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J Cancer 2017; 8(3):410-416. doi:10.7150/jca.17144 This issue Cite

Review

Nivolumab as Programmed Death-1 (PD-1) Inhibitor for Targeted Immunotherapy in Tumor

Liting Guo, Haijun Zhang, Baoan Chen

Department of Hematology and Oncology (Key Department of Jiangsu Medicine), The Affiliated Zhongda Hospital, Medical School of Southeast University, Nanjing.

✉ Corresponding author: Baoan Chen. Department of Hematology and Oncology (Key Department of Jiangsu Medicine), The Affiliated Zhongda Hospital, Medical School of Southeast University, Dingjiaqiao 87, Gulou District, Nanjing 210009, Jiangsu Province, People's Republic of China. Tel +86 25 8327 2006 Fax +86 25 8327 2011 Email cba8888com. More

Abstract

Targeted immunotherapy has become the most promising approach for tumor patients. Programmed death-1 (PD-1), an inhibitory receptor expressed on activated T cells, can reverse immune suppression and release T cell activation. Nivolumab, a fully human immunoglobulin G4 PD-1 immune checkpoint inhibitor antibody, blocks PD-1 and promotes antitumor immunity, and it is effective for treating non-small-cell lung cancer (NSCLC), melanoma, renal cell carcinoma (RCC) and other cancers. The present review summarizes the efficacy and current status of clinical trials of nivolumab and that enabled nivolumab to be investigated in patients.

Keywords: nivolumab, programmed death-1 inhibitor, targeted immunotherapy.

Introduction

Targeted immunotherapy as a potential treatment for cancer has been intensively studied over the past decade based on the concept of the underlying principles of tumor biology and immunology [1,2]. Cancer immunotherapy comprises a variety of treatment approaches, including active immunotherapeutic strategies, such as cancer vaccines, and passive immunotherapies, such as monoclonal antibodies (mAbs) or adoptive transfer of tumor-specific T cells [3-5]. Tumor cells often involve in multiple resistance mechanisms that they may evade the host-tumor immune system [4,6,7]. However, immune system checkpoint inhibitors that mediate T-cell response have shown significantly enhance antitumor immunity [8,9]. Cytotoxic T-lymphocyte- associated antigen 4 (CTLA-4, also known as CD152), with its ligands CD80 and CD86, an inhibitory receptor as a global immune checkpoint engaged in priming immune responses via downmodulating the initial stages of T-cell activation, was the first clinically validated checkpoint pathway target [5,9,10]. Programmed cell death-1 (PD-1, also known as CD279) is another inhibitory receptor expressed on activated T and B cells, which normally function to dampen the immune response [11-14]. PD-1 is engaged by ligands PD-L1 (B7-H1, CD274) and PD-L2 (B7-DC, CD273), which are expressed by tumor cells and infiltrating immune cells [10,13]. Inhibition of the interaction between PD-1 and PD-L1 can enhance anti-tumor responses, delay tumor growth, and facilitate tumor rejection [7,15]. Furthermore, immune checkpoint blockade facilitated tumor cell destruction is a strategy for cancer immunotherapy [16,17]. PD-L1 is highly selectively expressed on tumor infiltrating lymphocytes (TILs) from many tumors [7,8]. The recent preclinical and clinical data have shown that PD-L1 expression is associated with worse prognosis in renal cell carcinoma (RCC) and non-small-cell lung cancer (NSCLC), while with good prognosis in melanoma [18].

Nivolumab (BMS-936558, ONO-4538, or MDX1106, trade name Opdivo; Bristol-Myers Squibb, Princeton, NJ, USA) is the first-in-human immunoglobulin G4 (IgG4) PD-1 immune checkpoint inhibitor antibody that disrupts the interaction of the PD-1 receptor with its ligands PD-L1 and PD-L2, thereby inhibiting the cellular immune response [14,15,19]. The anti-PD-1 antibody nivolumab was approved by the US Food and Drug Administration (FDA) for the treatment of melanoma in 2014 and RCC in 2015, nivolumab also has received the FDA approval in March 2015 for squamous lung cancer treatment, and on October 9, 2015, the FDA expanded the nivolumab for metastatic NSCLC [20-22]. We now report the mechanism, pharmacokinetics, and pharmacogenetics of nivolumab, in addition to further clinical experiences of nivolumab in the treatment of NSCLC and other cancers.

