating molecular synergies: Cancer-associated fibroblasts (CAFs) and ECM in VSCC progression

Fibroblasts are the main architects of the ECM, orchestrating changes that play a major role in tumor progression, inflammation, therapy resistance and immunosuppression (9,122). CAFs are perhaps the cells most proficient at remodeling the ECM as they deposit collagens and release various growth factors, chemokines, cytokines and MMPs (Fig. 1A). Significantly altered gene pathways in CAFs include regulation of substrate adhesion, tissue remodeling, cell migration, secretion, growth regulation and angiogenesis (123). Although, at present, VSCC-specific subpopulations of CAFs have not been reported, single-cell RNA sequencing data suggests that various CAF subpopulations exist in the TME of other types of SCCs (124,125).

The most commonly identified CAF subpopulations are those involved in ECM remodeling [myofibroblast CAFs (myCAFs)] and immunomodulatory cancer-associated fibroblasts] (126). MyCAFs have been reported to be involved in tissue remodeling and often express ACTA2 gene (126). Inflammatory CAFs often exhibit increased IL-6 signaling in various tumor types (126129). This makes them potential targets for anti-IL-6 therapies, such as siltuximab and tocilizumab (130). Moreover, research has shown that immunoregulatory CAFs can activate JAK-STAT signaling in cancer cells (129), suggesting that inhibition of this pathway may be a promising therapeutic strategy.

Mounting evidence suggests that CAFs also play a key role in therapy-resistance in SCCs, particularly in head and neck SCC (HNSCC) and esophageal SCC (131133). It has been previously reported that chemotherapy promotes CAF survival and alters exosome biogenesis, which leads to malignant characteristics in HNSCC (134). Notably, CAFs also respond to radiotherapy by upregulating transforming growth factor β1 (TGFβ1) expression via IL-8/NF-κB signaling in HNSCC, which increases the rate of invasive growth. This signaling can be inhibited by using Tranilast, a known TGFβ1 inhibitor (135). A subset of CAFs have also been reported to be involved in TGFβ1 dependent PD-1+/TIM-3+ exhaustion of CD8 T cells in HNSCC, leading to exclusion of T cells, thereby negatively impacting immunotherapy response (124,136). Previously, we have shown that CAFs play a decisive role in VSCC invasion and that VSCC cells exhibit a fibroblast-dependent tumorigenic potential (137). However, there exists a significant heterogeneity with CAFs showing both tumor-promoting and tumor-inhibiting CAFs (9,122). Gaining a more profound insight into the molecular and phenotypic variations among CAF populations in VSCC may contribute to overcoming challenges related to therapy resistance and the targeting of cancer cells.

Decoding therapeutic prospects: ECM proteins in VSCC

The therapeutic potential of ECM proteins in treating VSCC holds promise for pioneering treatment strategies. Identifying specific ECM proteins involved in VSCC tumorigenesis will unveil potential therapeutic targets. While the pathways linked with ECM proteins in VSCC are not fully understood, emerging bioinformatic platforms (138) provide opportunities to pinpoint key pathways and potential targeted therapies for this relatively underexplored cancer. Notably, these proteins, irrespective of ECM organization, are implicated in modulating immune systems, as depicted in Fig. 2.

Despite the absence of reports on ECM proteins regulating immune compartments in VSCC, insights from other epithelial-origin tumors in The Cancer Genome Atlas suggests that investigating ECM in VSCC may be beneficial. Bioinformatics platforms such as TIMER2 (http://timer.cistrome.org/) (139) confirm that higher expression levels of ECM-related genes are associated with reduced CD8+ T cell infiltration within the TME, fostering immune evasion and tumor progression across various epithelial cancers (140143) (Figs. 3 and 4). Consequently, over the last few decades, several ECM inhibitors have been developed and successfully employed across different SCCs (Table IV) (144158). Therefore, understanding the intricate relationship between ECM components in the context of VSCC is essential for devising innovative therapeutic strategies tailored to this patient population. Such endeavors hold the potential to pave the way for the emergence of novel therapeutics.

Table IV.

Summary of extracellular matrix components inhibitors across human cancers.

Table IV.

Summary of extracellular matrix components inhibitors across human cancers.

