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Advances in Dermatology and Allergology/Postępy Dermatologii i Alergologii
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Original paper
Patient characteristics of children with cow’s milk allergy presenting with an allergy to extensively hydrolyzed whey and/or casein formulae used as part of an elimination diet

Zygmunt Nowacki

Postep Derm Alergol 2012; XXIX, 6: 421-431
Online publish date: 2012/12/21
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Introduction

Allergic conditions are currently one of the key issues in contemporary medicine. Studies conducted in Europe have shown that allergic hypersensitivity to food is a significant clinical problem with increasing prevalence [1].

A food allergy is defined as an adverse immune res­ponse to ingested food. It is not a disease in the classic sense, but rather a pathological reaction affecting numerous organs and tissues, which may present as atopic dermatitis (AD), urticaria, angioedema, asthma, allergic rhinitis, anaphylactic reaction (AR), or various gastrointestinal symptoms (GI) [2-4].

It is currently believed that in Europe ca. 7% of all children before the age of 3 are afflicted with this type of disorder [5, 6].

Cow’s milk protein allergy (CMPA) is most frequently observed in infants and small children fed with modified milk or breast-fed children who are additionally bottle-fed with modified milk, and affects ca. 4-8% of children [7-9]. Ca. 0.5% of exclusively breast-fed children present with CMPA [10]. Hypersensitivity reactions to food may belong to any of the 4 types described by the Gell and Coombs classification. The most common response in people allergic to food is type I, immediate and IgE-mediated hypersensitivity reaction, which is responsible for

48-52% of the observed symptoms. Cytotoxic reactions (type II), reactions mediated by immune complexes (type III) and delayed-type hypersensitivity reactions (type IV) are observed for ca. 6%, 10% and 18% of patients, respectively. In as many as 28% of cases with food allergies there is more than one reaction type involved [11].

Cow’s milk protein allergy is a group of signs and symptoms that present after ingestion of foods containing CMP; it occurs mostly via IgE-mediated, non-IgE-mediated or mixed (IgE/non-IgE mediated) mechanisms [2, 12]. The signs and symptoms of CMPA are non-specific and vary considerably. The consumption of milk and milk products by individual patients may result in different clinical manifestations at different stages. Some of the reasons for these differences include the type of mechanism involved in the hypersensitivity reaction (immediate – IgE-mediated, delayed – non-IgE-mediated or mixed IgE/non-IgE mediated), as well as the reaction site [10, 13]. The severity of an allergic reaction depends on the site of the disease process (single organ or multiple organs), among other things, and its course may vary from child to child. Cow’s milk protein allergy most often manifests with cutaneous symptoms, while the next two most frequent manifestations are gastrointestinal symptoms (GI) and respiratory symptoms (RS). Its severity may be classified as mild, moderate or severe. Anaphylactic reaction and other forms and/or signs and symptoms are much less frequently observed [10].

A 2008 report by the Centers for Disease Control and Prevention (CDC) noted an 18% increase in the prevalence of food allergy between 1997 and 2007, emphasizing the observed increase in the frequency of AR in response to food consumption [14].

Bovine milk contains proteins that may induce allergic reactions. There are two main groups of bovine milk that are of clinical importance: casein proteins (Bos d8) and whey proteins (-lactalbumin – Bos d4, -lactoglobulin – Bos d5, bovine serum albumin – Bos d6, and bovine immunoglobulins – Bos d7). Bovine casein contains four types of proteins: s1, s2, , . Patients are often allergic to the - and -fractions of casein (100% and ca. 91.7%, respectively). Around 80% of patients with CMPA present with allergic reactions to bovine -lactalbumin [9]. According to medical standards making a proper diagnosis of food allergy requires a complex procedure. In addition to the medical history and the physical examination, the basic diagnostics include a number of tests carried out both in vitro and in vivo. Cow’s milk protein allergy is mostly IgE-mediated, hence both the determination of the concentration of allergen-specific IgE (asIgE) in blood serum and the skin prick and skin application food tests (SPT and SAFT, respectively) may be of significant assistance in making the diagnosis. While tests measuring the asIgE level in blood serum and/or tests such as the SPT are valuable from a diagnostic viewpoint, they are not sufficient to diagnose food allergy [15]. The medical history, the clinical manifestation, and the test results will ultimately indicate which foods should be evaluated in open challenge tests or single-blind/double-blind placebo-controlled food challenges (SBPCFC/DBPCFC), and also indicate whether the challenge tests should

be carried out on an inpatient basis and whether they should be postponed [10, 16].

