Spotlight on dinutuximab in the treatment of high-risk neuroblastoma: development and place in therapy
Authors Keyel ME, Reynolds CP
Received 22 August 2018
Accepted for publication 26 October 2018
Published 21 December 2018 Volume 2019:13 Pages 1—12
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Doris Benbrook
Michelle E Keyel,1,2 C Patrick Reynolds1–4
1Cancer Center, 2Department of Pediatrics, 3Department of Internal Medicine, 4Department of Cell Biology & Biochemistry, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, USA
Abstract: Neuroblastoma (NB) is a pediatric cancer of the sympathetic nervous system which accounts for 8% of childhood cancers. Most NBs express high levels of the disialoganglioside GD2. Several antibodies have been developed to target GD2 on NB, including the human/mouse chimeric antibody ch14.18, known as dinutuximab. Dinutuximab used in combination with granulocyte–macrophage colony-stimulating factor, interleukin-2, and isotretinoin (13-cis-retinoic acid) has a US Food and Drug Administration (FDA)-registered indication for treating high-risk NB patients who achieved at least a partial response to prior first-line multi-agent, multimodality therapy. The FDA registration resulted from a prospective randomized trial assessing the benefit of adding dinutuximab + cytokines to post-myeloablative maintenance therapy for high-risk NB. Dinutuximab has also shown promising antitumor activity when combined with temozolomide and irinotecan in treating NB progressive disease. Clinical activity of dinutuximab and other GD2-targeted therapies relies on the presence of the GD2 antigen on NB cells. Some NBs have been reported as GD2 low or negative, and such tumor cells could be nonresponsive to anti-GD2 therapy. As dinutuximab relies on complement and effector cells to mediate NB killing, factors affecting those components of patient response may also decrease dinutuximab effectiveness. This review summarizes the development of GD2 antibody-targeted therapy, the use of dinutuximab in both up-front and salvage therapy for high-risk NB, and the potential mechanisms of resistance to dinutuximab.
Keywords: neuroblastoma, GD2, immunotherapy, monoclonal antibody
NB is a malignant sympathetic nervous system tumor which accounts for 8% of childhood cancers.1 High-risk NB, defined primarily by age, stage, and MYCN oncogene amplification, poses a major therapeutic challenge.2 For high-risk NB, aggressive multi-agent therapy, myeloablative consolidation, followed by maintenance therapy with high-dose, pulse isotretinoin (13-cis-retinoic acid; 13-cis-RA) to treat minimal residual disease, improved event-free survival (EFS) if utilized before progressive disease.3,4 A further improvement in overall survival (OS) was seen with addition to maintenance therapy of the anti-GD2 antibody ch14.18 + cytokines.5 The latter study led to the Food and Drug Administration (FDA) granting a registered indication for the ch14.18 antibody (dinutuximab) when used as maintenance therapy for high-risk NB together with cytokines and 13-cis-RA after myeloablative therapy. A recent Children’s Oncology Group (COG) randomized trial demonstrated a high response rate in NB patients with progressive disease for temozolomide (TMZ) + irinotecan (IRN) combined with dinutuximab.6
Anti-GD2 immunotherapy for NB has been previously reviewed.7–9 In this article, we review the development of dinutuximab and other antibodies targeting GD2, the widespread clinical use of dinutuximab as part of maintenance therapy for high-risk NB, and the emerging use of dinutuximab as a component of chemoimmunotherapy for treating NB patients with disease progression. We also briefly review recent studies addressing mechanisms of NB resistance to therapy with dinutuximab and novel alternative immunotherapy approaches for NB that are in preclinical and clinical development.
NBs contain large amounts of gangliosides, and the disialoganglioside GD2 is highly expressed in most NBs and is also expressed in other cancers including melanoma and osteogenic sarcoma.7 GD2 is synthesized10 starting with the conjugation of serine and palmitoyl-CoA into 3-ketosphinganine, which is reduced to sphinganine. Ceramide synthases convert sphinganine to dihydroceramide, which is reduced to ceramide, and is glycosylated to glucosylceramide and then to lactosylceramide. Lactosylceramide is converted to GM3 by GM3 synthase, GM3 to GD3 by GD3 synthase, and GM2/GD2 synthase generates GD2 from GD3. Figure 1 illustrates the synthesis and metabolism of GD2.