A, Integrin inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)
AbituzumabMonoclonalIntegrin αVPC, CCPhase IIPFS not significant(144)
(EMD525797)Ab
Intetumumab (CNTOMonoclonalIntegrin αVMelanoma, PCPhase IIPFS not significant(144)
95)Ab
Vitaxin (MEDI-523)MonoclonalIntegrin αVβ3Metastatic cancersPhase IINo tumor regression(144)
Ab
EtaracizumabMonoclonalIntegrin αVβ3MelanomaPhase IIPFS not significant(144)
(MEDI-522, Abegrin)Ab
Cilengitide (EMDInhibitoryIntegrinMultiple cancers, GBPhase IIOS not significant(144)
121974)peptideαVβ3,
Integrin αVβ5
Volociximab (M200)MonoclonalIntegrin αVβ1Pancreatic, NSCLC,Phase IIPartial or no significant(144)
Ab OC, Peritoneal, RC effects
NatalizumabMonoclonalIntegrin α4MMPhase IINo results(144)
Ab
ATN-161InhibitoryIntegrin α5β1GBM, RC and otherPhase I/IINo therapeutic benefits(144)
peptide solid cancers

B, MMP inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

Batimastat (BB-94)Zinc chelatorMMP-1, 2, 3,Pancreatic, CC, GC,Phase IIIDeveloped toxicity(145)
7, 9, 14OC,(cancelled)
Cholangiocarcinoma,
Mesothelioma,
NSCLC, BC,
Melanoma, RC
Marimastat (BB-Zinc chelatorMMP-1, 2, 3,BC, NSCLC, CC,Phase IIIProlongation of survival(145)
2516) 7, 9Pancreatic, GC, PC,(cancelled)in randomized Ph-II
GBM in gastric cancer
Tanomastat (BAYzinc chelatorMMP-2, 3, 8,Pancreatic, OC,Phase IIIDeveloped toxicity(145)
12-9566) 9, 13NSCLC(cancelled)
Andecaliximab (GS-MonoclonalMMP-9GC, BC, Pancreatic,OngoingDeveloped toxicity(145)
5745)Ab NSCLC, ESCC, CCphase I, II
III
AB0041, AB0046,MonoclonalMMP-9CCPreclinicalData not available(145)
GS-5745Ab
DX-2400MonoclonalMMP-14BC, Melanoma,PreclinicalData not available(145)
Ab Fibrosarcoma
Intetumumab (CNTOMonoclonalMMP-1,2, 3BCPreclinicalData not available(145)
95)Ab

C, Osteopontin inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

100D3 and 103D6MonoclonalOsteopontinColonPreclinicalPromotes antitumor(146)
Ab immune responses
Simvastatin, Cetuximab,InhibitorsOsteopontinColon, PC, BCPreclinicalInhibiting Osteopontin(146)
andrographolide and expression
parecoxistep
ParecoxibCOX-2OsteopontinCCPreclinicalInhibiting Osteopontin(147)
inhibitor expression

D, Laminins inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

HYD1InhibitoryLaminin-5PCPreclinicalTumor growth(148)
peptide suppression
G45MonoclonalLaminin-332SCCPreclinicalTumor growth(149)
Ab suppression

E, CD44 inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

VFF18MonoclonalCD44SCCPreclinicalPromising targeting(150)
Ab vehicle for
radioimmunotherapy
cMAb U36MonoclonalCD44HNSCCPreclinicalBiomarker of early(151)
Ab detection

F, Collagen inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

BaicaleinAntioxidantCol-ILC, Osteosarcoma,PreclinicalInhibiting Col-I(152)
Bladder, BC, PC, transcription
CSCC, HNSCC
Phenylbutyrate, sodiumFatty acidCol-ILC, PC, BC, OC,PreclinicalDecreases collagen(152)
phenylbutyrate Bladder synthesis
Ethyl 3,4-dihydroxybenzoateAntioxidantCol-ICC, BCPreclinicalDecreases collagen(152)
(EDHB), 2-(5- synthesis
carboxythiazol-2-yl)
pyridine-5-carboxylic
acid (pythiDC)
MinoxidilSyntheticCol-IPC, BC, OCPreclinicalDecreases collagen(152)
compound synthesis
GalunisertibRTK-Col-XIOC, Pancreatic, BCPhase IIDecreases collagen(152)
(LY2157299)inhibitor synthesis
SC66AKT-Col-XIOC, Pancreatic, BCUnder trialDecreases collagen(152)
inhibitor synthesis
ClostridiumCollagenaseCol-I, IIIUterine leiomyoma,Phase I/IIDecreases tumor(153)
Histolyticum (EN3835) Lipoma burden
TRC093MonoclonalCollagensLocally advanced orPhase IDose escalation study
Ab metastatic solid
cancers

G, Periostin inhibitors in cancer

InhibitorTypesTargetsCancerStatusResults(Refs.)

