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Review

Trial Watch: Immunostimulation with recombinant cytokines for cancer therapy

Elena García-MartínezHematology and Oncology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
,
Melody SmithDepartment of Medicine and Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY
,
Aitziber BuquéDepartment of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA
,
Fernando ArandaImmunoreceptors of the Innate and Adaptive System, IDIBAPS, Barcelona, Spain
,
Francisco Ayala de la PeñaHematology and Oncology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
,
Alejandra IvarsHematology and Oncology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
,
Manuel Sanchez CánovasHematology and Oncology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
,
Ma Angeles Vicente ConesaHematology and Oncology Department, Hospital Universitario Morales Meseguer, Murcia, Spain
,
Jitka FucikovaSotio, Prague, Czech Republic;Dept. of Immunology, 2nd Faculty of Medicine and University Hospital Motol, Charles University, Prague, Czech Republic
,
Radek SpisekSotio, Prague, Czech Republic;Dept. of Immunology, 2nd Faculty of Medicine and University Hospital Motol, Charles University, Prague, Czech Republic
,
Laurence ZitvogelGustave Roussy Comprehensive Cancer Institute, Villejuif, France;INSERM, U1015, Villejuif, France;Center of Clinical Investigations in Biotherapies of Cancer (CICBT) 1428, Villejuif, France;Université Paris Sud/Paris XI, Le Kremlin-Bicêtre, France
,
Guido KroemerUniversité Paris Descartes/Paris V, France;Université Pierre et Marie Curie/Paris VI, Paris;Equipe 11 labellisée Ligue contre le Cancer, Centre de Recherche des Cordeliers, Paris, France;INSERM, U1138, Paris, France;Metabolomics and Cell Biology Platforms, Gustave Roussy Comprehensive Cancer Institute, Villejuif, France;Karolinska Institute, Department of Women's and Children's Health, Karolinska University Hospital, Stockholm, Sweden;Pôle de Biologie, Hopitâl Européen George Pompidou, AP-HP, Paris, France
&
Lorenzo GalluzziDepartment of Radiation Oncology, Weill Cornell Medical College, New York, NY, USA;Université Paris Descartes/Paris V, France;Sandra and Edward Meyer Cancer Center, New York, NY, USACorrespondence[email protected]
 show all
Article: e1433982 | Received 24 Jan 2018, Accepted 24 Jan 2018, Published online: 15 Feb 2018

ABSTRACT

Cytokines regulate virtually aspects of innate and adaptive immunity, including the initiation, execution and extinction of tumor-targeting immune responses. Over the past three decades, the possibility of using recombinant cytokines as a means to elicit or boost clinically relevant anticancer immune responses has attracted considerable attention. However, only three cytokines have been approved so far by the US Food and Drug Administration and the European Medicines Agency for use in cancer patients, namely, recombinant interleukin (IL)-2 and two variants of recombinant interferon alpha 2 (IFN-α2a and IFN-α2b). Moreover, the use of these cytokines in the clinics is steadily decreasing, mostly as a consequence of: (1) the elevated pleiotropism of IL-2, IFN-α2a and IFN-α2b, resulting in multiple unwarranted effects; and (2) the development of highly effective immunostimulatory therapeutics, such as immune checkpoint blockers. Despite this and other obstacles, research in the field continues as alternative cytokines with restricted effects on specific cell populations are being evaluated. Here, we summarize research preclinical and clinical developments on the use of recombinant cytokines for immunostimulation in cancer patients.