Generation and mechanism

Nivolumab is a genetically engineered anti-PD-1 mAb, developed by immunizing transgenic mice for human immunoglobulin loci with recombinant Chinese hamster ovary cells expressing human PD-1 and PD-1/human IgG1 Fc fusion protein [4,23,24]. Nivolumab contains a hinge region mutation (S228P), the S228P mutation reduces Fc exchange with serum IgG4 molecules to improve stability and reduce therapeutic variability [24]. Nivolumab binds PD-1 with high affinity (K_D=2.6 nmol/L by Scatchard analysis to polyclonally activated human T cells), blocks its interactions with both PD-L1 and PD-L2, and stimulates memory response to tumor antigen-specific T cell proliferation (Figure 1) [4,24].

Pharmacokinetics and pharmacodynamics

The recommended dosage of nivolumab is 3.0 mg/kg administered intravenously over 60 minutes every 2 weeks until disease progression or unacceptable toxicity [25,26]. Nivolumab has linear pharmacokinetics (PK), with a dose-proportional increase in the maximum concentration (Cmax) and area under the concentration-time curve (AUC) [4,15,23]. Based upon the study of Brahmer et al, the median time to the peak concentration of nivolumab was 1-4 hours after the start of infusion, and serum half-life (t_1/2) was 12 days (0.3, 1.0 or 3.0 mg/kg) to 20 days (10.0 mg/kg) [4,23,24]. The pharmacodynamics (PD) of nivolumab was evaluated according to PD-1 receptor occupancy on circulating CD3⁺ T cells (Figure 2) [15]. PD-1 occupancy appeared to be dose-independent, with a mean peak occupancy of 85% at 4-24 hours and average plateau occupancy of 72% observed at 57 days and beyond [4]. In addition, the median PD-1 receptor occupancy rate by nivolumab treatment was 64%-70% for 65 patients with melanoma in peripheral blood mononuclear cells (PBMCs), who were treated with one cycle of nivolumab at a dose of 0.1 to 10.0 mg/kg every 2 weeks [15]. All these data indicated nivolumab has a high affinity for PD-1 [4,15,23-27].

 Figure 1 

Schematic illustration of the mechanism of nivolumab as IgG4 PD-1 immune checkpoint inhibitor antibody. Notes: Nivolumab prevents the binding of PD-1 to its ligands PD-L1 and PD-L2. This binding releases PD-1 pathway mediated immune responses against tumor cells. Abbreviations: IgG4, immunoglobulin G4; PD-1, programmed death-1; PD-L1, programmed death ligand-1; PD-L2, programmed death ligand-2.

 Figure 2 

Pharmacodynamics of nivolumab. Notes: PD-1 occupancy on circulating CD3+ T cells after one infusion of nivolumab is shown for patients each receiving 0.1, 0.3, 1.0, 3.0 or 10.0 mg/kg. Abbreviations: PD-1, programmed death-1.

Clinical trials

The efficacy of nivolumab for the treatment of tumors has been investigated in several clinical trials, including various Phase I, II, and III studies on registry (Table 1).