Anti-PN peptideInhibitoryPeriostinBCPreclinicalImproving doxorubicin(154)
peptide sensitivity
PN21-AbMonoclonalPeriostinBCPreclinicalPromotes(155)
Ab chemosensitivity
α-periostinMonoclonalPeriostinCCPreclinicalPromotes(156)
Ab chemosensitivity
MZ-1MonoclonalPeriostinOCPreclinicalTumor growth(156)
Ab suppression
PNDA3DNAPeriostin,BCPreclinicalTumor growth(157)
aptamersIntegrin suppression
(αVβ3, αVβ5)
PNDA3DNAPeriostinGCPreclinicalReducing metastasis(158)
aptamers and angiogenesis

[i] PC, prostate cancer; CC, colorectal cancer; GBM, glioblastoma; NSCLC, non-small cell lung cancer; OC, ovarian cancer; RC, renal cancer; GC, gastric cancer; BC, breast cancer; LC, lung cancer; MM, multiple myeloma; ESCC, oesophageal squamous cell carcinoma; CSCC, cervical squamous cell carcinoma; HNSCC, head and neck squamous cell carcinoma; SCC, squamous cell carcinoma; Ab, antibody; Col, collagen; PFS, progression-free survival; OS, overall survival; RTK, receptor-tyrosine kinase.

Exploring future avenues: Research directions in VSCC and ECM interactions

The present study thoroughly investigated the intricate landscape of the ECM in VSCC, examining the roles of various components such as collagens, laminin, osteopontin, dystroglycan, integrin, CD44 and MMPs in VSCC progression. Furthermore, the present study highlights the evolving understanding of ECM, going beyond its structural role to actively influence adhesion, proliferation and cell communication. Attention is provided to collagen types, emphasizing their structural significance and their correlation with changes in collagen levels and lymph node metastasis in VSCC.

Conclusion

The present study acknowledges the rising incidence of vulvar cancer and the limitations of current treatment approaches, particularly in incurable or metastatic cases. It advocates for the exploration of novel therapeutic pathways and targets based on the detailed analysis of ECM components in VSCC. Recognizing the complex interactions within the TME underscores the necessity for innovative and targeted therapeutic approaches to enhance outcomes for individuals affected by VSCC. Further research and clinical exploration of these ECM targets could pave the way for more effective therapeutic strategies in the management of VSCC.

Acknowledgements

The results shown here are in part based upon data generated by the TCGA Research Network: https://www.cancer.gov/tcga.

Funding

This work was supported by the Research Council of Norway through its Centers of Excellence funding scheme (grant no. 22325).

Availability of data and materials

Not applicable.

Authors' contributions

EI and KCD conducted the literature review and drafted the manuscript. RM, KO, SI and HND contributed to the writing of the manuscript and made corrections. All authors have read and approved the final manuscript. Data authentication is not applicable.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Spandidos Publications style
Islam ME, Debnath KC, Moniruzzaman R, Okuyama K, Islam S and Dongre HN: Biological implications of decoding the extracellular matrix of vulva cancer. Oncol Rep 53: 19, 2025.
APA
Islam, M.E., Debnath, K.C., Moniruzzaman, R., Okuyama, K., Islam, S., & Dongre, H.N. (2025). Biological implications of decoding the extracellular matrix of vulva cancer. Oncology Reports, 53, 19. https://doi.org/10.3892/or.2024.8852
MLA
Islam, M. E., Debnath, K. C., Moniruzzaman, R., Okuyama, K., Islam, S., Dongre, H. N."Biological implications of decoding the extracellular matrix of vulva cancer". Oncology Reports 53.2 (2025): 19.
Chicago
Islam, M. E., Debnath, K. C., Moniruzzaman, R., Okuyama, K., Islam, S., Dongre, H. N."Biological implications of decoding the extracellular matrix of vulva cancer". Oncology Reports 53, no. 2 (2025): 19. https://doi.org/10.3892/or.2024.8852