Introduction

Cytokines are a large group of relatively small and generally (but not always) soluble glycoproteins that regulate virtually all biological functions as they elicit autocrine, paracrine or endocrine signaling pathways.Citation1-6 In particular, cytokines play a key role in (1) the development, maturation and localization of all cellular components of the immune system;Citation7-12 and (2) the initiation, execution and extinction of innate and adaptive immunity against invading pathogens as well as against malignant cells.Citation13-21 A detailed description of cytokines, their receptors and their biological activities goes largely beyond the scope of this Trial Watch, and can be found elsewhere.Citation3-6 For the purpose of the present discussion, however, it should be noted that the cytokine system is characterized by an extreme pleiotropism, and this has major implications for the development of cytokine-based therapeutics.Citation22-24

Over the past three decades considerable attention has indeed been attracted by the possibility of using recombinant cytokines as standalone interventions or in combination with other immunotherapeutics to trigger or boost, respectively, clinically relevant anticancer immune responses.Citation16,Citation19,Citation25,Citation26 However, only three different agents have been approved by the US Food and Drug Administration (FDA) and European Medicines Agency (EMA) so far for the treatment of malignant disorders in humans: recombinant interleukin (IL)-2 (aldesleukin, Proleukin®), and two variants of recombinant interferon alpha 2 (IFN-α2), namely, IFN-α2a (Roferon®-A) and IFN-α2b (Intron®-A). In particular: (1) recombinant IL-2 (generally given at high doses) is licensed for the treatment of some forms of metastatic melanoma and renal cell carcinoma (RCC); (2) recombinant IFN-α2a is approved for use in patients with hairy cell lymphoma and chronic phase, Philadelphia chromosome-positive chronic myelogenous leukemia (CML) upon minimal pretreatment (within 1 y from diagnosis); and (3) recombinant IFN-α2b is licensed for the treatment of AIDS-related Kaposi's sarcoma, melanoma, follicular lymphoma, multiple myeloma, hairy cell leukemia, genital warts (Condyloma acuminata) and cervical intraepithelial neoplasms (sources www.fda.gov and http://www.ema.europa.eu/ema/). Moreover, the use of these agents in the clinics is steadily declining, for at least two reasons. First, the elevated pleiotropism of the system implies that the systemic administration of one cytokine mediates a large number of biological activities, multiple of which may be unwarranted (including moderate-to-severe side effects) or even detrimental to clinical activity.Citation27-36 As a standalone example, it is now well know that high-dose IL-2 acts as a mitogen for CD8+ cytotoxic T lymphocytes (CTLs), which at least in part underlies its therapeutic activity in subjects with melanoma and RCC, but even more so for CD4+CD25+FOXP3+ regulatory T (TREG) cells, which de facto antagonize anticancer immune responses.Citation37-42 Second, multiple immunotherapeutics with comparatively more specific mechanisms of action and robust clinical activity have been developed, including (but not limited to) immune checkpoint blockers (ICBs).Citation43-48

Nonetheless, research on the use of recombinant cytokines as immunostimulants against cancer continues as attention has shifted (1) to molecules with restricted selectivity for one or a few cell types, such as IL12, IL-15 and IL-21Citation49-52; and (2) on regimens involving the concomitant or sequential administration of one or more recombinant cytokines with other agents that trigger or boost anticancer immunity,Citation53 including (but not limited to): ICBs,Citation54-56 immunostimulatory monoclonal antibodies (mAbs),Citation57-60 DNA-, dendritic cell (DC)- or peptide-based vaccines,Citation61-67 chemotherapy with immunogenic cell death inducers,Citation68-73 radiation therapy delivered according to specific fractionation protocols,Citation74-76 small molecules targeting the tumor microenvironment,Citation77-81 adoptively transferred T cells,Citation82-85 and oncolytic virotherapy.Citation86-88

Importantly, at least three other cytokines beyond IL-2, IFN-α2a and IFN-α2b are currently licensed by the US FDA and EMA for use in humans, namely, recombinant tumor necrosis factor (TNF), recombinant granulocyte monocyte colony-stimulating factor (GM-CSF, also known as Molgramostim, Sargramostim, Leukomax®, Mielogen® or Leukine®), and recombinant granulocyte colony-stimulating factor (G-CSF, also known as Filgrastim, Lenograstim or Neupogen®). However, in the current clinical practice these molecules are employed as oncolytic agents (TNF)Citation89-100 or immunoreconstituting drugs (GM-CSF, G-CSF).Citation101-108

Here, we discuss recent preclinical and clinical advances in the development of recombinant cytokines for use as immunostimulants (rather than oncotoxic and immunoreconstituting agents) in cancer patients.