A particular type of ingested food may be considered to be the sole cause of a condition only when its elimination from the diet causes the symptoms to disappear completely or relieves them to a considerable degree, while its reintroduction results in their recurrence. A successfully implemented elimination diet is an essential element of treatment. Therapeutic management of allergy is a consequence of its diagnostic and clinical complexity. The form of the elimination diet and its duration need to be adjusted to individual cases. Putting a patient on this type of diet should be justified by the medical interview, the clinical manifestation, and the results of tests and the specific food challenge tests performed (depending on the indications). Such an approach minimizes the associated risks. The ability to outgrow food allergies is related to the mechanism of hypersensitivity to food. Children with non-IgE-mediated allergy outgrow food allergies sooner than chil­dren with IgE-mediated allergies [10]. The elimination diet con­stitutes the causal treatment of CMPA. Extensively hy­drolyzed formulae (eHF) are recommended in the manage­ment of children fed with modified milk. In medical practi­ce the two types of hydrolyzed formulae that are applied most often are extensively hydrolyzed whey formulae (eHF-W) and extensively hydrolyzed casein formulae (eHF-C). In recent years the incidence of failed treatment due to allergy to eHF given as part of an elimination diet has been growing significantly, and so has the unsubstantiated prescription of elimination diets [17-20].

Aim

The aim of the study was to present patient characteristics of children with allergies to CMP who presented with allergies to eHF-W and/or eHF-C used as part of an elimination diet.

Material and methods

Material



The material for the study consisted of medical records of infants treated for CMPA. The analysis was retrospective in character. The initial group was selected from among 573 children diagnosed and treated at a Specialized Allergological Practice. Two hundred and fourteen children who had CMPA and were breast-fed or breast-fed and additionally given formulae containing eHF-W and eHF-C were excluded from further observations at the very outset. The final study group was selected via further exclusion of 294 children who were either successfully treated with the initially applied diet based on eHF-W or eHF-C or in whose case the observations of allergy to eHF were insufficient. A preliminary diagnosis of CMPA was made based on the medical history, the physical examination, the evaluation of signs and symptoms, and the identification of the food causing the reaction. The next diagnostic stage involved an elimination/challenge diagnostic diet and keeping a dietary record. Open challenge tests were performed after 3 to 8 weeks (depending on the initial symptoms) of the elimination/challenge diet. During these tests patients were given food (modified lactose-free milk) suspected of inducing the signs and symptoms in gradually increased doses. The recurrence of symptoms after repeated unintentional exposure to a food allergen was also considered a positive result of the challenge. The challenge tests were ordered to be carried out only under conditions in which anti-shock therapy was possible. The challenge test was not performed if the medical history indicated that food allergy may manifest as an anaphylactic reaction. The type of CMPA (i.e. IgE-mediated vs. non-IgE-mediated or IgE/non-IgE mediated) was diagnosed based on the clinical presentation over time and the results of asIgE tests. The clinical manifestation of CMPA and the family history of allergic conditions were established for all children. The final diagnosis was made when the correlation between the ingestion of a given food type and the presentation of signs and symptoms was confirmed.

