Probable Role of Antibody Targeting Nectin-4 in the Treatment of Cancer

    

    

    Figure 1: Structure pattern diagram of Nectin-4 [1].
    

The Investigation and Clinic Trials of Nectin-4 in Various Cancer

Breast Cancer

In a sample of 140 breast cancer samples, 63.5% of breast cancer tissues had Nectin-4 positive expression, and the increased Nectin-4 expression was significantly related to tumor grade (P<0.0001), tumor size (P<0.0001) and survival (P<0.0001) [4].

In another 5673 cases of invasive breast cancer, the expression of mRNA and immunohistochemical staining showed that Nectin-4 expression was not detected in adult healthy tissues (including breast). But the expression rate of three negative breast cancer samples was 61%, and the expression rate in basal like tumors (basal) was 62%. In non three negative breast cancer samples, or non basal like tumors (non-basal), the expression rate was 47%. Further statistical analysis showed that high expression of nectin-4 was much correlated with poor prognosis [4].

In addition to the expression on the surface of tumor cell membrane, high levels of soluble Nectin-4 molecules (43 kDa) were detected in the serum of patients with metastatic breast cancer. And soluble Nectin-4 was composed of extracellular segments of the whole Nectin-4.

Therefore, Nectin-4 can also is used as a specific serum marker for the diagnosis and follow-up of breast cancer and other kinds of cancer [5-10].

Lung Cancer

An immunohistochemical staining of 422 cases of Non-Small Cell Lung Cancer (NSCLC) showed that 245 cases (58.1%) displayed strong staining, 119 cases displayed mild staining (28.2%), 58 cases were not stained (13.7%). And no staining was found in adjacent normal lung tissues.

Moreover, the high expression of Nectin-4 is closely related to the poor prognosis of lung cancer. And the survival time of patients with high expression of Nectin-4 is shorter than that of patients with no/weak expression of Necitn-4 [11].

Ovarian Cancer

In a trial using immunohistochemical staining to simultaneously analyze the specimens of 500 patients with ovarian cancer, 48.6% of ovarian cancer tissues showed positive expression of Nectin-4. In addition, soluble Nectin-4 was detected in 27(53%) of 51 patients with serous ovarian cancer, 4(29%) of 14 patients with clear cell carcinoma and 8(16%) of 51 patients with benign gynecological diseases [12]. Moreover, several studies have found that the high expression of Nectin-4 is closely related to the poor prognosis of ovarian cancer [9,10,13].

Liver Cancer

In a study of 107 liver cancer samples, it was found that the mRNA and protein levels of Nectin-4 were higher in liver cancer tissues than in adjacent non tumor tissues. Immunohistochemical staining showed that 67.82% (59/87) of HCC tissues were over expressed. The expression of Nectin-4 was significantly correlated with tumor size (P=0.029), metastasis status (P=0.023), vascular invasion (P=0.018) and tumor lymph node metastasis (P=0.003). In addition, Kaplan Meier survival analysis showed that positive Nectin-4 expression was closely associated with poor recurrence free survival (RFs, P=0.006) and overall survival (OS, P=0.005) [14].

Gastric Cancer

Nectin-4 can promote the growth and migration of human gastric cancer cells and promote the progression of gastric cancer. In a study of 64 patients with gastric cancer, the authors found that the high expression of Nectin-4 was significantly correlated with lymph node metastasis (P=0.025) and TNM stage (P=0.006). Among the 64 patients, 39 died, including 33 cases with high expression of Nectin-4 protein and 6 cases with low expression of Nectin-4 protein. The expression of Nectin-4 was higher in 13 surviving patients, lower in 12 surviving patients. Moreover, in patients with gastric cancer, the 5-year survival rate in the high Nectin-4 expression group was significantly lower than that in the low Nectin-4 expression group [15].

Esophageal Cancer

In a study of 94 esophageal cancer samples, the authors detected the mRNA levels of four genes: Nectin-1, Nectin-2, Nectin-3 and Nectin-4. It was found that only Nectin-4 was specifically expressed in esophageal cancer samples. Immunohistochemical staining showed that the positive staining of Nectin-4 could be seen on the cell membrane of esophageal cancer, while only weak or negative staining of Nectin-4 could be seen in normal esophagus. Survival analysis showed that the overall survival rate of patients with high expression was lower than that of patients with low expression (HR=1.704, 95% ci1.027-2.825, P=0.039) [16].