Preclinical and translational advances

Since the publication of the latest Trial Watch dealing with this topic (December 2015),Citation24 a large amount of preclinical and translational work on the role of immunostimulatory cytokines in anticancer immune responses has been released (source https://www.ncbi.nlm.nih.gov/pubmed).

Of this abundant scientific literature, we retained the contribution of: (1) Benci and colleagues (from the University of Pennsylvania, Philadelphia, PA, USA), who demonstrated that chronic, low-intensity type I IFN signaling within the tumor microenvironment contributes to the establishment of a multigenic program of resistance to immune checkpoint blockadeCitation109,Citation110; (2) Vanpouille-Box and collaborators (from Weill Cornell Medical College, New York, NY, USA), MacKenzie and colleagues (from The University of Edinburgh, Edinburgh, UK) and Harding et al. (from the Abramson Family Cancer Research Institute, Philadelphia, PA, USA), who independently demonstrated that acute, high-intensity type I IFN signaling driven by cyclic GMP-AMP synthase (CGAS)Citation111-115 and transmembrane protein 173 (TMEM173; best known as STING)Citation116-119 activation following DNA damage (generally in the context of cellular senescence)Citation120-123 is paramount for the establishment of anticancer immune responses with systemic activityCitation124-129; (3) Gao and colleagues (from The University of Texas MD Anderson Cancer Center, Houston, TX, USA), Ayers and co-workers (from Merck & Co. Inc., Kenilworth, NJ, USA) and Overacre-Delgoffe et al. (from St. Jude Children's Research Hospital, Memphis, TN, USA), who provided robust data in support of the notion that an intact IFN-γ signaling pathway is required for malignant lesions to respond to ICB-based immunotherapyCitation130-133; (4) Ghasemi and collaborators (from Washington University, St. Louis, MO, USA), who demonstrated that selectively targeting IL-2 to natural killer cells expressing killer cell lectin like receptor K1 (KLRK1; best known as NKG2D)Citation134-137 results in superior tumor control upon as it does not engage TREG cellsCitation138,Citation139; (5) Zhang and colleagues (from Dana-Farber/Harvard Cancer Center, Boston, MA, USA), who showed that the biological activity of IL-1βCitation140-143 is positively modulated by physiological reactive oxygen species (ROS) levels upon cysteine-S-glutathionylationCitation144; and (6) Waghray and co-authors (from University of Michigan, Ann Arbor, MI. USA), who characterized a population of mesenchymal stem cellsCitation145-147 that supports pancreatic tumor progression by releasing GM-CSF.Citation148

Moreover, (1) Wagner et al. (from Washington University School of Medicine, St. Louis, MO, USA) demonstrated that the potent IL-15 receptor agonist ALT-80350,149-154 can be used in vivo to prime superior antitumor responses by NK cellsCitation155; (2) Mishra and collaborators (from The Ohio State University, Columbus, OH, USA) proved a critical role for dysregulated IL-15 signaling in the pathogenesis of cutaneous T-cell lymphomaCitation156; (3) Hu and coauthors (from the University of Pennsylvania, Philadelphia, PA, USA) showed that CAR T cells engineered to secrete IL-18 mediate superior therapeutic responses in mice with B16F10 melanomasCitation157-159 as compared to CAR T cells with a wild-type secretory capacityCitation160; (4) Seo and co-workers (from Seoul National University, Seoul, Republic of Korea) demonstrated that IL-21Citation161can be used to reverse NK cell exhaustion, at least mice, resulting in improved immunity against MHC Class I-deficient neoplasmsCitation162; (5) Chapuis et al. (from the Fred Hutchinson Cancer Research Center, Seattle, WA, USA) tested IL-21 primed CTLs transferred in combination with a CTLA4-targeting mAb to a single patient with metastatic melanoma refractory to either intervention alone, demonstrating robust tumor control,Citation163 mimicking preclinical results from independent investigators;Citation164 (6) Yin and collaborators (from Academia Sinica, Taipei, Taiwan) showed that the secretion of IL-25Citation165-167from cancer-associated fibroblastsCitation168-172 has direct oncosuppressive effects in preclinical models of breast carcinomaCitation173; and (7) Molgora et al. (from the Humanitas Clinical and Research Center, Rozzano, Italy) reported that interleukin 1 receptor accessory protein like 1 (IL1RAPL1; best known as IL-1R8), a member of the IL-1β receptor protein family,Citation174-178 operates as an inhibitory checkpoint in the maturation of and acquisition of effector functions by NK cells.Citation179