Antibodies to GD2
Because of the strong expression of GD2 on NB, clinical grade antibodies were developed by multiple investigators. The different anti-GD2 antibodies and their key properties are listed in Table 1. Promising activity in early-phase clinical trials was seen with both a murine anti-GD2 antibody (3F8)11,12 and a chimeric anti-GD2 antibody (ch14.18),10 with the latter being used for the COG pivotal trial of ch14.18 + cytokines + 13-cis-RA after myeloablative therapy.5 Humanized anti-GD2 antibodies13 and a humanized anti-GD2/interleukin-2 (IL-2) fusion protein12,13 have also been studied in early-phase clinical trials. In the USA, ch14.18 (dinutuximab) has a registered indication for maintenance therapy of high-risk NB,14 and a biosimilar antibody produced in CHO cells (and thus with differing glycosylation) has European Medicines Agency (EMA) approval for NB maintenance therapy in Europe.15,16 GD2 monoclonal antibodies have also been used for the detection and purging of NB cells in bone marrow and in peripheral blood stem cells.3,17,18
Table 1 Anti-GD2 antibodies
Abbreviations: ADCC, antibody-dependent cellular cytotoxicity; EBV, Epstein-Barr Virus; EMA, European Medicines Agency; FDA, Food and Drug Administration; NB, neuroblastoma.
Clinical trials with anti-GD2 antibodies and regulatory approvals
Clinical trials of anti-GD2 antibodies have been conducted employing the antibodies as single agents or in combination with other chemotherapeutics or cytokines. It was apparent in the initial early-phase studies that the activity of anti-GD2 antibodies against NB tumor masses was limited. Thus, most of the early clinical trials focused on using the antibody as a component of maintenance therapy to eliminate MRD remaining after cytoreductive therapy with traditional cytotoxic chemotherapy and radiation. The murine anti-GD2 antibody 3F8 was used alone in NB patients19 or with granulocyte–macrophage colony-stimulating factor (GM-CSF) to stimulate myeloid effector cells in mounting an antibody-dependent cellular cytotoxicity (ADCC) attack on the tumor cells.20,21 In one Phase I study, the use of 3F8 alone induced major antitumor responses in four out of 17 patients with either melanoma or NB, with two of the responders being NB patients.19 When GM-CSF was combined with 3F8 in a Phase II NB trial, promising antitumor results were seen in patients with MRD in bone marrow.21 In a combined analysis of a series of nonrandomized single-arm trials for high-risk NB patients (NCI-V90-0023, NCT00002634, NCT00002560, NCT00072358), the best apparent outcome resulted from combining 3F8 with subcutaneous GM-CSF and 13-cis-RA.22 The murine anti-GD2 antibody (ch14.G2a) was combined with intravenous IL-2 in a Phase I/IB trial (CCG-0901) and showed a partial response in one NB patient out of 33 patients with GD2-positive malignances and a decrease in NB cells in the bone marrow of three patients.23
Humanization of anti-GD2 antibodies was undertaken to diminish the development of human anti-mouse antibodies (HAMAs) which can potentially block antitumor activity of anti-GD2 antibodies. The first such antibody was not totally humanized but is the chimeric 14.18 (ch14.18) which was developed from 14.G2a. Clinical trials (A0935A, ANBL0931, CCG-0935) of ch14.18 combined with GM-CSF, IL-2, and 13-cis-CA demonstrated the combination to be well tolerated and showed promising results.24–27 The COG undertook a large prospective randomized trial (ANBL0032) to determine whether adding ch14.18 combined with GM-CSF and IL-2 to maintenance therapy with 13-cis-RA (given after the completion of induction chemotherapy and myeloablative chemotherapy) was superior to maintenance with 13-cis-RA alone.5 The COG randomized trial demonstrated a significant improvement in both EFS and OS for patients randomized to receive ch14.18 + GM-CSF + IL-2 (intravenous)+13-cis-RA compared to maintenance therapy with 13-cis-RA alone.5 Monitoring of that randomized trial (blinded to investigators) revealed that the stopping rule for the demonstration of effectiveness had been achieved prior to completion of planned enrollment; therefore, the study was converted to a nonrandomized study where all patients received maintenance with ch14.18 + cytokines + 13-cis-RA. To obtain additional data on safety and toxicity required by the FDA for the registration of ch14.18, a nonrandomized Phase III study (ANBL0931) of ch14.18 + GM-CSF + IL-2 +13-cis-RA was carried out, which demonstrated safety, toxicity, and outcome data comparable to that observed in the ANBL0032 study.25 United Therapeutics Corporation, Silver Spring, MD, USA obtained a license from the National Cancer Institute for ch14.18, established production of the antibody, and secured from the FDA, a registered indication for the use of ch14.18 (now called dinutuximab) in combination with GM-CSF + IL-2 + 13-cis-RA for maintenance therapy of high-risk NB.
