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Efficacy and tolerability of short-term specific immunotherapy with pollen allergoids adjuvanted by monophosphoryl lipid A (MPL®) for children and adolescents
KJ. Drachenberga, M. Heinzkilla, E. Urbana, SR. Woronieckib
a Bencard Allergie GmbH. Munich. Germany.
b Allergy Therapeutics Ltd. Worthing. UK.
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    "textoCompleto" => "<p class="elsevierStylePara">INTRODUCTION</p><p class="elsevierStylePara">Specific Immunotherapy &#40;SIT&#41; is widely accepted as a causal treatment of type I allergy&#46; In particular&#44; short-term SIT offers a convenient option and supports compliance in children and adolescents&#46; A recent advance in SIT has been provided by the incorporation of an innovative adjuvant&#44; 3-deacylated monophosphoryl lipid A &#40;MPL&#174; adjuvant&#44; Corixa&#41; in the formulation of allergy vaccines&#46; Clinically successful SIT is now thought to result from either a redressed Th1&#47;Th2 cell balance by promoting a Th1 response which produces cytokines that depress Th2 activity &#40;probably mediated by IL-12&#41;&#44; or by a down-regulation induced by IL-10 from regulatory T-cells&#44; ie immunological tolerance<span class="elsevierStyleSup">1</span>&#46; MPL&#174; adjuvant is a purified&#44; detoxified glycolipid derived from the cell walls of Salmonella minnesota<span class="elsevierStyleSup">2</span> and has been shown to induce Th1-like immunological profiles in both pre-clinical<span class="elsevierStyleSup">3</span> and clinical<span class="elsevierStyleSup">4</span> studies&#46;</p><p class="elsevierStylePara">Clinical trials of specific immunotherapy with formulations containing MPL&#174; adjuvant have so far proved encouraging&#46; A double-blind&#44; placebo-controlled &#40;DBPC&#41; multi-centre phase III study of SIT with MPL&#174; adjuvant incorporated in a vaccine containing grass and rye pollen allergoids adsorbed to L-tyrosine &#40;Pollinex&#174; Quattro&#44; Bencard Allergie&#47;Allergy Therapeutics Ltd&#41; showed good efficacy after a course of only four injections<span class="elsevierStyleSup">5</span>&#59; a further DBPC study using tree pollen allergoids showed similar success<span class="elsevierStyleSup">6</span>&#46; Efficacy in these studies was clearly indicated by symptom and medication scoring&#44; underlined by additional efficacy parameters&#46; Following therapy&#44; skin test sensitivity was found to decrease and specific IgE antibody levels only increased in the placebo groups during the pollen season&#46; Tolerability was also good in both studies&#46; However&#44; these data carried the limitation of a therapy restriction to adult patients only&#46; There are particular reasons to apply SIT for allergic disease in children&#44; because the treatment is thought to be more effective than in adults<span class="elsevierStyleSup">7</span>&#44; and there is evidence to suggest that it may impede progression from allergic rhinoconjunctivitis to asthma<span class="elsevierStyleSup">8</span>&#46; The composition of these vaccines also lends confidence in providing safety and efficacy&#46; The use of allergoids reduce allergen-specific IgE reactivity whilst maintaining induction of specific IgG<span class="elsevierStyleSup">9&#44;10</span>&#46; Also&#44; recent reviews have indicated encouraging safety profiles of the depot adjuvant L-tyrosine<span class="elsevierStyleSup">11</span> and MPL&#174; adjuvant<span class="elsevierStyleSup">12</span>&#46;</p><p class="elsevierStylePara">Therefore in a further examination of treatment outcomes&#44; an open multi-centre study was employed to evaluate these vaccines for efficacy and tolerability in children and adolescents with allergic sensitivities to tree or grass pollens&#46; Efficacy measurements comprised&#58; symptom and medication scoring &#40;global assessment&#41;&#44; skin prick test reactivity and IgG&#47;IgE antibody responses&#46; Tolerability was monitored by incidence of adverse events and safety parameters&#46;</p><p class="elsevierStylePara">METHODS</p><p