These and other emerging aspects of the cytokine biology have considerable implications for the immunotherapeutic management of cancer and a plethora of other conditions, including infectious and autoimmune disorders.

Completed clinical studies

Since December 2015, when the latest Trial Watch dealing with the use of recombinant cytokines as immunostimulants for cancer therapy was published,Citation24 the results of just a few clinical studies (directly or indirectly) testing this immunotherapeutic paradigms in cancer patients have been released (source http://www.ncbi.nlm.nih.gov/pubmed).

NCT01989572 was a Phase III clinical study evaluating yeast-derived GM-CSF versus peptide vaccination versus GM-CSF plus peptide vaccinationCitation180-183 versus placebo in 815 patients with locally advanced or Stage IV melanoma and no evidence of disease after complete surgical resection.Citation184 In this setting, HLA-A#02+ patients were randomly allocated to each of the study arm, while HLA-A#02− individuals were randomized to receive GM-CSF as a standalone intervention or placebo. No statistically significant differences in overall survival (OS) or relapse-free survival (RFS) were observed across the groups.Citation184 These findings are at odds with previous results from prospective Phase II and non-prospective Phase III studies suggesting that recombinant GM-CSF (alone or combined with other immunotherapeutics) provides a clinical benefit to patients with melanoma at high risk for recurrence.Citation185-191 Of note, it has recently been demonstrated that >90% of melanoma patients receiving adjuvant therapy with GM-CSF develop GM-CSF-targeting antibodies,Citation192-194 which in >40% of the cases are neutralizing.Citation195 This may explain, at least in part, the limited therapeutic efficacy of GM-CSF in some clinical settings.

Schijns and colleagues (from the University of Wageningen, The Netherlands) assessed the safety and therapeutic activity of a personalized cell-based cancer vaccine (Gliovac™) administered intradermally in the presence of recombinant GM-CSF to patients with recurrent, incompletely resected, treatment-resistant glioblastoma multiforme (GBM).Citation196-198 In this context, 9 GBM patients refractory to standard-of-care temozolomide-based chemotherapy,Citation199 radiation therapy, surgery or targeted therapy with bevacizumabCitation200,Citation201 received Gliovac plus recombinant GM-CSF following a TREG-depleting course of cyclophosphamide,Citation202 resulting in superior survival rates as compared to historical controls.Citation203-205 As the treatment was associated with limited toxicity, a Phase II study has been initiated to evaluate this immunotherapeutic approach in a larger cohort of GBM patients including bevacizumab-naïve individuals (NCT01903330). Along similar lines, Rampling and colleagues (from the Beatson West of Scotland Cancer Centre, Glasgow, UK) evaluated a peptide-based vaccine (IMA950)Citation206,Citation207 plus recombinant GM-CSF along with standard chemoradiotherapy and adjuvant temozolomide for the treatment of patients with newly-diagnosed GBM.Citation208 In the context of this Phase I clinical study, 45 HLA-A#02+ patients who had undergone tumor resection received 11 intradermal injection of IMA950 plus GM-CSF over 24 weeks, beginning either 7-14 day prior to the initiation of chemotherapy or 7 days after. Of 40 evaluable patients, 90% were immunological responders to at least one of the vaccine components, irrespective of therapeutic schedule, and progression-free survival (PFS) rates at 6 mo. and 9 mo. were 74% and 31%, respectively.Citation208 These findings are in line with previous results demonstrating that GM-CSF can be safely used as an immunostimulant in patients with GBM and other tumors who receive additional (immuno)therapeutic agents.Citation209-214

