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Since the risk for autoimmunity was appreciated alongside the strong potential benefitof
the combined inhibition of LAG-3 and PD-1, the IND-enabling toxicology program for relat-
limab was designed to understand potential additive/synergistic adverse effects of the com-
bination therapy. In a 4-week repeat-dose toxicity study, cynomolgus monkeys were dosed
intravenously with five weekly doses of relatlimab at 30 or 100 mg/kg, nivolumab at
50 mg/kg, or a combination of relatlimab and nivolumab at 100 and 50 mg/kg, respectively,
followed by a 6-week recovery period ( Thudium et al., 2022). Both monotherapies were well
tolerated by monkeys with no adverse findings up to the highest administered doses, and a
NOAEL for relatlimab monotherapy was considered to be 100 mg/kg (NOAEL). However,
combination treatment of relatlimab and nivolumab was associated with higher incidence
and severity of inflammation in the central nervous system (choroid plexus, vasculature of
the brain paranchyma, meninges and spinal cord) as well as male reproductive tract (epidid-
ymis, seminal vesicles and testes), and resulted in the moribundity of one male monkey. The
histopathologic findings in the combination group were considered likely a result of
enhanced immunostimulatory effects resulting in loss of tolerance to self-antigens upon pro-
longed inhibition of both LAG-3 and PD-1 (Thudium et al., 2022; EMA Assessment Report:
Opdualag).
Pharmacodynamic endpoints in the 4-week repeat-dose toxicity study included an assess-
ment of TDAR (IgM, IgG and IgA) and ex vivo recall responses to intramuscularly adminis-
tered KLH, and immunophenotyping analyses of peripheral blood and splenic T-lymphocyte
subsets. The most prominent and noteworthy PD responses were noted in ex vivo T cell recall
assays upon restimulation with KLH, which indicated increased antigen -specific cytokine re-
sponses (CD69
þ
TNFa
þ
,CD69
þ
IFNg
þ
, CD69
þ
TNFa
þ
IFNg
þ
) in splenic CD4
þ
T cells in all
treated groups with a trend toward higher responses in the combination therapy group as
compared with monotherapy groups. These observed changes in ex vivo recall responses
tended to wane with declining exposures during the recovery phase (Thudium et al.,
2022). There were no changes in TDAR to KLH and no substantial changes in total T, B or
NK cell numbers in immunophenotyping. Minor changes in T cells subsets (e.g., CD4
þ
reg-
ulatory and CD25
þ
FoxP3
þ
CD8
þ
T cells) in the monotherapy and/or combination therapy
groups were considered related to high expression of the targets (i.e., LAG-3 and PD-1) on
regulatory T cells (EMA Assessment Report: Opdualag).
To support longer-term dos ing in the clinic and filing, a 3-month repeat-dose toxicity study
was conducted in sexually mature (4e7 year old) monkeys dosed intravenously with weekly
doses of relatlimab at 30 or 100 mg/kg followed by a 10-week recovery period (Thudium
et al., 2022 ). This study also included various assessments of PD (TDAR, immunophenotyp-
ing, and ex vivo recall responses). Consistent with the findings in the 4-week st udy, relatli-
mab was well tolerated with no adverse findings up to the highest administered dose level
of 100 mg/kg (NOAEL) (Thudium et al., 2022). In addition, there were no relatlimab-
related findings in reproductive organs (EMA Assessment Report: Opdualag).
No stand-alone safety pharmacology studies were conducted with relatlimab alone or in
combination with nivolumab. Safety pharmacology assessments, including clinical evalua-
tions of cardiovascular, respiratory, and neurologic fun ction, were included in repeat-dose
general toxicology studies. There were no effects on safety pharmacology parameters when
relatlimab was administered as a single agent or in combination with nivolumab in either
the 4-week or the 3-month repeat-dose toxicity studies (EMA Assessment Report: Opdualag).