A group of 65 children aged 3 to 12 months was selected for further analysis. The group included 25 females and 40 males. The basic inclusion criteria for the observations were the presentation of CMPA symptoms during the infant stage of children fed with modified milk and the occurrence of eHF-W allergy. Further observations were carried out for those children who were initially put on an eHF-W-based elimination diet (Bebilon Pepti – Nutricia) and who were then given eHF-C (Nutramigen – Mead Johnson Nutrition) due to the allergy-related failure of the initial treatment. The adverse finding – allergy – was made based on the medical history, the physical examination, and by applying the elimination diet for 4 weeks and then performing an open challenge test with the previously used eHF. Children who presented with an allergy to eHF-C received an amino acid formula (EleCare – Abbott Nutrition). All 65 children under observation had their total IgE (normal va-

lues of t-IgE for different age groups: before the age of 1: 0-29 IU/ml; 1-2 years old: 0-49 IU/ml; 2-3 years old: 0-45 IU/ml; 3-9 years old: 0-57 IU/ml; over the age of 9: 0-89 IU/ml) and their asIgE levels determined; the latter parameter was determined for -lactalbumin, -lactoglobulin, bovine casein, hen’s egg white, and wheat by means of the IMMULITE 2000 3g AllergyTM method (normal values expressed in kU/l: class 0: < 0.35; class 1: 0.35-0.69; class 2: 0.7-3.4; class 3: 3.5-17.4; class 4: 17.5-49.9; class 5: 50.00-100.00; class 6: > 100).

For further analysis the group of 65 children was divided into two subgroups:

I. Children with non-IgE-mediated CMPA (31 patients),

II. Children with IgE-mediated CMPA (34 patients).

Eight children with mixed (IgE/non-IgE mediated) CMPA were evaluated as part of the IgE-mediated group.



Methods



In the first group of children (non-IgE-mediated CMPA) the correlation between eHF-C tolerance (success = no allergic reaction; failure = allergic reaction) and other qualitative variables (gender, family history of allergic conditions, cutaneous, respiratory and gastrointestinal symptoms) was analyzed using Fisher’s exact test and the 2 test. In the second group (IgE-mediated CMPA) the correlation between eHF-C tolerance (success = no allergic reaction; failure = = allergic reaction) and other qualitative and quantitative variables was investigated using logistic regression (CI – con­fidence interval, OR – odds ratio). The levels of asIgE observed in the group tolerant to eHF-C and in the group presenting with eHF-C allergy were compared by means of the Mann-Whitney U test. Two comparisons of asIgE antibody levels were carried out. In the first comparison all children from the IgE-mediated CMPA group were considered and the differences between the food-specific antibody levels observed for children on the diet based on eHF-C (success = no allergic reaction to eHF-C) and for children on the AAF-based diet (failure = allergic reaction to eHF-C). The second comparison of asIgE levels excluded the children who had presented with an anaphylactic reaction (AR).

Statistical analysis

Statistical analyses were performed using the Statistica computer program (version 9.0).

Results

In the initial group of 359 children allergic reactions to eHF-W and eHF-C were observed in 18.1% (65/359) and 7.8% (28/359) of cases, respectively. Of the 65 children from

the main study group, 28 presented with an eHF-C allergy, which amounts to 43%. The proportions for the non-IgE-mediated CMPA and the IgE-mediated CMPA groups were 45% (14/31) and 41% (14/34), respectively. No allergic reactions to AAF and no AR in response to eHF were observed in patients from the study group (Table 1).

The clinical manifestation involved multiple organs in 62% of patients from the study group. No anaphylactic reactions to either eHF-C, eHF-W or AAF were observed.

However, anaphylactic reactions to CMP occurred in 26% of the patients (9/34) from the IgE-mediated CMPA group (Table 2).

Fisher’s exact test revealed that the efficacy of eHF-C in the first subgroup of patients (IgE-mediated CMPA) is not affected by such parameters as gender (p = 0.47), family history of allergic conditions (p = 0.27), occurrence of AD (p = 0.45) and respiratory symptoms (p = 0.58). The efficacy of eHF-C was, however, related to GI symptoms

(p = 0.001). All children in this group showing CMPA-related GI symptoms also presented with symptoms of eHF-C allergy, and, in addition, symptoms of AD.