The safety and efficacy of IFN-α2a in combination with pembrolizumab, an FDA-approved, potent ICB targeting programmed cell death 1 (PDCD1; best known as PD-1),Citation215-218 was investigated in the context of the KEYNOTE-029 study (NCT02089685).Citation219 Data from the dose-finding cohort of the study indicate that the maximum tolerated dose is 2 mg/kg pembrolizumab every 3 week plus 1 μg/kg pegylated-IFN weekly, a regimen that demonstrated limited antitumor activity.Citation220 That said, previous findings demonstrated that recombinant IFN-α2a can be safely administrered in combination with: (1) bevacizumab and optionally tyrosine kinase inhibitors, for the treatment of metastatic RCCCitation221-228; (2) the FDA approved CD20-targeting agent rituximab,Citation229-231 for the treatment of lymphomaCitation232-235; as well as chemotherapy plus a mAb blocking the IL-6 receptor,Citation236-239 for the therapy of epithelial ovarian carcinoma.Citation240

Interestingly, biomarkers of response amongst patients with advanced RCC have been retrospectively evaluated on data from 12 distinct clinical trials, including NCT00631371, a Phase III study comparing bevacizumab plus recombinant IFN-α2a with bevacizumab plus the mechanistic target of rapamycin (MTOR) inhibitor temsirolimus,Citation241 which operates as an antiproliferative and autophagy-activating agent.Citation242-247 In this context, an early tumor shrinkage (eTS) above 10% was associated with improved PFS and OS, although the retrospective nature of the analysis constitutes a major limitation of the study.Citation241

At the occasion of the 2017 American Society for Clinical Oncology (ASCO) Annual Meeting, Diab and collaborators (from the University of Texas MD Anderson Cancer Center, Houston, TX, USA) reported preliminary findings from an ongoing Phase I-II study testing the safety and therapeutic profile of NKTR-214 (a CD122-biased agonist of the IL-2 system)Citation248-250 combined with nivolumab (another FDA-approved ICB directed against PD-1)Citation251-254 in patients with melanoma, non-small cell lung carcinoma (NSCLC), RCC, bladder carcinoma or triple-negative breast cancer (NCT02983045).Citation255 Amongst 5 patients treated with this regimen, no dose-limiting toxicities and no drug-related or immune-related Grade 3-5 adverse events (AEs) were documented. Moreover, one patient (with melanoma) experienced a mixed radiographic response associated with markers of immune activation, while another patient (also with melanoma) had an unconfirmed complete response per RECIST v. 1.1.Citation255

At the same occasion, Tarhini and colleagues (from the University of Pittsburgh Cancer Institute, Pittsburgh, PA, USA) reported the results of a randomized Phase II trial testing the FDA-approved CTLA4-targeting mAb ipilimumabCitation256-259 at two different doses, alone or in combination with high-dose recombinant IFN-α2b (NCT01708941).Citation260 At a median follow-up of 26.4 mo., AEs were consistent with the toxicity profiles of ipilimumab and high-dose IFN-α2b, including 3 treatment-related Grade 5 AEs: suicide, lung infection and hemorrhage, and adult respiratory distress syndrome. However, no significant differences in PFS or OS when evaluating ipilimumab-receiving patients versus individuals treated with the same dose of ipilimumab and high-dose IFN-α2b.Citation260

The clinical studies discussed here above focused on recombinant cytokines that are already approved for use in humans for anticancer therapy (IL-2, IFN-α2a) or immune reconstitution (GM-CSF). At least in part, this reflect the well-characterized safety profile of IL-2, IFN-α2a and GM-CSF. It will be interesting to see the final results of hitherto ongoing clinical trials testing the therapeutic profile relatively poorly investigated cytokines such as IL-12, IL-15 and IL-21 (see below).