11. Biological therapies for cancer386
III. Specialty biologics and indications
Since both LAG-3 and PD-1 are expressed on the surface of immune cells, an in vitro cyto-
kine release assay was conducted with relatlimab alone and in combination with nivolumab
in human PBMCs. Relatlimab, tested across a wide range of concentrations, did not induce
cytokine release in human PBMCs either alone or in combination with nivolumab (EMA
Assessment Report: Opdualag).
A tissue cross-reactivity study was conducted with labeled relatlimab to confirm LAG-3
expression in immune cells and assess any unexpected tissue binding using a select panel
of normal human tissues by IHC. Relatlimab showed strong positive staining in lymphocytes
as expected and consistent with previ ously published observations (Workman et al., 2002).
Unexpectedly, rare to occasional moderate/strong immunoreactivity was demonstrated
only in the adenohypophysis of the pituitary, which was further confirmed to be localized
to pituitary gonadotroph cells. Function of LAG-3 in the pituitary is unknown, but there
were no reported findings within the toxicity studies in monkeys suggestive of any adverse
effects on the pituitary or hypophyseal-portal system.
No carcinogenicity, genotoxicity or DART studies were conducted with relatlimab
(Opdualag Product Insert; EMA Assessment Report: Opdualag). The potential for LAG-3 in-
hibition to result in embryo-fetal effects was investigated using two murine surrogate anti-
LAG-3 antibodies in syngeneic and allogeneic mouse pregnancy models (Thompson et al.,
2019). The allogen eic mouse pregnancy model has been described as an alternative, relevant
model for assessing pharmacology-mediated reproductive liabilities of cancer immuno-
therapy mo lecules (Prell et al., 2016). However, treatment with murine anti-LAG -3 antibodies
did not result in any maternal or embryo-fetal development effects in either syngeneic or allo-
geneic crosses. Regardless, since Opdualag is a combination immunotherapy containing both
relatlimab and nivolumab, DART findings with nivolumab alone are applicable for the com-
bination. In a cynomolgus monkey ePPND study, administration of nivolumab from the
onset of organogenesis through delivery was associated with non-dose-related increase in
abortion and premature infant death, particularly in the third trimester (FDA Pharmacology
Review: Nivolumab; Opdualag Product Insert). Moreover, the function of the PD-1/PD-L1
axis in the maintenance of maternal-fetal immune tolerance (see PD-1 blockade and DART,
above) is well established (Zhang et al., 2015; Zeng et al., 2020; Guleria et al., 2005; Li et
al., 2021b). Therefore, the Opdualag labe l carries a warning that it may cause fetal harm
when administered to pregnant women, and women of reproductive potential are advised
to use effective contraception during treatment and for at least 5 months after the last admin-
istered dose (Opdualag Product Insert).
Recombinant analogs of endogenous human proteins (interferons, cytokines,
enzymes)
Interferons (IFN s) are types of cytokines that occur naturally in the body. While there are
three major types of IFNs: IFN alpha, IFN beta, and IFN gamma, IFN alpha is the type most
widely used in cancer treatment (Boyle, 2010). Researchers have found that IFNs can
improve the way a cancer p atient’ s immune system acts against cancer cells. In addition,
IFNs may act directly on cancer cells by slowing their growth or promoting their develop-
ment into cells with more normal behavior (Aguilar Rebolledo, 2000). IFNs may also
Recombinant analogs of endogenous human proteins (interferons, cytokines, enzymes) 387
III. Specialty biologics and indications
stimulate NK cells, T cells, and macrophages, boosting the immune system’santicancer
function. One issue with IFNs and other types of recombinant proteins is that ADAs that
develop to the recombinant product can cross-react to the respective endogenous proteins
and cause irreversible problems down the road such as chronic depletion of the endogenous
proteins and potential autoimmune phenomena, as the ADAs will persist in circulation long
after drug therap y has been ceased. This needs to be carefully monitored clinically and
cannot be predicted by animal species since human proteins are foreign to animals and
thus, depending on the species, animals are likely to develop some kind of ADA response
to human proteins.