Logistic regression was used to evaluate the dependence of eHF-C efficacy on other qualitative and quantitative variables in the second subgroup (IgE-mediated CMPA). This analysis yielded the following conclusions:

• The occurrence of CMPA-related GI symptoms is associated with a statistically significant increase in the probability of eHF-C allergy: p = 0.014, OR = 20.3, 95% CI: 3.9-105.6.

• TThe occurrence of an anaphylactic reaction is associa-ted with a statistically significant decrease in the pro-

bability of eHF-C allergy: p = 0.028, OR = 0.028, 95% CI: 0.002-0.396.

The probability and chance of failure (allergic reaction to eHF-C) and success (no allergic reaction to eHF-C) were calculated as part of further analysis based on the parameters of the logistic regression model.

The 11 patients who presented with CMPA-related GI symptoms and in whom no anaphylactic reaction occurred were allergic to eHF-C more often than the other children. The probability of an eHF-C allergy in this group was very high and equal to 0.82. The group with no GI symptoms and no anaphylactic reaction had a much lower probability of 0.28. It should also be emphasized that the group of 11 children (3 females and 8 males) at most risk (i.e. the patients with GI symptoms and no anaphylactic reaction) constitutes 32% of the second subgroup (34 patients).

In the course of subsequent analysis the t-IgE levels and the concentration of asIgE antibodies (allergens:

-lactoglobulin, casein, -lactalbumin, hen’s egg white) obser­ved for individual patients from the second subgroup with IgE-mediated CMPA were compared. These levels were compared twice for children with good tolerance to

eHF-C (success – no allergic reactions to eHF-C) and children receiving an AAF due to eHF-C allergy. The first comparison included all children from the IgE-mediated CMPA subgroup and analyzed the differences between antibody levels in children tolerant to eHF-C and in children who are allergic to it, i.e. children on the AAF-based diet. The second comparison of antibody levels excluded the children who had presented with an anaphylactic reaction.

The 25 children in the case of whom failure (eHF-C allergy) was observed had statistically significant higher t-IgE levels and higher concentrations of asIgE antibodies (allergens: -lactoglobulin, casein, -lactalbumin, hen’s egg white) than did children tolerant to the diet based on

eHF-C (Figure 1).

During further analysis the relevant parameters for those children from the IgE-mediated CMPA group who did not present with AR were compared. All asIgE results pertaining to bovine milk allergens (-lactoglobulin, casein, -lac­talbumin) and above normal range (i.e. asIgE values  0.7 kU/l) were analyzed for a group of 12 children with good tolerance to the diet based on eHF-C (success = no allergic reaction to eHF-C) and a group of 13 children who had been receiving AAF due to an eHF-C allergy. The levels of antibodies were compared twice, and the number of positive asIgE results ( 0.7 kU/l) for specific allergens was established for each child from both groups. The majority of the 13 children in the group with the AAF-based diet have above-normal concentrations of asIgE antibodies

( 0.7 kU/l = class 2) for either two or three bovine milk allergens (30.77% and 53.85% of patients, respectively). These children account for over 80% (53.85 +30.77%) of the AAF group. On the other hand, the majority of children in the eHF-C group had either a single asIgE result  0.7 kU/l (50.0%) for one bovine milk allergen or no positive results at all (41.67%). These children accounted for 90% of this group (41.67 +50.00%).

There is a correlation between the occurrence of eHF-C allergy and the number of values of asIgE for individual bovine milk allergens equal to or greater than 0.7 kU/l; this correlation was confirmed using the 2 test (p = 0.002). Two or three asIgE values above the normal range were more common among children allergic to eHF-C than among non-allergic children (Figure 2).

Discussion

The first accounts concerning allergy-related treatment failure when using elimination diets based on hydrolyzed soy formulae (HSF), eHF-W and eHF-C were reported in the 1980s and 1990s [21, 22].

In the group initially under observation, allergies to eHF-W and eHF-C were present in 18.1% (65/359) and 7.8% (28/359) of patients, respectively. The prevalence of these allergies in the present study is consistent with the value reported in the currently available literature, i.e. ca. 10% [23-25].