Recently initiated clinical trials

Since the latest Trial Watch dealing with this topic was published,Citation24 no less than 44 clinical studies have been initiated to assess the therapeutic profile of recombinant cytokines employed as off-label immunostimulants (rather than oncotoxic and immunoreconstituting agents) in cancer patients (source http://www.clinicaltrials.gov). Of these studies, (1) nineteen involve recombinant GM-CSF (NCT02623595; NCT02636582; NCT02641782; NCT02663440; NCT02677155; NCT02703714; NCT02728102; NCT02774421; NCT02873819; NCT02946138; NCT02976740; NCT02978222; NCT03012100; NCT03014076; NCT03033303; NCT03189706; NCT03222089; NCT03282188; NCT03363373); (2) fourteen recombinant IFN-α (NCT02576964; NCT02627144; NCT02634294; NCT02737046; NCT02829775; NCT02838342; NCT02948426; NCT02982720; NCT03056599; NCT03066947; NCT03117816; NCT03121079; NCT03253250; NCT03328026); (3) four recombinant IL-2 (NCT02641782; NCT03040401; NCT03222089; NCT03224871); (4) four recombinant IL-12 (NCT02542124; NCT02544724; NCT02994953; NCT03030378); and (5) six additional cytokines including IL-15 (NCT02689453; NCT03388632), IFN-β (NCT02584829), IFN-γ (NCT02948426; NCT03112590), and fms related tyrosine kinase 3 ligand (FLT3LG)Citation261,Citation262 (NCT02839265) ().

Table 1. Recent clinical trials evaluating recombinant cytokines as immunostimulants in cancer patients.#

In particular, the safety and immunostimulatory activity of recombinant GM-CSF is being investigated: (1) in subjects with neuroblastoma receiving a ganglioside GD2-targeting mAb,Citation263-267 optionally in the context of multimodal chemotherapy (NCT02641782; NCT03033303; NCT03189706; NCT03363373); (2) in patients with breast cancer, who receive recombinant GM-CSF as an adjuvant to peptide-based vaccination (NCT02636582; NCT03012100; NCT03014076); and (3) in individuals with a panel of other tumors, including biliary cancer (NCT02703714), colorectal carcinoma (NCT03222089), ependymoma (NCT02774421), follicular lymphoma (NCT02677155), GBM (NCT02663440), head and neck cancer (NCT02873819), hepatocellular carcinoma (NCT02946138), lung cancer (NCT02976740; NCT02623595) melanoma (NCT03282188), multiple myeloma (NCT02728102) and ovarian carcinoma (NCT02978222) often in combination with standard-of-care therapy, radiation therapy, or experimental immunotherapy ().

The therapeutic profile of IFN-α2a is being assessed: (1) in patients with hepatitis B virus (HBV)-related hepatocellular carcinoma following tumor resection (NCT03253250); (2) in subjected with RCC concomitantly receiving bevacizumab-based therapy (NCT02627144); (3) in individuals with neuroendocrine tumors in the context of chemotherapy with metronomic cyclophosphamideCitation203,Citation268-271 (NCT02838342); and (4) in patients with advanced tumors previously responding to IFN-α2a, in the context of maintenance therapy (NCT02829775). The safety and preliminary efficacy of IFN-α2b are being assessed: (1) in patients with human T-cell lymphotropic virus type I (HTLV-I)-derived adult T-cell leukemia/lymphoma concomitantly receiving belinostat (an FDA-approved histone deacetylase inhibitor)Citation272,Citation273 and zidovudine (an antiretroviral agent)Citation274 (NCT02737046); (2) in women with breast cancer in the context of targeted immunotherapy plus metronomic cyclophosphamide (NCT03066947; NCT03328026); (3) in patients with hematological malignancies including CML, as a standalone immunotherapeutic intervention for maintenance purposes (NCT03117816; NCT02634294); (4) in individuals with cholangiocarcinoma receiving pembrolizumab (NCT02982720); (5) in subjects with hepatocellular carcinoma receiving capecitabine-based chemotherapyCitation275,Citation276 (NCT02576964); (6) in patients with soft tissue sarcoma receiving microdosed IFN-α2b together with multiple other therapeutic agents via a specific delivery device (NCT03056599); and (6) in women with gynecological tumors, as an intraperitoneal infusion combined with recombinant IFN-γCitation277,Citation278 and autologous monocytes (NCT02948426). Recombinant IFN-γ is also being tested in combination with multimodal chemotherapy in women with breast carcinoma (NCT03112590), while recombinant IFN-β is being investigated in combination with radiotherapy, the CD274-targeting mAb avelumabCitation279-283 and optionally adoptive cell transfer in patients with Merkel cell carcinoma (NCT02584829) ().