Phase I

Nivolumab in lung cancer

Lung cancer is the leading cause of cancer death, approximately 27% of all annual cancer deaths in the world [28]. NSCLC represents 85% of all lung cancers and can be divided in two histological subgroups: squamous cell and non-squamous cell lung cancer [29]. Immunosurveillance mechanisms as new models of immunology have recently developed new generation of immune modulators in NSCLC, particularly for patients with squamous cell disease [29,30]. Encouragingly, the advent of immunotherapy in lung cancer is entering a new era [29]. The first in-human phase I nivolumab trail, was designed as an open-label multi-institutional study [4]. The trial consisted of a subgroup of 39 patients with refractory solid tumors including NSCLC, advanced metastatic melanoma, colorectal cancer (CRC), castrateresistant prostate cancer (CRPC) , and RCC [4,24]. Patients were treated with intravenous (iv.) dose of nivolumab at 0.3, 1.0, 3.0 or 10.0 mg/kg. Nivolumab was well tolerated, no dose-limiting toxicities were observed after one dose, and the maximum tolerated dose was not defined [4,28]. Based on these promising data, an expanded cohort of patients with advanced melanoma, NSCLC, CRPC, RCC or CRC was subsequently enrolled [15]. The expansion trial recruited 296 patients, and consisted of 122 patients with NSCLC. NSCLC patients treated with nivolumab at a dose of 1.0, 3.0, and 10.0mg/kg, the objective response rate (ORR) was 6%, 32%, and 18%, respectively [15]. Updated results presented in abstract, median overall survival (mOS) was 9.2 months and 9.6 months for squamous and non-squamous NSCLC, respectively [31]. Adverse events (AEs) were also observed, the most common grade 3 or 4 AEs were fatigue, pneumonitis, and elevated AST (2% each) [15,31]. In an expansion cohort of the Phase I study in previously treated NSCLC patients, the mOS was 9.2-14.9 months [32,33]. In this phase I of Gettinger et al, they reported the results of first-line nivolumab in chemotherapy-naïve advanced NSCLC [34]. The ORR was 30%, and the median progression-free survival (mPFS) was 29.6%. Interesting, also in Gettinger et al study, 129 patients with heavily pretreated advanced NSCLC received nivolumab (1.0, 3.0, or 10.0 mg/kg) intravenously once every 2 weeks, the mOS was 9.9 months [14]. A total of 56 patients with advanced NSCLC were enrolled and the phase I trial assigned by Antonia et al, it focused on platinum-based doublet chemotherapy (PT-DC) in advanced NSCLC. The ORR was 33% (nivolumab 10 mg/kg (N10) + gemcitabine (gem) / cisplatin (cis) [squamous (sq)]), 47% (N10 + pemetrexed (pem) /cis [non-sq]), 47% (N10 + paclitaxel (pac) / carboplatin (carb) [sq + non-sq]) and 43% (nivolumab 5 mg/kg (N5) + pac/carb [sq + non-sq]), respectively [35].

Nivolumab in melanoma

Melanoma represents less common than other skin cancers, but the fatality rate is higher [36]. Malignant melanoma has frequent metastatic property, and highly been resistant to conventional cytotoxic chemotherapy. However, with the recent emergence of immune checkpoint inhibitors and molecular-targeted agents, the therapeutic landscape for advanced melanoma has recently changed considerably [36,37]. The phase I clinical trial of Topalian et al studied the effects of nivolumab for 296 patients, of 94 patients with melanoma, the PFS was 41% [15,23,37]. Another dose-escalation, cohort expansion study evaluated the antitumor activity and safety phase I trial tested nivolumab in 107 melanoma patients [13]. Patients administered intravenously once every 2 weeks, setting in 8-week treatment cycles at the dose of 1.0, 3.0, or 10.0 mg/kg. The mPFS was 3.7 months [13,37]. In the third phase I study, 90 patients with vaccine in ipilimumab-refractory or -naive melanoma received nivolumab at 1.0, 3.0, or 10.0 mg/kg, with or without a multipeptide vaccine [38]. Among 87 evaluable patients, the ORR for nivolumab with or without vaccine was 25% [38,39]. Wolchok et al also conducted a phase I trial of nivolumab combined with ipilimumab in patients with advanced melanoma, all 86 patients were enrolled in the study [40]. In the concurrent-regimen group, 53 patients received nivolumab and ipilimumab every 3 weeks for four doses and nivolumab alone, the ORR was 40%. In the sequenced-regimen cohorts, 33 patients pretreated with ipilimumab received nivolumab every 2 weeks, the ORR was 20% [39,40].