In the study by Kaczmarski et al. 67 cases of children with AD were investigated. Treatment failure – allergy to eHF – was observed in 32.8% (22/67) of patients. Of these 22 patients, 17 were allergic to eHF-C, 4 were allergic to eHF-W and one presented with an allergy to AAF [26]. A study by Finnish authors Klemola et al. reported an eHF-W incidence of 2.2% [27].

This type of allergy to eHF is likely a much more common phenomenon than believed so far. In clinical practice the first-line treatment of infants with CMPA-related cutaneous symptoms (AD) usually involves eHF. In some cases the prescription of an eHF-based diet results in a temporary improvement lasting several days, after which there is a relapse of the previously observed signs and symptoms. At this stage the most widely applied management of the condition involves intensifying the treatment of the cutaneous symptoms and waiting for the patient to outgrow the allergy. However, this approach (i.e. ignoring the cause-and-effect relationship between the type of ingested food and the signs and symptoms, and the continuation of an eHF-based diet) seems unreasonable. It is likely due to the lack of consensus on the treatment of AD between researchers specializing in pediatric allergology and dermatologists. Many authors have been highlighting this problem for a long time [28, 29].

The approach to management in the present study entailed the transition from eHF-W to eHF-C in those children who presented with an allergy to the former (failure of treatment). However, 43% of patients presented with eHF-C allergy after the transition, with similar incidence rates in the IgE-mediated and mixed CMPA group (41%) and the non-IgE-mediated CMPA group (45%). This approach is therefore very likely to fail regardless of the mechanism underlying the allergic reaction. The results of these observations cannot be directly compared to those obtained in any other study, since no studies that were similar in design (i.e. studies in which one unsuccessfully used eHF type was replaced with another type, e.g. eHF-W with eHF-C) were found. This approach to management, common in pediatric practice, was the result of the limited availability of AAF in Poland. Experts most often suggest that AAF should be applied in cases of allergies to any one of the extensively hydrolyzed formulae that are confirmed by elimination and challenge tests, and in cases of severe allergies affecting multiple organs and presenting with gastrointestinal symptoms (enteropathy, malabsorption) and AR [2, 17, 20].

In the observed group CMPA manifested most frequently as AD and GI symptoms (Table 1). The literature on the subject has been drawing attention to the change in clinical manifestation of CMPA for many years now. In a 1951 study Clein observed 140 infants. Cutaneous, gastrointestinal and respiratory symptoms of CMPA were present in 43%, 51% and 10% of individuals, respectively [30]. Gerrard et al., Hill et al., and Kaczmarski made similar observations in the 1960s, 1970s, and 1980s [31-33]. The studies carried out by these authors found GI symptoms to be the predominant manifestation of CMPA. On the other hand, recent reports confirm that the cutaneous manifestation is the most frequently observed manifestation of CMPA [5]. There are two possible explanations of this phenomenon. On the one hand, it might be a consequence of changes in feeding patterns and/or the level of the parents’ knowledge and/or the availability of tests that enable early diagnosis of allergy. On the other hand, it may mean that the gastrointestinal manifestation of CMPA is transforming and becoming asymptomatic like celiac disease, the latent/occult variant of which provides an illustration of this possibility [34]. That is why the clinical manifestation of CMPA is increasingly often analyzed in the context of the underlying immune mechanism. In their paper, Hill et al. reported that in their study 100 children (27%) developed a cutaneous manifestation in the form of urticaria and angioedema after 45 min. Fifty percent of children presented with emesis and diarrhea. After more than 20 h had elapsed AD was observed in 20% of subjects [35]. The proportion of children with a given clinical manifestation was thus clearly dependent on the type of hypersensitivity reaction (IgE-mediated, non-IgE-mediated or IgE/non-IgE mediated). It is therefore reasonable to suggest that all collective reports should contain additional information on the immune mechanism underlying CMPA for the patients included in the corresponding studies [10, 20].