A biosimilar version of the chimeric ch14.18 antibody known as ch14.18/CHO and also as dinutuximab beta was developed by European investigators to be produced in CHO cells; this latter antibody having an altered glycosylation pattern compared to ch14.18 produced in SP2/0 cells.7,15,28,29 ch14.18/CHO was found to have similar pharmacokinetics to ch14.18 and showed a partial response in two out of seven patients with residual disease.15 Although not a randomized study, maintenance with ch14.18/CHO + IL-2 + 13-cis-RA (without GM-CSF) showed a significantly better outcome for patients receiving ch14.18/CHO + IL-2 + 13-cis-RA compared to historical controls before immunotherapy.30 A study (EudraCT number 2005-001267-63) showed that ch14.18/CHO was also found to be effective at stimulating effector responses throughout the treatment period when used as a continual long-term infusion with subcutaneous IL-2.31 The long-term infusion of dinutuximab beta resulted in reduced pain.32,33 Dinutuximab beta (ch14.18/CHO) has an approved indication in the European Union (EU) for treating high-risk NB patients at 12 months and greater who have received at least a partial response to induction chemotherapy and have received myeloablative chemotherapy.34,35 Dinutuximab, combined with IL-2, has an EMA-registered indication for the treatment of NB patients with relapsed or refractory disease who have not achieved a complete response to the first-line therapy after disease is stabilized.35
Relative contributions of multi-agent NB maintenance therapy
As the COG ANBL0032 randomized Phase III clinical trial employed ch14.18 together with GM-CSF and IL-2 and interspersed with 13-cis-RA, the relative contribution of the various components of maintenance therapy could not be determined from that trial. Although only randomized trials testing the various components (which are likely not feasible) can truly define relative contributions, some studies provide data that support the value of all components of therapy used for maintenance as used in the ANBL0032 study. For example, a nonrandomized study of ch14.18 given as a single agent without cytokines or 13-cis-RA in 334 metastatic NB patients (Cooperative German NB trials NB90 and NB97) did not show a significant improvement in patient outcome compared to maintenance cytotoxic chemotherapy.36 As described earlier, comparisons of studies using the murine anti-GD2 antibody 3F8 alone and with GM-CSF showed a better outcome for patients treated with 3F8 combined with GM-CSF.22 Pharmacokinetic analyses of 13-cis-RA for 524 patients treated on ANBL0032 with ch14.18 + cytokines + 13-cis-RA showed a lower OS for patients aged >18 months at diagnosis who achieved low exposures of 13-cis-RA and its active metabolite, suggesting an independent contribution of 13-cis-RA to maintenance therapy with ch14.18 + cytokines.37
Alterations of anti-GD2 antibodies to decrease systemic toxicity
A major toxicity of anti-GD2 antibody infusions is neuropathic pain, which is thought to be a result of complement activation at GD2-expressing nerve fibers.38 Humanized anti-GD2 antibodies have shown some reduction in pain, with hu3F8 resulting in less apparent pain than murine 3F8.39 For hu14.18, a point mutation to reduce complement activation was made to create hu14.18K322A.38 In a Phase I study (NCT0074349) in recurrent or refractory NB, hu14.18K322A treatment resulted in four out of 31 complete responses and two out of 31 partial responses, but pain was still a common side effect.40 A pilot study (NCT01576692) in recurrent/refractory NB with hu14.18K322A combined with GM-CSF and subcutaneous IL-2 resulted in a 61.5% response rate, with four complete responses and four partial responses.13 Thus, the elimination of complement binding may maintain anti-GD2 activity and diminish neuropathic pain, but whether or not antitumor activity at the level obtained with dinutuximab remains can only be determined in a randomized clinical trial.