Nivolumab in RCC

RCC is the third most common cause of urological malignancy in the world [41]. Unfortunately, RCC is largely resistant to radiation and chemotherapy, RCC mortality rates have steadily increased [41,42]. However, in recent years, molecularly targeted therapies shift the traditional treatment mode of RCC, including nivolumab [42]. In the initial Phase I trial of nivolumab published by Brahmer et al, two (RCC and melanoma) PRs were observed [4,24,43]. Another Phase I trial, 34 previously treated patients with metastatic RCC (mRCC) received nivolumab at the 1.0 and 10.0 mg/kg dose levels [44]. The median duration of response was 12.9 months [24,43,44].

Nivolumab in Hodgkin's lymphoma

Classical Hodgkin's lymphoma accounts for approximately 10% of all malignant lymphomas, however, 25% of them experience either primary or secondary chemorefractoriness or disease relapse [45]. Fortunately, nivolumab could inhibit immune evasion by the PD-1 pathway with Reed-Sternberg cells in Hodgkin's lymphoma [46]. Increasing preclinical and clinical research have demonstrated that nivolumab has substantial therapeutic activity and a satisfactory safety profile [46,47]. In this ongoing phase I trial, 23 patients with relapsed or refractory Hodgkin's lymphoma treated with nivolumab at the dose of 1.0 or 3.0 mg/kg for a maximum of 2 years [47]. The response rate (RR) was 87%, with a CR of 17%, a PR of 70%, and stable disease of 13% [47].

Phase II

Nivolumab in lung cancer

Based on these Phase I data, a randomized single-arm Phase II trial was launched to assess activity and safety of nivolumab for patients with advanced, refractory squamous NSCLC [48]. 117 patients with histologically or cytologically documented stage IIIB or IV squamous NSCLC were treated with a dose of 3.0 mg/kg according to the results of Phase I trials. The results showed that mPFS was 1.9 months, and mOS was 8.2 months, AEs was consistent with the phase 1 trial [28,48].

Nivolumab in melanoma

A double-blind phase II trial involving 142 patients with previously untreated metastatic melanoma were randomly assigned (2:1) to combination therapy (nivolumab and ipilimumab) and ipilimumab monotherapy (ipilimumab and placebo) [23,49]. Among patients with BRAF wild-type tumors, the ORR was 61% in the combination group versus 11% in the ipilimumab monotherapy group [49]. The mPFS of combination therapy was not reached and ipilimumab monotherapy was 4.4 months [49].

Nivolumab in RCC

Based on evidence of activity in the phase I trial, a blinded, randomized, multicenter phase II trial by Motzer et al investigated the activity and safety of nivolumab in patients with previously treated mRCC [24,50]. In the study, 168 patients were randomized to the nivolumab 0.3, 2.0, and 10.0 mg/kg. As expected, the mPFS were 2.7, 4.0, and 4.2 months, the ORR was 20%, 22%, and 20%, the mOS was 18.2, 25.5, and 24.7 months, respectively [50].

Nivolumab in ovarian cancer

A Phase II trial was to determine the safety and antitumor activity of nivolumab in patients with platinum-resistant ovarian cancer [24,51]. The efficacy population consisted of 20 patients treated with an intravenous infusion of nivolumab at a dose of 1.0 or 3.0 mg/kg every 2 weeks [51]. The mPFS was 3.5 months, and the mOS was 20.0 months [51].

Phase III

Nivolumab in lung cancer

In Brahmer et al open-label, randomized, international, phase 3 trial, 272 patients received nivolumab intravenously as monotherapy (3 mg/kg every 2 weeks) or docetaxel (75 mg/m² every 3 weeks) [52]. The mOS was 9.2 months with nivolumab versus 6.0 months with docetaxel, the mPFS of the nivolumab group was 3.5 months versus 2.8 months of the docetaxel group [52,53].