Roferon-A
Roferon-A is a recombinant form of human IFN alpha for the treatment of certain types of
cancer, including hairy cell leukemia, melanoma, chro nic myeloid leukemia, and AIDS-
related Kaposi’s sarcoma (Trown et al., 1986). Studies have shown that IFN alpha may
also be effective in treating other cancers such as kidney cancer and non-Hodgkin’s lym-
phoma. The mechanism by which Roferon-A or any other IFN exerts antitumor or antiviral
activity is not clearly understood. However, it is believed that direct antiproliferative action
against tumor cells, inhibition of virus replication and modulation of the host immune
response play important roles in antitumor and antiviral activity (Roferon-A Prescribing In-
formation, 2024).
The biologic activity of IFNs that led to their discovery was their ability to protect cells
from infection with a variety of RNA and DNA viruses (Soetens, 2004; Isaacs, 1957). The anti-
viral activity of Roferon-A was compared in vitro with that of leukocyte IFN against a num-
ber of viruses. It was demonstrated that the relative antiviral activity of IFN alfa-2a was not
appreciably different from that of natural leukocyte IFN (i.e., it is representative of the
mixture of subtypes produced by leukocytes) (Kramer et al., 1983). The antiviral activity of
Roferon-A was then compared with that of leukocyte IFN in cell lines from a num ber of an-
imal species and was shown to be considerably species-restricted. Roferon-A was active in
human cells as well as cells from bovines, African green monkeys, and guinea pigs, but inac-
tive in cells from mice, hamsters, and rabbits (Soetens, 2004; Weck et al., 1981; Stebbing et al.,
1983; Soike, 1983; Kern et al., 1983). As a consequence, preclinical evaluation of Roferon-A has
involved in vitro experiments with human cells and in vivo studies in nude mice and rhesus
monkeys. Because of its species-restricted activity, it has not been possible to demonstrate
antitumor activity in immunologically intact syngeneic tumor model systems, where effects
on the host immune system would be observable. However, such antitumor activity has
been demonstrated with mouse interferon alfa in transplantab le mouse tumor systems. The
clinical significance of these findings is unknown. Roferon-A has been shown to inhibit the
growth of several human tumors growing in immunocompromised (nude) mice (Soetens,
2004).
The development of Roferon-A as a medicine commenced in the early days of biotech-
nology product development in the late 1970s and early 1980s. The toxicologic evaluation
of interferon alfa-2a presented unique problems not seen with typical small-molecule drugs.
One early problem was that despite the use of recombinant DNA techniques, highly purified
IFN alfa-2a was in short supply. It was not possible to design studies at high multiples over
11. Biological therapies for cancer388
III. Specialty biologics and indications
the expected human dose. At the time, clinical trials with Roferon-A began, however, there
was already considerable clinical experience with leukocyte interferon to inform on the na-
ture of the adverse effects that might be expected (Soetens, 2004).
Therefore, to support clinical dosing, single-dose studies were conducted in mice, rats, rab-
bits, and ferrets at doses up to 500 10
6
units/kg using various routes of administration (IV,
IM, and SC) and local tolerance was assessed in mice (IV), rats (IV), and rabbits (IM) (Mertes
and Laxenaire, 2002). The purpose of these studies was to confirm that there was no unex-
pected acute toxicity when clinical dosage forms were given to a variety of animals by
various routes. Therefore, these assessments were as much safety evaluations of the excipi-
ents contained in the clinical formulation as they were safety studies of Roferon-A itself, espe-
cially given that mice and rabbits are not relevant species based on in vitro cell-activation
data. The animals were given single doses and observed for 14 days. No mortality, local intol-
erance, or clinical signs related to treatment with Roferon-A were observed in these studies.