Immunocytokines are created by fusing a cytokine to an antibody. IL-2 was fused directly to ch14.18 to make a GD2-specific immunocytokine, and IL-15 was directly fused to the anti-GD2 antibody c.60C3.41–44 The direct association of the cytokine with the antibody was hypothesized to be more effective by concentrating the cytokine to the tumor cells.7 In mouse models, the immunocytokine of ch14.18–IL-2 was shown to have superior antitumor activity compared to ch14.18 or IL-2 separately.9,45–47 In human studies, hu14.18 was used to create an IL-2 immunocytokine in an effort to avoid human anti-chimeric antibodies (HACAs).48 However, initial Phase I studies (NCT00003750) did not show any objective clinical responses with hu14.18-IL-2.49 In a Phase II study (NCT00082758) using hu14.18-IL-2, five patients out of 23 had complete repsonses.48,50 In these clinical trials, hu14.18-IL-2 was well tolerated and demonstrated activity against recurrent NBs, but whether the immunocytokine offers advantages over dinutuximab combined with cytokines remains unclear.7,50
Use of dinutuximab to treat progressive NB
To address the potential for dinutuximab to enhance salvage chemotherapy of recurrent NB, a COG “pick-the-winner” randomized trial was carried out testing the addition of two novel agents (dinutuximab + GM-CSF vs temsirolimus) to TMZ + IRN (commonly used for re-induction chemotherapy of NB). That Phase II study showed a higher response rate in the arm of the trial where patients received TMZ + IRN + dinutuximab and has led to an increasingly frequent use of the latter combination for treating recurrent NB. TMZ + IRN + dinutuximab + GM-CSF, achieved 10 partial responses and 11 complete responses for an overall 53% objective response rate (ANBL1221); with the study of additional patients, the objective response rate was ~40%.6,51 Future COG Phase II studies are planned that will build on the combination of TMZ + IRN + dinutuximab. In spite of the exciting clinical activity of TMZ + IRN + dinutuximab, more than half of all patients treated with that regimen did not show an objective response. There is currently no means for identifying patients who will not respond to TMZ + IRN + dinutuximab. A Phase I trial (NCT01711554) combining ch14.18 with lenalidomide and 13-cis-RA showed promising initial results, suggesting that immune cell activators other than cytokines may be effective in combination with dinutuximab, but whether such approaches are more effective (or as effective and better tolerated) than antibody + cytokines remains to be determined.52
Potential mechanisms of resistance to dinutuximab: differing immune effector cells
Progressive disease during or after therapy with dinutuximab reflects either inadequate exposure of tumor cells to the antibody, the inability of the patient’s immune effectors (myeloid cells, natural killer [NK] cells, complement) to combine with the antibody to kill tumor cells, or resistance of NB cells to antibody therapy. Mechanisms of resistance to anti-GD2 antibody therapy are not well defined. Most efforts in understanding the mechanisms of treatment failure of dinutuximab when used to treat MRD have focused on studying effector cells involved in ADCC.15,16,19–21 Studies seeking to improve therapy have largely focused on improving the delivery of cytokines (such as with an immunocytokine)22 or using approaches to enhance the activity of effector cells.53,54