In addition, the expression of Nectin-4 in colorectal cancer [17], gallbladder carcinoma [18], bladder cancer [19] and pancreatic cancer [20] was closely related to the poor prognosis of patients.

Nectin-4 is a molecule that promotes the occurrence and progression of many kinds of tumors. It is widely expressed in breast cancer, ovarian cancer, lung cancer, urothelial carcinoma, esophageal cancer, liver cancer, colorectal cancer, gastric cancer, gallbladder cancer, bladder cancer and pancreatic cancer. Basically, it is not expressed in normal tissues. Therefore, it is a specific tumor associated antigen molecule.

The Function Mechanism of Nectin-4

Interaction with Afadin Protein

In epithelial cells, Nectin-4 and afadin are Co located at the adhesion junction dominated by cadherin. Nectin-4 interacts with the PDZ domain of afadin through the C-terminal intracellular motif [21]. Andafadin can interact with F-actin, tightly connected components (such as closed band ZO-1, connecting adhesion molecule jam), adhesion connecting components (such as ponsin), cytoskeleton regulatory protein profilin And Ras protein, participate in signal transduction and regulate cell proliferation. The high expression of Nectin-4 eventually causes the deformation of cancer cells, the extension of cell processes and the formation of lamellar pseudopodia, which improves the ability of tumor migration and invasion [11].

The Activation of PI3K/Akt Signal Pathway

In a breast cancer metastasis model, Nectin-4 is a marker of Breast Cancer Stem Cells (BCSCs). Nectin-4 activates the WNT/beta-Catenin signaling pathway through PI3K/AKT kinase molecules to achieve self-renewal of breast cancer stem cells. In vitro, in vivo and clinical pathological data show that the upreg ulation of Nectin-4 expression is closely related to the activation of Wnt/beta catenin signaling pathway, the proliferation of cancer stem cells, Epithelial Mesenchymal Transformation (EMT), the metastasis and invasion of tumor cells [22]. In a study of gastric cancer model, it was found that the gastric cancer tumor cell line SGC-7901 over expressing Nectin-4 showed faster cell growth ability and sensitivity to cell growth. And the migration ability of SGC-7901 cells over expressing Nectin-4 was enhanced compared with the control group. In the experiment of tumor bearing mouse model, the weight and volume of tumor growth were significantly larger than those in the control group after injection of gastric cancer cell line over expressing Nectin-4. The results of further biochemical experiments also show that nectin-4 participates in the proliferation and migration of gastric cancer cells through PI3K/Akt pathway. And nectin-4 may play a potential role in promoting cell proliferation [15]. Investigations in gallbladder cancer have also shown that Nectin-4 promotes the proliferation, migration and tumor growth of gallbladder cancer cells through PI3K/Akt pathway [18].

The Promotion of Angiogenesis

The intratumoral angiogenesis model established by highly metastatic breast cancer cells and human umbilical vein endothelial cells (HUVECs) can be used to research the contribution of Nectin-4 to angiogenesis systematically. In vivo and in vitro evidence shows that Nectin-4 can promote angiogenesis. Metastatic Breast Cancer Stem Cells (mBCSCs) drive ADAM-17 expression after hypoxia, resulting in the exfoliation of Nectin-4 into the microenvironment. It interact with integrin-beta 4 on endothelial cells. This interaction promotes angiogenesis within tumors through Src, PI3K, AKT, and iNOS pathways [23].

Marketed Drugs

ADC: Enfortumab Vedotin

The Antibody Drug Conjugate (ADC) Enfortumab vedotin, developed jointly by Seattle genetics and Astellas Pharma, is formed by coupling the human IgG1 monoclonal antibody enfortumab (clone No.: ags-22ce) targeting Nectin-4 with the cytotoxic agent MMAE (monoclonal auristatin E), which is connected to the antibody of Nectin-4 through protease cleavage linker. It is used to treat patients with locally advanced or metastatic urothelial carcinoma. Information on several clinical trials is summarized below.

Ev-101 (clinicaltrials.gov No.: nct02091999): Ev-101 is a phase I clinical trial to evaluate the pharmacokinetics, immunogenicity, safety and antitumor activity of enfortumab vedotin in patients with urothelial carcinoma and other malignant solid tumors expressing Nectin-4. According to the clinical trial of 112 patients, the ORR of Enfortumab vedotin was 42% (Cr, n=5; PR, n=42). ORR was 42% (95% CI 31.2-52.5) and 36% (95% CI 20.4-54.9) in patients treated with checkpoint inhibitor and liver metastasis, respectively. The 1-year Overall Survival (OS) was 51.6% (95% CI 40.3-61.8) and 42% (95% CI 25.0-58.0), and the median OS was 12.2 months (95% CI 8.5-17.1) and 10.4 months (95% CI 6.4-14.1); Median Progression Free Survival (PFS) was 5.4 months (95% CI 5.1-6.3) and 3.5 months (95% CI 1.6-6.6).