Subchronic toxicity studies with Roferon-A were conducted in mice (2 weeks), squirrel mon-
keys (4 weeks), rhesus monkeys (5 weeks), and cynomolgus monkeys (13 weeks) (Soetens,
2004). In mice, except for reversible, dose-related increases in platelet and certain leukocyte
count parameters, no effects related to Roferon-A treatment were observed. The squirrel
monkey was chosen because Roferon-A had been reported to have antiviral efficacy in that
species. Only one dose level of 2.5 10
6
units/kg per day was used because of limited sup-
ply, and only slight decreases in hemoglobin and hematocrit levels were observed. Roferon-A
was tested at doses up to 25 10
6
units/kg per day in DART dose range finding studies us-
ing rhesus monkeys (Soetens, 2004). The only treatment-related finding was dose-d ependent
anorexia, with associated weight loss. In the cynomolgus monkey study, there were no
treatment-related adverse findings at doses up to 10 10
6
units/kg per day except for tran-
sient anorexia, which occurred during the first 5 weeks and then disappeared with continued
treatment. Antibodies to Roferon-A developed in all studies and further complicated the
interpretation of these toxicology studies. In summary, these toxicology studies were not
considered very predictive due to the very low frequency of treatment-related adverse find-
ings, in contrast with the high frequency of side-effects subsequently observed in clinical tri-
als. As noted ab ove, this may have been a result of species-restricted activity and/or high
frequency of ADAs. Toxicology studies might be more predictive if homologous alpha-
interferons had been used in each species studied (Soetens, 2004).
Data in the literature concerning the genotoxicity of human leukocyte interferon are mixed
[94]. A chromosomal defect was observed following the addition of human leukocyte inter-
feron to lymphocyte cultures from a patient suffering from a lymphoproliferative disorder. In
contrast, other studies have failed to detect chromosomal abnormalities following treatment
of lymphocyte cultures from healthy volunteers with human leukocyte interferon. It has also
been shown that human leukocyte interferon actually protects primary chick embryo fibro-
blasts from chromosomal aberrations produced by gamma rays. However, no evidence of
mutagenicity was observed in Ames tests using six different tester strains, with and without
metabolic activation, up to a concentration of 1920 mg/plate. Furthermore, no increase in the
incidence of chromosomal damage was noted when human lymphocyte cultures were
treated in vitro with Roferon-A at noncytotoxic concentrations. Roferon-A was not been
tested for its carcinogenic potential, consistent with ICH guidance ( Mertes and Laxenaire,
2002; Yoshizawa et al., 2005).
Recombinant analogs of endogenous human proteins (interferons, cytokines, enzymes) 389
III. Specialty biologics and indications
Since Roferon-A was intended for use in women of childbearing potential without life-
threatening disease, reproductive toxicology studies were carried out in the rhesus monkey
(Soetens, 2004; Mertes and Laxenaire, 2002). Nonpregnant female monkeys were given daily
IM doses of 1, 5, or 25 10
6
units/kg for three consecutive men strual cycles. At the higher
doses of five and 25 10
6
units/kg per day, the menstrual cycles and cyclic serum hormone
levels were disrupted, which manifested as prolonged or shortened menstrual periods and
erratic bleeding; these cycles were considered to be anovulatory on the basis that reduced
progesterone levels were noted and that expected increases in preovulatory estrogen and
luteinizing hormones were not observed. These monkeys returned to a normal menstrual
rhythm following discontinuation of treatment. When pregnant female rhesus monkeys
were treated with the same doses of Roferon-A (approximately 20e 500 times the human
weekly dose, when scaled by body surface area) during the early to midfetal period of organ-
ogenesis from weeks 3e10 of gestation, a dose-dependent increase in the incidence of abor-
tions occurred. Abortifacient activity was also observed in two out of six pregnant rhesus
monkeys treated with 25 10
6
units/kg per day Roferon-A (500 times the human dose) dur-
ing the period of late fetal development (days 79e100 of gestation). No teratogenic effects
were seen in either study (Mertes and Laxenaire, 2002). Since the validity of extrapolating
doses used in animal studies to human doses is not established for Roferon-A, it is to be
used during pregnancy only if the potential benefit to the woman justifies the potential
risk to the fetus and only when they are using effective contraception during therapy. In addi-
tion, the injectable solution contains benzyl alcohol, which can be transmitted via the
placenta. Therefore, if Roferon-A is administered during pregnancy, the possibility of toxicity
to the developing fetus should be carefully assessed (Mertes and Laxenaire, 2002).