Recombinant IL-2 is being investigated: (1) in subjects with CML, as part of a maintenance protocol involving the co-administration of histamine dihydrochlorideCitation284 (NCT03040401); (2) in colorectal carcinoma patients receiving FOLFOXIRI-based chemotherapy (folinic acid plus 5-fluorouracil plus oxaliplatin plus irinotecan)Citation285,Citation286 and recombinant GM-CSF (NCT03222089); (3) in individuals with neuroblastoma receiving a ganglioside GD2-targeting mAb plus recombinant GM-CSF (NCT02641782); and (4) in subjects with NSCLC receiving radiation therapy plus ICB-based immunoth-erapyCitation287-289 (NCT03224871). The safety and therapeutic profile of recombinant IL-12 are being assessed: (1) in lymphoma patients, either in the context of salvage chemotherapyCitation290 (NCT02544724), or in combination with total skin electron beam therapyCitation291,Citation292 (NCT02542124); and (2) in subjects with advanced solid tumors, receiving ICB-based immunotherapy (NCT02994953; NCT03030378). Along similar lines, recombinant IL-15 is being investigated: (1) in combination with the CD52-targeting mAb alemtuzumabCitation293,Citation294 in adults with T-cell leukemia/lymphoma (NCT02689453); and (2) in combination with ipilimumab and/or nivolumab in patients with advanced solid neoplasms (NCT03388632). Finally, the therapeutic profile of recombinant FLT3LG combined with stereotactic body radiation therapy is being assessed in subjects with advanced or metastatic NSCLC (NCT02839265) ().

Of note, a large a majority of these studies are ongoing, with three notable exceptions: NCT02627144, NCT02829775 and NCT03014076 (). NCT02627144 was a non-interventional, multicenter trial to evaluate efficacy and safety of intravenous bevacizumab plus recombinant IFN-α2a for the first-line treatment of patients with advanced and/or metastatic RCC. The study enrolled a total of 365 individuals, of which 359 were allocated to treatment and 338 could be analyzed for clinical responses. Amongst these 338 subjects, 5.3% experienced a complete response, 21.9% a partial response, and 39.1% disease stabilization; median PFS and OS were 10.2 and 28.7 mo., respectively (source https://clinicaltrials.gov/ct2/show/results/NCT02627144). NCT02829775 was a Phase II/III study aimed at enabling patients with CML, melanoma or RCC who previously responded to recombinant IFN-α2a or pegylated IFN-α2a in the context of other clinical trials to continue therapy. Of nine patients enrolled in the study, only 5 completed the entire administration schedule (daily or weekly subcutaneous administration until disease progression, withdrawal, or death – up to approximately 3 y.), but all participants achieved a complete response, with a single case of severe AEs (lung infection in one patient) (source https://clinicaltrials.gov/ct2/show/results/NCT02829775). NCT03014076 was a Phase I study testing a peptide-based vaccine (GP2) adjuvanted with recombinant GM-CSF plus trastuzumab-based chemotherapy in clinically disease-free patients with breast cancer. Seventeen women were vaccinated, none of whom experienced dose-limiting or severe (Grade 3–5) toxicities.Citation295 As immunological reactivity was documented in a majority of subjects enrolled in the study, a Phase II trial was launched to evaluate efficacy.Citation296