The anti-cancer activity of dinutuximab relies on parterning with components of the patient’s immune response mechanisms that are listed in Table 2. One key player in the antitumor response of dinutuximab is NK cells. These cells are capable of killing antibody-bound NB cells via ADCC. The importance of NK cells in NB treatment has been widely reported.55–60 However, the low expression of NK cell-activating ligands, such as Major histocompatibility complex (MHC) class I related chain A, can compromise the ability of NK cells to target NB.59,61,62 Furthermore, TGFβ1 in the tumor microenvironment can inhibit NK cell cytotoxicity, which can be restored by treatment with the TGFβR1 inhibitor galunisertib.53 The addition of cytokines to activate NK cells or other immune cells in the tumor microenvironment is one way to stimulate ADCC in antibody-treated tumors. The addition of GM-CSF and IL-2 to anti-GD2 therapy enhanced ADCC against NB.5,22,23,50,63–66 GM-CSF increases the activation of myeloid cells, which are also important in antibody-mediated antitumor responses.22,66–68
Another complicating factor in the NK cell-mediated antitumor response is the repertoire of killer cell immunoglobulin-like receptors (KIRs) and KIR ligands expressed in NB patients. The balance between activating and inhibitory KIR signals influences NK cell activation. NK cells that have mismatched KIR/KIR ligands have been reported as playing a key role in 3F8 and hu14.18-IL-2-mediated anti-NB responses.22,59,66,69,70 COG investigators examined KIR and KIR ligand genotypes in patients in the ANBL0032 Phase III trial randomized to dinutuximab, IL-2, GM-CSF, and isotretinoin vs patients randomized to only isotretinoin. The immunotherapy group had a significantly better outcome than those randomized to only isotretinoin for the patients with all KIR ligands detected. However, if the patients had the KIR ligand missing genotype, no improvement in outcome was seen for those randomized to immunotherapy.71 Similarly, patients randomized to immunotherapy had a better outcome than isotretinoin alone depending on their KIR2DL2/KIR ligand status.71 In a subsequent study, the presence of NKp4+, KIR+, and KLRB1+ in pretreatment NK cells correlated with increased EFS and OS in patients treated with dinutuximab, GM-CSF, IL-2, and isotretinoin.72 Thus, it is possible that patients with certain immune effector cell genotypes may not benefit from antibody therapy, but further studies are needed to determine whether such genotypes are a robust way of identifying patients who do not benefit from anti-GD2 antibody therapy.
FC gamma receptors (FCGRs) on effector cells are necessary to attach antibodies and to mediate ADCC activity. In addition to KIR ligand mismatch, FCGR3A and FCGR2A polymorphisms have been associated with better outcome in antibody-treated NB patients.68,73 FCGR3A is predominantly on NK cells.68,74 FCGR2A is primarily expressed on macrophages, neutrophils, and monocytes, suggesting a role for enhanced phagocyte-mediated ADCC in 3F8 and ch14.18/CHO-treated NB cells.68,73 Furthermore, Siebert et al68 also found that ch14.18/CHO-treated patients with FCGR2A and FCGR3A polymorphisms and the activating KIR 2DS2 had the best antitumor activity.