Summary
Increased understanding of the biology of cancer has allowed for the identification of novel
molecular targets for drug development. The high selectivity and affinity for the intended
target and decreased toxicity compared with traditional chemotherapies has translated to bio-
logic drugs being poised as critical players in the treatment of various cancers. With an ever-
increasing number of biologics in development, there are now more hopes of achieving
greater antitumor efficacy by combining biologic therapeutics with chemotherapy, radio-
therapy, and/or other biologics. However, the high costs, prolonged timelines and lack of
predictive nonclinical models continue to pose challenges for the development of new
oncology drugs. Moreover, oncology therapeutics are also less likely to reach the market
than those in other clinical fields despite high levels of investment. Nonclinical testing stra-
tegies for biologics have to be adapted and refined from experience with small molecules,
and should contribute to reducing the high attrition rates in drug development by being as
predictive as possible of clinical efficacy. Well-designed nonclinical development plans
with innovative study designs shorten the time to the delivery of safer therapeutics, and
should be considered an integral step for success of new biologic drugs.
The develop ment of biologic drugs comes with its own share of challenges. Since the
toxicity of most biologics is related to the mechanism of action, a thorough understanding
of the pharmacological target(s) is the critical first step in their nonclinical development.
11. Biological therapies for cancer390
III. Specialty biologics and indications
Second, species appropriateness for nonclinical studies based on target expression, cross-
reactivity, pharmacokinetics, etc., should be given due consideration. In general, the nonclin-
ical development of oncology biologics entails standard toxicology studies in two species
(rodent and nonrodent). However, depending on cross-reactivity, the use of a single pharma-
cologically relevant NHP species can be justified. Studies in human cells and transgenic mice
and the use of homologs or surrogate equivalents in rodents may also be necessary, and can
contribute to the safety assessment of the clinical candidate. Additional specialty toxicology
assessments should be conducted in alignment with the ICH guidances if warranted based on
a specific concern relative to the pharmacology of the given biologic. Immunotoxicological
evaluations may especially be warranted since a considerable number of biologic therapeutics
in development for oncology indications are intended to stimulate or suppress the immune
system. In addition, since human biologics are inherently immunogenic in nonclinical test
species, a thorough assessment of the immunogenicity profile is vital for the establishment
of the drug’s safety profile, as well as PK and PD interpretations. Finally, specific assays to
measure PD responses may need to be designed and incorporated into nonclinical studies
as markers of both safety and in vivo efficacy.
As has been illustrated in the above secti ons, the nonclinical development of oncology bio-
logic therapeutics is custom tailored with a particular focus on pharmacologic (i.e., target-
mediated) toxicities. Well-designed nonclinical studies aid in clinical dose selection and
regimen, and contribute significantly to the clinical safety monitoring plan. The type, timing
and flexibility called for in designing nonclinical studies for oncology biologics often differ
from other types of pharmaceuticals. Therefore, the ICH S9, S6(R1), and M3 guidances should
be used in combination to craft a comprehensive nonclinical development plan on a case-
specific basis. While the aforementioned ICH guidances provide the overall requirements,
the approach to nonclinical study design, conduct and endpoints to be included must be
driven by scientific rationale. As has been emphasized throughout the chapter, consultation
with Health Authorities regarding the sufficiency of nonclinical data packages to support
FIH, late stage clinical, and marketing phase of development are strongly encouraged.
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