class="elsevierStylePara">Patients were divided into two groups according to their allergic sensitivities&#46; Patients sensitive to grass pollen &#40;n  &#61; 26&#41; were treated in five allergy clinics in Portugal&#46; Diagnosis and inclusion criteria were&#58; male or female patients aged between 6-17 with seasonal symptoms due to grass pollen sensitisation&#44; positive skin prick test with a wheal diameter 3 mm or above&#44; RAST test &#40;or equivalent&#41; grass-specific IgE class 2 or above&#46;</p><p class="elsevierStylePara">Patients sensitive to tree pollens &#40;n &#61; 64&#41; were treated in five clinics in Poland&#46; Diagnosis and inclusion criteria were&#58; male or female patients aged between 6-17 with seasonal symptoms due to birch&#44; alder and hazel pollen sensitisation&#44; positive skin prick test with a wheal diameter 3 mm or above&#44; RAST test &#40;or equivalent&#41; birch&#44; alder and hazel-specific IgE class 2 or above&#46; Children and adolescents included in this study suffered from allergic rhinitis &#40;and&#47;or asthma&#41; or allergic conjunctivitis associated with rhinitis or asthma&#46;</p><p class="elsevierStylePara">Vaccines for the tree pollen-allergic patients were formulated with allergoids &#40;glutaraldehyde-modified extracts&#41; from three tree pollens &#40;birch&#44; alder&#44; hazel&#41;&#46; The tree pollen allergoids were adsorbed onto L-tyrosine depot adjuvant as a 2 &#37; suspension&#46; Vaccines for the grass pollen-allergic patients were formulated with allergoids produced in a similar manner from a 12 grasses and rye pollen mixture and adsorbed to L-tyrosine&#46; In total&#44; 90 patients were included and each received 3 increasing subcutaneous doses &#40;300&#44; 800&#44; 2000 standardised units &#91;SU&#93;&#41; in weekly intervals and a further top dose &#40;2000 SU&#41; at a 1-4 weeks interval&#46; Each injection was 1&#46;0 ml and contained 50 &#956;g MPL&#174; adjuvant&#46; These injections were administered before the respective pollen seasons&#46;</p><p class="elsevierStylePara">The symptom scoring scheme required patients to score their organ-related allergic symptoms for the eyes&#44; nose and lungs according to severity &#40;none &#61; 1&#44; mild &#61; 2&#44; moderate &#61; 3&#44; severe &#61; 4&#41;&#46; The points were totalled for each patient&#44; providing a maximum possible score of 12&#46; The medication score was devised by a generalised quantification of the medication intake &#40;no medication &#61; 1&#44; occasional &#61; 2&#44; frequent &#61; 3&#44; regular &#61; 4&#41;&#44; to provide a maximum score of 4&#46; The scores were taken at two timepoints&#58; the previous pollen season &#40;baseline investigation&#41; and during the pollen season after therapy&#46;</p><p class="elsevierStylePara">Titrated skin testing to identify threshold reactivity was performed at three time points&#58; before therapy and two weeks after therapy &#40;both before the pollen season&#41; and then finally after the pollen season&#46; Seven 1&#58;3 serial dilutions of allergen were tested on both forearms using either a grass pollen mixture or a birch pollen extract&#46; Histamine and allergen diluent served as positive and negative controls respectively&#46; The diluent contained glycerol with phosphate buffer and phenol preservative&#46; Wheals were measured with a computerised planimetry system &#40;Summagraphics Bitpad and Digit computer programme&#41;&#46; At the same time points&#44; blood samples were taken for determination of specific immunoglobulins &#40;AlaSTAT&#44; Diagnostic Products Corporation&#41;&#46; Tolerability was documented regarding types of local adverse events&#58; redness&#47;swelling &#40;sub-divided into sizes of area&#41;&#44; pain&#44; itching&#44; types of systemic reactions and any other adverse events&#46;</p><p class="elsevierStylePara">All data were analysed by an independent statistician&#46;</p><p class="elsevierStylePara">RESULTS</p><p class="elsevierStylePara">Patient population</p><p class="elsevierStylePara">Table I provides a summary of the patient