Nivolumab in melanoma

Recently, the results of three international, randomized Phase III studies of nivolumab were conducted [54,55,56]. The first Phase III trial (CheckMate 066) compared nivolumab with dacarbazine in 418 previously untreated patients who had metastatic melanoma without a BRAF mutation [23,54]. The OS rate was obviously higher in patients treated with nivolumab as compared with dacarbazine [54]. In the second reported phase III nivolumab trial, Weber et al enrolled 631 patients with advanced melanoma who progressed after anti-CTLA-4 treatment, randomly allocating 272 patients given nivolumab and 133 given investigator's choice of chemotherapy (ICC) [55,57]. The ORR was 31.7% in the nivolumab group, and 10.6% in the ICC group [55]. The third Phase III trial (CheckMate 067), nivolumab alone or nivolumab plus ipilimumab was compared with ipilimumab alone in 945 previously untreated patients with unresectable stage III or IV melanoma [56]. The mPFS of nivolumab plus ipilimumab, ipilimumab and nivolumab was 11.5 months, 2.9 months, and 7.0 months, respectively [56].

Nivolumab in RCC

In the phase III by Motzer et al, 821 patients with advanced RCC were randomly allocated to either nivolumab or everolimus [58]. The mOS was 25.0 months with nivolumab compared with 19.6 months with everolimus. The mPFS was 4.6 months with nivolumab and 4.4 months with everolimus [58,59].

Safety assessment and durable effect

The safety profile of nivolumab treatment is generally well tolerated. However, AEs also occurred, the most common AEs were fatigue, decreased appetite, diarrhea, nausea, cough, dyspnea, constipation, vomiting, rash, pyrexia, and headache. Common treatment-related AEs included fatigue, rash, diarrhea, pruritus, decreased appetite, and nausea [15]. The frequently occurring AEs with a potential immunologic cause were similar to the frequency observed in the clinical trials [54]. Immune-related AEs (irAEs) were of special interest because of the presumed mechanism of action of anti-PD-1 and prior experience with anti-CTLA-4 [14]. Select irAEs cause occurred most frequently in the skin, gastrointestinal, endocrine, and hepatic organ categories [49]. Additionally, nivolumab's toxicities are different than those observed with traditional chemotherapy [28], nivolumab treatment is associated with irAEs that can often be managed with corticosteroids in many cases [28]. Drug-related AEs of special interest included pneumonitis, vitiligo, colitis, hepatitis, hypophysitis, and thyroiditis [15]. Pneumonitis is a serious AE and is of major concern in lung cancer patients [30], and mild-to-moderate pneumonitis was managed successfully with either observation or glucocorticoids [15]. Hepatic or gastrointestinal AEs were managed with treatment interruption and the administration of glucocorticoids, moreover, these AEs could be reversible [15]. Endocrine disorders were treated with replacement therapy [15]. Based on indirect and direct comparisons in the patient population, grade 3 or 4 toxicities appear to be less common with nivolumab than with cytotoxic chemotherapy [28].

Conclusion and Future Directions

On the basis of these observations, nivolumab is a promising PD-1 inhibitor for targeted immunotherapy in the treatment of NSCLC, melanoma, RCC and other cancers. In addition, the clinical trials showed that nivolumab prolonged PFS, increased response rates, and is an effective and safe alternative for patients. Furthermore, nivolumab or plus nivolumab was superior to standard chemotherapy in patients with tumor. These results suggest that nivolumab has the potential as identifying predictive biomarkers for appropriate therapeutic therapy and drug development.

Acknowledgements

This work was supported by the National Nature Science Foundation of the People's Republic of China (numbers 81370673), and the Key Medical Projects of Jiangsu Province (numbers BL2014078), and Key Discipline of Jiangsu Province (2011- 2015).

Conflict of interest

The authors report no conflicts of interest in this work.

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Author contact

Corresponding author: Baoan Chen. Department of Hematology and Oncology (Key Department of Jiangsu Medicine), The Affiliated Zhongda Hospital, Medical School of Southeast University, Dingjiaqiao 87, Gulou District, Nanjing 210009, Jiangsu Province, People's Republic of China. Tel +86 25 8327 2006 Fax +86 25 8327 2011 Email cba8888com.

Received 2016-8-9
Accepted 2016-10-13
Published 2017-2-10

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