The most common adverse reactions were fatigue (53%), hair loss (46%) and loss of appetite (42%). Grade 3 adverse reactions occurred in ≥5% of patients, including anemia (8%), hyponatremia (7%), urinary tract infection (7%) and hyperglycemia (6%). In addition, 4 cases of death caused by side effects of drugs (respiratory failure, urinary tract obstruction, diabetic ketoacidosis and multiple organ failure) were reported in [24,25].

Ev-201 (clinicaltrials.gov No.: nct03219333): Ev-201 is a global, clinical phase II, two cohort, single group trial to evaluate the safety and efficacy of intravenous injection of 1.25mg/kg Enfortumab vedotin in patients with advanced urothelial cancer who have previously been treated with platinum chemotherapy and checkpoint inhibitors. The results showed that among 303 enrolled patients, the ORR was 44% (95% CI 35.1-53.2), the CR rate was 12%, and the PR rate was 32% [24].

Ev-103 (clinicaltrials.gov No.: nct03288545): Ev-103 is a clinical phase I, dose increasing and dose expanding trial. Enfortumab vedotinis used in combination with chemotherapy or immunotherapy in patients with urothelial carcinoma. The preliminary results of Ev-103 showed that in most patients, the combination of Enfortumab vedotin and pembrolizumab reduced the tumor, with an ORR of 71% (32/45; 95% confidence interval 55.7-83.6). The CR rate was 13% (6/45); 58% (26/45) had PR, and 22% (10/45) had stable progression. ≥grade 3 treatment-related adverse reactions were rash (11%; 5/45), hyperglycemia (7%), and peripheral neuropathy (4%; 2/45). These rates are similar to those of monotherapy using Enfortumabvedotin [24,26].

Padcev submitted applications for two clinical trials in China October 2020. Padcev is an antibody drug conjugate targeting Nectin-4. The indication approved in the United States is to treat locally advanced or metastatic urothelial carcinoma (UC, the most common type of bladder cancer).

9mw2821 of Mabwell Biology is a new ADC drug targeting Nectin-4 based on ADC drug development platform and automatic high-throughput hybridoma antibody molecular discovery platform. 9mw2821 has uniform structure and is easy to be industrialized. It showed good drug formation in vitro pharmacodynamic activity, in vivo metabolic properties and preliminary safety. It has good anti tumor effect in a variety of animal tumor models. Its clinical value will be revealed in the next clinical trial.

Antibody

Sbt6290 is an antibody candidate drug targeted by Nectin-4 developed by Silverback Therapeutics using its proprietary immunotac technology platform that can be delivered systematically. At the 2021AACR conference, the company announced the preclinical research results of the candidate drug, indicating that Sbt6290 can activate human myeloid cells and showed single drug antitumor activity in mouse trials.

Bicycle Toxin Conjugate

Bt8009, which is a BTC drug targeting Nectin-4, is under development by Bicycle Therapeutic [27]. It is currently in phase 1/2 clinical trial, which is carried out in patients with advanced solid tumors related to the expression of Nectin-4.

As a cutting-edge biotechnology company, Bicycle Therapeutics is developing a new type of drugs - Bicyclic Peptides, also known as bicycles. It is reported that the molecular weight of these drugs is 50-100 times smaller than that of typical antibody coupled drugs. They are expected to completely penetrate the tumor and have more advantages in tumor antigen targeting. Bt8009 has shown better anti-tumor activity in preclinical research.

Conclusion

In short, Nectin-4 has been a fully validated tumor antigen, especially the birth of the first ADC drug targeting Nectin-4, which proves that it is an effective target for the development of tumor drugs. It also lays a foundation for the development and identification of ADC drugs and other new drug categories.

Although the number of R&D pipelines targeting nectin-4 has not been reported so far. However, with the further advancement of relevant research, it is expected that more antibody drugs, ADC drugs and other new drugs targeting Nectin-4 will enter clinical trials and shine in more cancer treatment fields in the future.

Author Statements

Conflicts of Interest

There are no conflicts of interest.

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