demographics&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab01.gif"></img></p><p class="elsevierStylePara">Clinical efficacy assessment</p><p class="elsevierStylePara">All statistical significances were calculated using the Wilcoxon signed rank test&#46;</p><p class="elsevierStylePara">Symptom scores&#58; patients scored their organ related symptoms for the first pollen season &#40;baseline investigation&#44; before therapy&#41; and after therapy &#40;second pollen season&#41;&#46; Symptom scores are displayed in figures 1 and 2&#59; significant improvements were found from both groups of patients&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab02.gif"></img></p><p class="elsevierStylePara">Figure 1&#46;--Total symptom score from grass pollen-allergic patients &#40;n &#61; 23&#44; p &#60; 0&#46;01&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab03.gif"></img></p><p class="elsevierStylePara">Figure 2&#46;--Total symptom score from tree pollen-allergic patients &#40;n &#61; 63&#44; p &#60; 0&#46;01&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara">Medication scores&#58; the intake of antiallergic symptomatic medication was scored and this is summarised in figures 3 and 4&#46; Again&#44; a significant improvement was seen from both groups of patients&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab04.gif"></img></p><p class="elsevierStylePara">Figure 3&#46;--Medication scores from grass pollen-allergic patients &#40;n &#61; 23&#44; p &#60; 0&#46;01&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab05.gif"></img></p><p class="elsevierStylePara">Figure 4&#46;--Medication scores from tree pollen-allergic patients &#40;n &#61; 63&#44; p &#60; 0&#46;01&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara">Titrated skin prick test</p><p class="elsevierStylePara">The skin prick test results for grass pollen-allergic patients are summarised in figure 5 and those from tree pollen-allergic patients in figure 6&#46; Compared to baseline&#44; both groups displayed a clearly significant reduction in skin reactivity&#44; which was maintained throughout the pollen season&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab06.gif"></img></p><p class="elsevierStylePara">Figure 5&#46;--Titrated skin prick tests of grass pollen-allergic patients&#46; N &#61;  18&#44; p &#61; 0&#46;035 &#40;after therapy&#58; baseline&#41;&#44; p &#61; 0&#46;003 &#40;after pollen season&#58; baseline&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab07.gif"></img></p><p class="elsevierStylePara">Figure 6&#46;--Titrated skin prick tests of tree pollen-allergic patients&#46; N &#61;  62&#44; p &#60; 0&#46;001 &#40;after therapy&#58; baseline&#41;&#44; p &#60; 0&#46;001 &#40;after pollen season&#58; baseline&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara">Specific immunoglobulins</p><p class="elsevierStylePara">Measurement of specific IgE &#40;trees&#44; grasses&#41; showed no change after treatment but there was a slight increase during the pollen season in both groups &#40;data not shown&#41;&#46;</p><p class="elsevierStylePara">Levels of specific IgG &#40;trees&#44; grasses&#41; significantly increased after treatment and this was maintained during the pollen season&#44; as shown in figures 7 and 8&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab08.gif"></img></p><p class="elsevierStylePara">Figure 7&#46;--Specific IgG antibody response of grass pollen-allergic patients&#46; N &#61; 21&#44; p &#60; 0&#46;001 &#40;after therapy&#58; baseline&#41;&#44; p &#60; 0&#46;001 &#40;after pollen season&#58; baseline&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab09.gif"></img></p><p class="elsevierStylePara">Figure 8&#46;--Specific IgG antibody response of tree pollen-allergic patients&#46; N &#61; 57&#44; p &#61; 0&#46;003 &#40;after therapy&#58;baseline&#41;&#44; p &#60; 0&#46;001 &#40;after pollen season&#58; baseline&#41;&#46; Dispersion bars indicate standard deviation from the mean values&#46; &#160;</p><p class="elsevierStylePara">Tolerability&#58; adverse events</p><p class="elsevierStylePara">Local reaction rates are given in table II &#40;grass&#47;rye pollen SIT&#41; and table III &#40;tree pollen SIT&#41;&#46; The grass&#47; rye vaccine was used for 103 injections&#44; and following this administration 35 local reactions occurred &#40;rate &#61; 34 &#37;&#41;&#46; The tree pollen vaccine was used for a total of 256 injections&#44; which were followed by 58 local reactions &#40;rate &#61; 23 &#37;&#41;&#46; A small number of patients received 5 or 6 injections&#46; These were split volume doses&#44; following the clinician&#39;s opinion to be most appropriate for highly sensitised patients or in response to a previous local reaction&#46; Combining the data for both vaccines&#44; the overall number of injections given was 359 and the overall rate of local reactions per injection was 25 &#37;&#46; Following the final &#40;repeat&#41; dose 4 &#40;2000 SU&#41;&#44; the event rate roughly halved from that of the previous dose in both types of vaccine &#40;see tables II and III&#41;&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab10.gif"></img></p><p class="elsevierStylePara"><img src="105v31n05-13052432tab11.gif"></img></p><p class="elsevierStylePara">An analysis of the types of local events is shown in tables IV &#40;grass&#47;rye pollen SIT&#41; and V &#40;tree pollen SIT&#41;&#46; A total of 13 and 28 patients respectively experienced local events&#46;</p><p class="elsevierStylePara"><img src="105v31n05-13052432tab12.gif"></img></p><p class="elsevierStylePara"><img src="105v31n05-13052432tab13.gif"></img></p><p class="elsevierStylePara">Patients treated with the grass&#47;rye pollen vaccine displayed a lower rate of redness for the highest area size &#40;&#62; 10 cm&#44; 8 &#37;&#41; compared to the tree pollen patients &#40;&#62; 10 cm&#44; 25 &#37;&#41;&#46; However&#44; regarding redness ranging from 5 to 10 cm&#44; the grass pollen patients showed a 27 &#37; rate compared to a 9 &#37; rate found with the tree pollen patients&#46;</p><p class="elsevierStylePara">The statistic of event rates per injection also reflects the most frequent local events&#46; These were&#58; grass&#47;rye pollen SIT&#44; redness 5-10 cm &#40;20&#46;4 &#37;&#41;&#44; tree pollen SIT&#44; itching &#40;18&#46;8 &#37;&#41;&#46;</p><p class="elsevierStylePara">Some pain was observed at the injection site of the tree pollen vaccine &#40;41 &#37;&#41; and this was at a higher incidence than that found with the grass&#47;rye pollen group &#40;15 &#37;&#41;&#46; More itching &#40;31 &#37;&#41; was reported by the grass pollen patients than the tree pollen patients &#40;5 &#37;&#41;&#46;</p><p class="elsevierStylePara">No systemic reactions were documented from any of the patients treated with the grasses&#47;rye vaccine&#46; After injection of the tree pollen vaccine&#44; systemic reactions &#40;conjunctivitis&#44; rhinitis&#44; headache&#44; breathing difficulties&#44; pruritus&#41; were observed following 8&#47;256 injections&#44; &#40;rate &#61; 3&#46;1 &#37;&#41;&#46; These systemic reactions were reported from only one of the five clinics using the tree pollen vaccine&#46; No systemic reactions were observed resulting from the high doses &#40;3rd and 4th&#41; at 2000 SU&#46; Regarding the total number of injections &#40;359&#41;&#44; the total incidence of systemic reactions was 2&#46;2 &#37;&#46;</p><p class="elsevierStylePara">Other adverse events</p><p class="elsevierStylePara">Other adverse events were documented in the post injection period&#46; These were categorised as unlikely to be related to therapy&#44; and were reported using WHO adverse reaction terminology&#46; Events observed in 6&#47;26 grass&#47;rye pollen vaccine patients were&#58; respiratory system &#40;asthma&#44; rhinitis&#41;&#44; 3&#59; vision disorders &#40;conjunctivitis&#41;&#44; 3&#59; resistance mechanism disorders &#40;otitis media&#41;&#44; 1&#46; Events observed in 23&#47;64 tree pollen patients were&#58; respiratory disorders&#44; 17&#59; vision disorders&#44; 9&#59; body as a whole&#44; 7&#59; central and peripheral nervous system&#44; 1&#46;</p><p class="elsevierStylePara">DISCUSSION</p><p class="elsevierStylePara">Children and adolescents were administered a short-term SIT using 4 injections