The IgE-mediated mechanism was observed most often in the case of gastrointestinal or respiratory manifestation, while the non-IgE mechanism was associated with the cutaneous manifestation of CMPA. The relationship between the immune mechanism of hypersensitivity reactions and the clinical manifestation and family history of allergic conditions observed in the present study is similar to that reported in the literature [36-38].

In the IgE-mediated CMPA group (34 patients) an AR occurred in 26% of children (Table 2). In the literature this type of clinical manifestation of CMPA is estimated to occur in 4-15% of cases, with a noticeable upward trend [39, 40]. Eight of the children who presented with an AR to CMP were maintained on a diet based on eHF-C. This group was characterized by high average t-IgE and asIgE concentrations (Table 2). Many studies have evaluated the factors (gender, atopy, asIgE for particular foods) that may be used to predict the severity of the subsequent allergic reaction. The available literature has shown that higher concentrations of asIgE correlate with increased probability of an allergic reaction after food ingestion, but do not directly affect its severity. It should be emphasized that asIgE levels may be determined using different methods [41-43].

It has also been shown that people suffering from asthma are at a higher risk of developing an anaphylactic reaction and that the incidence of these reactions is the same for both sexes [44].

A study by Spanish authors Boyano-Martinez et al. evaluated the consequences of unintentional ingestion of CMP for children allergic to this allergen. Eighty-eight children participated in the study, and the observations lasted 12 months. Thirty-five children developed allergic reactions, and 15% presented with severe symptoms. The risk of presenting with severe symptoms was associated with a high concentration of asIgE and asthma [45].

A study by Celik-Bilgili et al. evaluated the level of asIgE in 501 children (average age of 13 months). All children had their specific IgE serum concentration determined and they were all subjected to food challenge tests. A correlation between the asIgE concentration and the positive result of oral challenges with CMP and chicken eggs was de­monstrated [46].

The literature features many reports that stress the fact that a high level of asIgE for casein and multiple organ manifestation of CMPA are both factors that increase the risk of developing an allergy to eHF [47, 48]. The observations made in the present study contradict those by other authors, since the analysis of the level of asIgE antibodies would suggest the opposite correlation. As can be seen in the presented diagrams (Figure 1), the children who developed anaphylactic reactions did not present with the clinical symptoms of eHF-C allergy, despite having very high levels of asIgE, but they were allergic to eHF-W. However, after the exclusion of children with AR and the subsequent comparison of asIgE levels, the observations were consistent with those by other authors. In the investigated group with IgE-mediated CMPA (25 children) patients who were allergic to eHF had statistically significant higher levels of t-IgE and asIgE antibodies (allergens: -lactoglobulin, casein, -lactalbumin, hen’s egg white, wheat) than patients who tolerated the diet based on eHF-C. This observation was consistent with the literature reports for this age group, provided the children with anaphylactic reactions were excluded [43, 44]. Without this exclusion, the asIgE levels for casein indicate the opposite correlation. Two or three results above the normal range, i.e. those that were equal to or greater than 0.7 kU/l (p = 0.02), were observed more often for children from the group with eHF-C allergy than for other children. In a study by Kaczmarski et al. it was observed that the results for -lactoglobulin, casein and -lactalbumin are positive (asIgE  0.7 kU/l) more often for children with multiple organ manifestation and AD than for allergic children with GI symptoms [49]. The following question arises: was the fact that children with CMPA who developed AR did not show the symptoms of allergy to

eHF-C merely a coincidence related to the small size of this group, or was it an indicator of the occurrence of AR in a group of children with different genetic and immunological characteristics? It might have been caused by the clinical variability associated with the age at which the diet was prescribed, and/or with biological and/or genetic variation in this group of patients. Fisher’s exact test revealed that in the group with non-IgE-mediated CMPA allergy to eHF-C was not dependent on variables such as gender, family history of allergic conditions, or cutaneous and respiratory symptoms. The factor associated with eHF allergy was CMPA-related gastrointestinal symptoms (p = 0.001). All children in this group with a GI manifestation of CMPA presented with an allergy to eHF, as well as AD. The literature dealing with this issue has been reporting multiple clinical manifestations in a single child for many years now [2]. Even though a similar group of protein allergens is the causal factor in every case of CMPA, the clinical response of a child’s body, i.e. the clinical manifestation, is different for each patient. The site affected by the allergic reaction and the underlying immune mechanism determine the severity of the process, and are always unique and variable with age [10].