As reflected in the data with FCGR2A polymorphisms, NK cells are not the only effector cells that are responsible for antitumor responses in antibody-treated tumors (Table 2). Macrophages and neutrophils are also capable of ADCC. Tumor-associated macrophages (TAMs) have been identified in NB tumors and have generally been associated with poor prognosis.75–78 However, macrophages are also able to phagocytose NB tumors and participate in an antitumor response.67,79,80 Macrophage polarization, and subsequent response to NB, relies in part on the cytokines and other factors in the tumor microenvironment. Neutrophil-mediated ADCC against NB has previously been reported.81,82 Furthermore, neutrophil-mediated antitumor responses in vitro were found to be associated with GD2 expression on NB cell lines treated with dinutuximab.83 Treatment with chemotherapy followed by dinutuximab also enhanced neutrophil-mediated cytotoxicity.83
A third cell type that induces tumor cell death is γδ T cells. These cells have been expanded and used to treat NB.84,85 A lineage of γδ T cells, Vγ9Vδ2cells, was shown to have cytotoxic activity against NB cells treated with ch14.18 in vitro.86 An in vivo mouse study demonstrated that administered γδ T cells in combination with dinutuximab and TMZ resulted in tumor regression.87
Potential mechanisms of resistance to dinutuximab: antibodies to the antibody
Treating NB patients with antibody therapy can lead to the development of antidrug antibodies (ADAs). For murine antibodies, such as 3F8, HAMAs have been reported in patients. The presence of HAMA not only led to faster clearance of antibodies but also was associated with better OS in 3F8-treated patients.22,88–90 Patients treated with ch14.18/CHO have generated HACAs. The development of HACA was associated with lower levels of therapeutic antibody detected and lower levels of ADCC and complement-dependent cytotoxicity (CDC).31 However, the serum from NB patients treated with ch14.18/CHO who developed HACA still had measurable CDC at the first treatment cycle and subsequent cycles.91 The frequency of HACA in patients treated with ch14.18/CHO (21%) was similar to those treated with dinutuximab.31,92 In patients treated with humanized anti-GD2 antibodies, about 40% developed human antihuman antibodies (HAHAs) to hu14.18K322A, while 21% of patients were reported to develop an HAHA response to hu3F8.40,93 Similar to what was seen in ch14.18/CHO, HAHA in hu3F8 was associated with lower serum levels of antibody in NB patients.93 The effect of ADA on patient response in anti-GD2 antibody therapy is still not fully understood and requires further investigation. Furthermore, the generation of an anti-idiotype response to GD2 antibodies may actually enhance antitumor activity, although further investigation is also needed in this area.91,94
Potential mechanisms of resistance to dinutuximab: low GD2 expression
Prior data in the literature show that most NBs at diagnosis express GD2 and GD2 negativity in tumors recurring after GD2 therapy was thought to be infrequent.89 However, a recently published study by Schumacher-Kuckelkorn et al95 in Germany demonstrated that low GD2-expressing NBs do occur, perhaps in as high as 12% of patients. The number of patients who had been treated with GD2 antibody therapy was not clear, and prior anti-GD2 therapy could increase the proportion of GD2-low patients.95 In a study of NB patients treated with ch14.18, five out of 15 patients experienced treatment failure and also had significantly lower GD2 expression than the patients without relapse.96 These results show the association of a low percentage of GD2-positive cells prior to treatment corresponded to relapse in patients treated with ch14.18.96 A recent study by COG investigators also demonstrated low dinutuximab binding to NB cell lines and patient-derived xenografts (PDXs), using multicolor flow cytometry in patient blood and bone marrow samples.97 Thus, low or negative GD2 expression may account for some treatment failures in NB patients treated with dinutuximab (Figure 2). Importantly, these latter data suggest that not all patients with progressive NB will have tumor cells expressing high amounts of GD2 and such patients may experience toxicity without benefit from dinutuximab in salvage regimens. It is possible that patients who benefit from dinutuximab are those with a high density and/or a high percentage of cells that are GD2 positive. However, there exist no nonclinical or clinical data defining the levels of GD2 expression that are needed to trigger antitumor responses. The selective pressure of dinutuximab therapy may result in decreased GD2 expression, which has been observed with targeting CD20 on lymphoma with rituximab,98–101 targeting CD19 on leukemia with CAR T cells,102 and with antibodies to EGF in breast cancer.103
NB antibodies against antigens other than GD2
A number of different monoclonal antibodies that recognize cell surface antigens on NB have been described. HSAN1.2, 459, and 390 are antibodies specific to NB but not bone marrow and were used for the purging of NB from bone marrow.3,17,18,104–107 KP-NAC8 is a monoclonal antibody specific to the cell surface of NB cells.108 B7-H3 (CD276) is found on the NB cell surface and can be targeted with antibodies, including enoblituzumab (MGA271) and 8H9.109–117 More recently, GPC2 has been identified as a potential target for drug antibody conjugates on the surface of NB cells.118–120 Because of the potential for resistance to dinutuximab resulting from decreased GD2 expression, such antibodies have potential for treating recurrent NBs and for eventually being combined with dinutuximab for initial therapy.