of an allergoid&#47;L-tyrosine vaccine incorporating the Th1 adjuvant monophosphoryl lipid A &#40;MPL&#174;&#41; using grass&#47;rye or tree pollen allergoid formulations &#40;Pollinex&#174; Quattro grasses&#47;rye&#44; trees&#44;&#41;&#46; Treatment with both vaccine formulations resulted in significant reductions in allergic symptoms and usage of anti-allergic medication&#46; These findings are consistent with data from placebo-controlled double-blind studies in adult patients<span class="elsevierStyleSup">5&#44;6</span>&#46; Local reactions to both tree and grass&#47;rye pollen vaccines were also found comparable to that found in these adult studies&#46; Systemic reactions were not detected in the grass pollen vaccine group&#44; and only mild events were observed in the tree pollen vaccine group&#46; Again&#44; these results compare well with those found with adults&#46;</p><p class="elsevierStylePara">A reduction in skin prick test sensitivity after treatment and after the pollen season was seen with both groups&#44; which was a marker result consistent with findings in other studies involving this short-term therapy<span class="elsevierStyleSup">5&#44;6</span>&#46; Another well-recognised marker&#44; the specific IgG antibody response&#44; increased after therapy and after the pollen season in comparison to the baseline&#46; Following therapy&#44; little change in specific IgE was seen in both groups&#44; which was again consistent with that previously found with this vaccine in the treatment of adult patients<span class="elsevierStyleSup">5&#44;6</span>&#46; This result is probably due to the Th1-inducing activity of MPL&#174; adjuvant&#44; which would bias cytokine activities to discourage an IgE response<span class="elsevierStyleSup">4</span>&#46;</p><p class="elsevierStylePara">The WHO Position Paper on allergen immunotherapy has stated that more studies are needed to determine how immunotherapy may modify the allergic disease in children<span class="elsevierStyleSup">7</span>&#46; So far&#44; although we have seen some high quality studies<span class="elsevierStyleSup">8</span>&#44; the number of publications on this topic is comparatively low&#46; At the same time&#44; researchers are suggesting that there is a real need for allergy treatment strategies such as immunotherapy for children<span class="elsevierStyleSup">13</span>&#46; Data from this open study shows that regarding both efficacy and safety&#44; the results are similar to those found in controlled studies&#46; Effective immunotherapy may significantly improve the quality of life for a child over the critical period to adulthood&#46; Additionally&#44; health authorities should note that there is also a potential pharmacoeconomic effect<span class="elsevierStyleSup">14</span>&#46;</p><p class="elsevierStylePara">In summary&#44; these results have paralleled outcomes from previously reported double-blind&#44; placebo-controlled studies in adults&#44; demonstrating a new treatment for children and adolescents with respiratory allergy to grass and tree pollens which provides clinical and immunological efficacy with good tolerability&#46;</p><p class="elsevierStylePara"> ACKNOWLEDGEMENTS</p><p class="elsevierStylePara">The following clinicians recruited grass&#47;rye pollen-allergic patients for the study in Portugal&#58;</p><p class="elsevierStylePara">Dr&#46; M&#46;A&#46; Aguilar &#40;Coimbra&#41;&#44; Dr&#46; H&#46; Costa &#40;Gaia&#41;&#44; Dr&#46; J&#46;P&#46; da Fonseca Moreira da Silva &#40;Porto&#41;&#44; Dr&#46; P&#46; Lopes de Mata &#40;Lisboa&#41;&#44; Prof&#46; M&#46; Oueiros &#40;Porto&#41;&#46;</p><p class="elsevierStylePara">The following clinicians recruited tree pollen-allergic patients for the study in Poland&#58;</p><p class="elsevierStylePara">Prof&#46; D&#46; Chmielewska &#40;Warszawa&#41;&#44; Prof&#46; P&#46; Kuna &#40;Zgierz&#41;&#44; Prof&#46; J&#46; Maloplepszy &#40;Wroclaw&#41;&#44; Prof&#46; B&#46; Romanski &#40;Bydgoszcz&#41;&#44; Prof&#46; E&#46; Zawisza &#40;Warszawa&#41;&#46;</p><p class="elsevierStylePara">MPL&#174; is a registered trademark of the Corixa Corporation&#44; Seattle&#44; WA&#44; USA&#46;</p>"