Hill et al. evaluated the efficacy of AAF in a systematic review. They analyzed 20 investigations, in which eHF and/or AAF were used. In the case of children with the non-IgE-mediated form of allergy, in whom CMPA manifested with GI symptoms or AD, AAF were more effective than eHF [49].

Although medical knowledge is constantly being expanded, as of today we are still unable to predict with a high degree of certainty whether a given patient with CMPA will necessarily develop an allergy to eHF. There are no sufficiently reliable tests with the required specificity and sensitivity that would make it possible to unambiguously diagnose and/or predict this form of hypersensitivity. We still do not know whether the mechanism underlying the symptoms of eHF allergy is an IgE-mediated, non-IgE-mediated or mixed one, or whether children with the IgE-mediated CMPA, for example, develop an eHF allergy with the same underlying mechanism.

Even new diagnostic techniques do not provide the desired evidence in eHF food allergies, since asIgE antibodies may be undetectable in blood serum when their specificity is limited to epitopes undergoing modification or forming de novo during the processing of food and/or digestion and/or in the case of a cross-allergy to eHF.

Children may also react to residual allergens present in eHF [10]. Furthermore, most affected children may also possibly present with reactions to more than one allergen that is formed de novo in the GI tract. The widely applied commercial tests that determine the level of asIgE antibodies for -lactoglobulin, casein and -lactalbumin, however, may only be used to detect antibodies against the allergens present in the native food material, and not in the eHF. The IgE-mediated and non-IgE-mediated pathogenic mechanisms are often complex in practice. Assuming that the eHF allergy is a form of cross-allergy, the possibility that cross-hypersensitivity occurs mostly via the IgE-mediated mechanism should be considered. This phenomenon is determined mainly by the structure of the so-called major antigens, which are recognized by the immune system and stimulate the synthesis of specific IgE antibodies. A cross-reaction is highly probable, as the homology of protein sequences may be as high as 70%; for values lower than 50% cross-reactions are observed very in-frequently [50]. A cross-reaction may occur when asIgE antibodies against a given allergen recognize it and bind to similar protein from a different source. In terms of epitopes, this protein is characterized by a high degree of similarity or may even be identical. The discoveries of the structure of allergens and of the T-cell receptor (TCR), the introduction of the notion of epitope, and the development of new diagnostic techniques (e.g. immunoblotting) all made it possible to partially understand the pathophysiology of cross-allergies [51]. An allergy that is a result of cross-reacting foods is a very difficult problem from a diagnostic standpoint. The assessment of these reactions requires the application of suitable research methods. These methods should combine the analysis of individual proteins responsible for cross-reactions (both those contained in eHF and those forming de novo, as well as those found in various allergen extracts) with the simultaneous assessment of the antibodies contained in the investigated sera. In the future the diagnosis of allergy to eHF should be confirmed by means of tests utilizing recombinant allergens and new diagnostic techniques such as immunoblotting or Immu-noCAP ISAC (Immuno Solid-Phase AllergoChip) [52-58]. When deciding on which additional tests should be ordered it should therefore be kept in mind that hypersensitivity reactions to eHF have an unknown IgE-mediated, non-IgE-mediated or mixed underlying mechanism. Hence, it cannot be ruled out that patients who have IgE-mediated CMPA may develop a non-IgE-mediated or mixed eHF allergy. In spite of convincing symptoms of the condition that provide information as to the possible mechanism, in many cases circulatory asIgE remain undetected. The results of the 2011 study by Söderström et al. suggest that lowering the asIgE detection threshold in small children is justified [59].