Targeting GD2 with non-antibody approaches
The success in acute lymphoblastic leukemia with chimeric antigen receptor T cells (CART) against CD19121–123 has led to a number of investigators developing CART targeting GD2.124–128 While some activity has been observed in NB clinical trials with GD2-CART, activity data that would support CART being tested in large randomized trials have not yet been achieved.
With the goal of providing a long-term immunological attack against NB, investigators have developed vaccine approaches with various antigens, including GD2. While there are potential advantages to a vaccine approach or to the use of CART in treating NB, a major drawback is that the vast majority of high-risk NB patients in the USA and EU receive dinutuximab maintenance therapy as part of up-front therapy. If, as indicated by some data, resistance to NB involves a decreased expression of GD2, then both GD2 vaccine and CART approaches will not be effective against tumor cells escaping primary therapy.
Monoclonal antibodies to GD2, murine, chimeric, and humanized have all shown activity. The clinical data suggested that optimal use of antibody therapy as maintenance therapy to eliminate MRD remaining after maximal cytotoxic therapy, which required randomized clinical trials to prove effectiveness of adding anti-GD2 therapy to standard-of-care approaches. A Phase III randomized trial of dinutuximab conclusively demonstrated that adding dinutuximab + GM-CSF + IL-2 to maintenance therapy with 13-cis-RA significantly improved outcome.5 Results with other anti-GD2 antibodies, although not tested in a randomized fashion, are similar. Regulatory approval has been achieved for dinutuximab in the USA and the EU and for the biosimilar ch14.18/CHO (dinutuximab beta) antibody in the EU.
The use of cytokines with dinutuximab has been developed to enhance the innate immune response, which is especially important in previously treated NB patients whose adaptive immune system has been inhibited.7 It is still an area of ongoing research to determine which immune effector cells are responsible for the antitumor responses with dinutuximab. NK cells, complement, and macrophages have been associated with enhanced antitumor activity through ADCC, CDC, and other mechanisms in antibody-treated NB.7,59,129,130 Neutrophils have also been reported to play a role in being responsible for killing tumor cells treated with dinutuximab, especially in combination with chemotherapy.81,83
Success with dinutuximab in maintenance therapy for patients in first response led to exploring the combination of dinutuximab with chemotherapeutic agents. Data from a study treating patients with progressive disease with the combination of TMZ + IRN + dinutuximab + GM-CSF showed a very promising response rate,6,51 and recent nonclinical data demonstrated a significant contribution of dinutuximab to the combination of TMZ + IRN + dinutuximab in NB PDXs.97 Dinutuximab has been shown to be more efficient for targeting NB cells in bone marrow rather than solid tumor mass disease,7,39 which may impact which patients achieve response when treating overt progressive disease. As low GD2-expressing NBs do not show a response to dinutuximab in PDX models,97 testing patients for tumor cell GD2 expression, together with other biomarkers, such as KIR mismatch, may identify patients likely not to benefit from dinutuximab therapy.
Because of the success in combining dinutuximab with cytotoxic chemotherapy in the relapse setting, ongoing and planned studies seek to incorporate dinutuximab into induction chemotherapy for NB.131 Although this may enhance the effectiveness of induction chemotherapy, such an approach has the potential to provide additional selection pressure against GD2 expression and may enhance the frequency of low GD2-expressing tumor cells, which could diminish the effectiveness of maintenance therapy and of treating patients with progressive disease with anti-GD2 antibodies. Thus, if the use of dinutuximab occurs in all phases of therapy for high-risk NB, it will be increasingly important to assess GD2 expression in tumor cells as part of clinical trials and potentially in the future as a guide to therapy. For patients with low GD2-expressing tumors, the use of therapeutic antibodies against non-GD2 antigens, such as B7-H3, offers the potential for activity in the setting of progressive disease and eventually for use in multi-antibody combination therapy approaches.109–111
Dr Michelle E Keyel reports grants from United Therapeutics, during the conduct of the study; Dr C Patrick Reynolds reports grants and non-financial support from United Therapeutics, during the conduct of the study. The authors report no other conflicts of interest in this work.
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