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        "resumen" => "Antecedentes&#58; La inmunoterapia espec&#237;fica &#40;ITe&#41; formulada con el adyuvante Th1 inductor 3-deacylated monophosphoryl lipid A &#40;adyuvante MPL&#174;&#44; Corixa&#41;&#44; ha mostrado una buena eficacia y tolerabilidad en el tratamiento de las enfermedades al&#233;rgicas inducidas por p&#243;lenes en adultos&#46; El objetivo de este estudio consiste en valorar el tratamiento en ni&#241;os y adolescentes&#44; 6-17 a&#241;os&#44; sensibles al polen de gram&#237;neas o &#225;rboles&#46; M&#233;todos&#58; Se llev&#243; a cabo un estudio abierto multic&#233;ntrico en 90 ni&#241;os y adolescentes&#46; Los pacientes recibieron 4 dosis por v&#237;a subcut&#225;nea de alergoides de polen de gram&#237;neas &#40;n &#61; 64&#41; o &#225;rboles &#40;n &#61; 26&#41; adsorbidos en L-tirosina y conteniendo el adyuvante MPL&#174;&#46; La eficacia se valor&#243; por una puntuaci&#243;n que recog&#237;a la evoluci&#243;n de los s&#237;ntomas y de la necesidad de medicaci&#243;n&#44; reactividad al Prick Test y respuesta IgE e IgG&#46; La tolerabilidad se valor&#243; por el registro de reacciones adversas&#46; Resultados&#58; Ambos grupos de tratamiento&#44; polen de gram&#237;neas y de &#225;rboles&#44; mostraron una reducci&#243;n significativa en las puntuaciones relativas a s&#237;ntomas y medicaci&#243;n frente a la alergia&#44; cuando se comparan frente a las puntuaciones de la estaci&#243;n anterior &#40;p &#60; 0&#44;01 en todos los casos&#41;&#46; Despu&#233;s de la terapia&#44; la reactividad al Prick Test disminuy&#243; de forma significativa en ambos grupos y los niveles en IgG espec&#237;fica al polen aument&#243; tambi&#233;n de forma significa&#46; La tolerabilidad global se mostr&#243; semejante a los resultados previos obtenidos en adultos&#46; Conclusi&#243;n&#58; La ITe de corta pauta de administraci&#243;n&#44; 4 dosis de alergoides de polen de gram&#237;neas o polen de &#225;rboles&#44; adsorbidos en L-Tirosina y con MPL&#174; como adyuvante&#44; se mostr&#243; eficaz con una buena tolerancia&#44; comparables de forma favorable con estudios previos en adultos&#46;"
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        "resumen" => "Background&#58; Specific immunotherapy &#40;SIT&#41; with pollen allergoids formulated with the Th1-inducing adjuvant 3-deacylated monophosphoryl lipid A &#40;MPL&#174; adjuvant&#44; Corixa&#41; has shown good efficacy and tolerability in the treatment of pollen allergies in adults&#46; The aim of this study was to evaluate this treatment in children and adolescents aged 6-17 years old who were sensitive to grass&#47;rye or tree pollens&#46; Methods&#58; An open&#44; multicenter study was performed using 90 children and adolescents&#46; The patients received four subcutaneous injections of grass&#47;rye &#40;n &#61; 64&#41; or tree pollen allergoids &#40;n &#61; 26&#41; adsorbed to L-tyrosine and containing MPL&#174; adjuvant&#46; Efficacy was measured by symptom and medication scoring&#44; skin prick test reactivity and IgG&#47;IgE antibody responses&#46; Tolerability was monitored by recording adverse events&#46; Results&#58; Both grass&#47;rye and tree pollen treatment groups showed significant reductions in symptom scores and anti-allergic medication use compared with the previous pollen seasons &#40;p &#60; 0&#46;01 in all cases&#41;&#46; After therapy&#44; skin prick test reactivity was significantly reduced in both groups and pollen-specific IgG was significantly increased in both groups whereas little change was apparent in pollen-specific IgE&#46; Overall tolerability was similar to results obtained in previous studies in adults&#46; Conclusion&#58; Short-term SIT using four injections of grass&#47;rye or tree pollen allergoids adsorbed to L-tyrosine and with MPL&#174; adjuvant was shown to be effective with good tolerability&#46; The treatment compared favorably with previous studies in adults&#46;"
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ISSN: 03010546
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