Concluding remarks

The possibility to employ recombinant cytokines alone or in combination with other immunotherapeutics to elicit or boost, respectively, tumor-specific immune responses in cancer patients has been – and still is being – intensively investigated.Citation16,Citation19,Citation25 As discussed above, one of the major limitations encountered so far relates to the extraordinary pleiotropism of the system.Citation22-24 To circumvent (at least in part) this issue, increasing attention is being devoted to cytokines that naturally exhibit a relatively restricted cell specificity, such as IL-12, IL-15 or IL-21.Citation49,Citation50,Citation52,Citation297 Moreover, efforts are being dedicated at the development of highly targeted cytokine variants aimed at focusing the biological effects of cytokine signaling onto a rather specific cell population.Citation138,Citation298 Alongside, the panel of immunotherapeutic agents available for inclusion in combinatorial regimens has tremendously expanded over the past few years,Citation299-301 opening multiple new avenues of clinical investigation.

An interesting cytokine-related approach that is currently being developed in both preclinical and clinical settings involve the use of recombinant IL-4 as a vector to specifically deliver a modified version of exotoxin A from Pseudomonas aeruginosa to glioblastoma cells (which express the IL-4 receptor)Citation302-307 (NCT02858895). Considerable efforts are also being dedicated to the development of cytokine receptor agonists, such as ALT-803 (which operates as a superagonist of the IL-15 pathway).Citation50,Citation149-154 No less than twelve different clinical trials have been launched since December 2015 to investigate the safety and therapeutic profile of ALT-803 in multiple oncological indications (source http://www.clinicaltrials.gov).

Moreover, increasing attention is being received by the delivery of cytokine-coding genes, especially in the context of CAR T cell-based immunotherapyCitation308-312 as well as DC-based and cancer cell-based vaccination.Citation160,Citation313-316 As a matter of fact, the only immunotherapeutic based on myeloid cells currently approved for use in cancer patients, namely, sipuleucel-T (Provenge®), relies on the expression of a chimeric protein that encompasses acid phosphatase, prostate (ACPP; best known as PAP) and GM-CSF.Citation317,Citation318 However, the actual impact of Provenge® in the management of prostate cancer patients does not meet the expectations.Citation319 As it stands, it is difficult to predict which of the aforementioned approaches (if any) will open a clear path to the use of recombinant cytokines as immunostimulants in cancer patients. Additional work on specificity and safety issues is urgently awaited in this sense.

Acknowledgments

FA is supported by the Sara Borrell fellowship program (CD15/00016) from Instituto de Salud Carlos III. GK is supported by the Ligue contre le Cancer Comité de Charente-Maritime (équipe labelisée); Agence National de la Recherche (ANR) – Projets blancs; ANR under the frame of E-Rare-2, the ERA-Net for Research on Rare Diseases; Association pour la recherche sur le cancer (ARC); Cancéropôle Ile-de-France; Chancelerie des universités de Paris (Legs Poix), Fondation pour la Recherche Médicale (FRM); a donation by Elior; the European Commission (ArtForce); the European Research Council (ERC); Fondation Carrefour; Institut National du Cancer (INCa); Inserm (HTE); Institut Universitaire de France; LeDucq Foundation; the LabEx Immuno-Oncology; the RHU Torino Lumière; the Seerave Foundation; the SIRIC Stratified Oncology Cell DNA Repair and Tumor Immune Elimination (SOCRATE); the SIRIC Cancer Research and Personalized Medicine (CARPEM); and the Paris Alliance of Cancer Research Institutes (PACRI). LG is supported by an intramural startup from the Department of Radiation Oncology of Weill Cornell Medical College (New York, US), and by Sotio a.s. (Prague, Czech Republic).

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