Performing cutaneous tests with eHF, such as skin prick tests (SPTs, in this case prick-by-prick tests, to be precise), skin application food tests (SAFTs), or patch skin tests (PSTs), in the course of the present study was often impossible due to the extent and severity of AD symptoms or other technical issues related to the age of the children undergoing diagnosis. Nor can the results of prick-by-prick, PST or SAFT tests for eHF be compared directly, as their standardization poses a considerable difficulty; clinicians are thus forced to conduct a challenge test that will confirm or rule out eHF allergy anyway [23, 60].

So far our observations may only be based on the time elapsed between eHF ingestion and the presentation of symptoms. Consequently, both skin tests (SPT, SAFT) and the determination of asIgE levels in blood serum may play a rather insignificant role in the diagnosis of eHF. So far positive and negative predictive values (PPV and NPV) find application only in the diagnostics of CMPA [2, 61], as is the case with cellular activation tests, the histamine release microfiber method (HR-MM), the cellular antigen stimulator test (CAST-ELISA) or the basophil activation test (BAT) with CD63 and CD203c molecules – all used in the diagnosis of the non-IgE-mediated immune mechanism [62-64]. When suspecting allergy to eHF a challenge test should therefore be carried out. However, this test is often not performed, since the parents, who witness major improvements in the child’s condition after the introduction of AAF into the diet, refuse to let the child be subjected to a challenge with eHF. In these situations the diagnosis ex juvantibus principle is followed [20]. Therapeutic management is a consequence of the fact that allergy to eHF poses a complex clinical and diagnostic problem. In this clinical context the type of elimination diet, its extent, and its duration need to be highly individualized [2, 20, 39]. It is furthermore important to confirm the need for its prescription beforehand based on the medical history, the clinical picture, the available tests, and food challenge tests (depending on the indications). This approach decreases the risk of the unjustified prescription of an elimination diet [17, 20, 30]. The ability to outgrow allergies is dependent on the mechanism of the hypersensitivity reaction to food. Children exhibiting non-IgE-mediated intolerance outgrow food allergies sooner than those who display an IgE-mediated mechanism [2]. Genetic engineering and molecular allergology offer new diagnostic possibilities. These methods make it possible to obtain recombinant antigens on an industrial scale. The establishment of the molecular structure of allergenic protein will probably make it possible to determine which single molecules present in the native eHF allergenic material are the most allergy-inducing. These techniques might also make it possible to carry out detailed identification and determination of specific allergen fractions in compound mixtures, or to identify antibodies bound to cleft material by means of antiglobulin antibody markers [65, 66]. These methods will likely provide more precise diagnostic pointers. Even though we do not have these methods at out disposal in basic allergological diagnostics, they are used in scientific applications. Discoveries in the fields of molecular biology and physics have always been followed by the development of increasingly non-allergenic therapeutic preparations to be used in the treatment of food allergy [67-69].

In summary, it should be noted that predicting allergies to eHF (in terms of probability) and/or diagnosing eHF allergies is a very complex process, which should be based on careful analysis at each stage of clinical studies and observations. As of today there are no sufficiently reliable tests with the required specificity and sensitivity that would make it possible to unambiguously predict an eHF allergy; nor are the data gathered from patient history sufficient. The clinical picture of CMPA manifestation and in vivo and in vitro diagnostic tests for this allergy do not yet provide an unambiguous answer to the following question: which elimination diet (elemental formulae-based vs. eHF-based) should be initially prescribed to which children?

Conclusions

Children with IgE-mediated, non-IgE mediated and IgE/non-IgE mediated (mixed) CMPA who were allergic to eHF-W and eHF-C presented with symptoms of GI disturbance and atopic dermatitis in response to CMP.

Children with CMPA who present with allergic reactions to eHF-W should receive AAF, since the transition from eHF-W to eHF-C therapy is very likely to fail. The efficacy of eHF-C in children presenting with CMPA-related anaphylactic reactions requires further investigations.

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