METHODS AND MEANS FOR THE TREATMENT OF HPV INDUCED INTRAEPITHELIAL NEOPLASIAS

Abstract

The current invention provides improved methods and means for the treatment of virally induced intraepithelial neoplasias of the anogenital tract, such as HPV induced vulvar, cervical, vaginal, penile and anal intraepithelial neoplasias (VIN, CIN, VAIN, PIN and AIN). The invention provides a method of treatment of a subject suffering from an anogenital intraepithelial neoplasia comprising at least the steps of first determining whether the subject has a T-cell reactivity for viral early antigens, in particular high risk type HPV antigens; and subsequently a local treatment of the neoplasia with immune modulating compounds eliciting local inflammation if the subject scores positive for the T-cell reactivity, preferably a CD4+ response against HPV early antigens. The invention also comprises methods and means to induce or further stimulate a cellular immune response against HPV antigens, prior to or during treatment with the immune modulating compound capable of eliciting a local inflammatory response.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The current invention relates to the field of medicine, in particular to the areas of immunomodulation, immunotherapy and prophylaxis of HPV infections and neoplastic disease.

2. Background of the Invention

Anogenital tract infections with high-risk human papillomaviruses (HPV) are very common (1-3), causing lesions in, on and/or around the areas of the anus, rectum, penis, vulva, vagina and cervix. Fortunately, the majority of infected subjects clear the infection (4; 5). A persistent infection with a high risk HPV, mostly HPV-16, can lead to neoplasia of the anogenital tract, of which cervical intraepithelial neoplasia (CIN) and cervical carcinoma are the most well-known (6; 7). HPV-16 infection may also cause a chronic skin disorder of a) the vulva known as vulvar intraepithelial neoplasia (VIN) (8-10), b) the anus called anal intraepithelial neoplasia (AIN), c) the vagina designated as VAIN and d) the penis known as PIN. In contrast to CIN, which in general is effectively treated by eradication of the area involved, these other disease have a chronic nature with high relapse rates after standard treatments (11-13).

The use of immune modifiers, causing inflammatory reactions, have been applied for the treatment of VIN. In particular Imiquimod therapy has been put forward as an alternative approach for the treatment of VIN. Chemically, imiquimod is 1-(2-methylpropyl)-1H-imidazo[4,5-c]quinolin-4-amine. This immune response modifier acts through Toll-like receptor 7 of the innate immune system resulting in the secretion of a multitude of proinflammatory cytokines, among which interferon. There is recent evidence that imiquimod also possesses direct pro-apoptotic activity against tumor cells (14-16). Topical application preserves the anatomy and function of the vulva while surgical excision or ablation of affected skin may be extensive and disfiguring and can carry considerable psychosexual morbidity. Clinical success rates differ and are estimated on 30-87% (17-21).

The HPV-16 early antigens E2, E6 and E7 are among the first of proteins that are expressed in HPV-infected epithelia. Previous studies on HPV-specific T-cell immunity against these early antigens showed that type 1 (IFN-γ) T-cell memory against the early antigens can be detected in the majority of healthy sexually active individuals, but is weak or absent in patients with HPV-16-induced cervical neoplasia (22-24). In combination with earlier reports that point at a role for CD4+ T-cells in the protection against progressive HPV-infection (reviewed in 25), data argue that CD4+ type 1 T-cell response against the early antigens of HPV-16 may play an important role in the protection against progressive HPV-16-induced disease.

The goal of the current invention is therefore to provide improved methods and means for the treatment of virally induced intraepithelial neoplasias of the anogenital tract, such as VIN, CIN, VAIN, PIN and AIN.

SUMMARY OF THE INVENTION

The invention achieves its goal by examining whether a subject has developed an immune response against viral early antigens. The current invention demonstrates a decisive role of HPV-specific T cell immunity in the success or failure of treatment with immune modifiers causing local inflammation such as TLR activating compound like Imiquimod. The specification provides a detailed analysis with respect to the magnitude and cytokine polarization of the HPV-16-specific CD4+ T-cell response in patients with high grade VIN. The invention demonstrates that chronic exposure of the immune system to the HPV viral proteins results in the induction of interferon gamma (IFNγ) T-cell immunity in about half of the patients. Importantly, the presence of these type 1 (IFNγ) T-cell responses is associated with a favorable clinical response to treatment with immune modifiers, such as imiquimod that is used in this example. Implications of the invention are that for effective treatment with immune modifiers causing local inflammation, an immune response against HPV early antigens should first be determined. If absent, an immune response against HPV early antigens may be raised via methods known in the art, in order to achieve optimal results from treatment with immune modifying compounds causing local inflammatory responses. Since the use of immune modifiers such as imiquimod is demonstrated to be much less or not effective in individuals not having an CD4+ T-cell response against viral early antigens, this group of subjects may first be treated with medicaments in order to elicit a T-cell response against viral antigens. If this is not sufficiently successful, refractory individuals are preferably treated by other means which may be more effective, such as surgical excision or ablation of affected skin or alternative medication. Moreover, the negative side effects of treatment with immune modifiers causing local inflammation, such as itching, burning and pain, may be avoided for the group of subjects wherein these compounds and/or compositions are less effective or even ineffective, due to the absence of an immune response against viral early antigens.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A: freshly isolated peripheral blood mononuclear cells from 20 patients with high-grade HPV-16-associated VIN were tested in short-term proliferation assays using a complete set of HPV-16 E2, E6, and E7-derived peptide pools. Responses were scored positive when the proliferation (cpm) of ≧6 of 8 test wells exceeded the mean proliferation ±3×SD of the control (medium only) wells, and the mean stimulation index of all test wells over control wells was ≧3. Memory response mix (MRM), consisting of a mixture of recall antigens, was used as a positive control. The stimulation indices of responses scored positive are indicated.

FIG. 1B: supernatants of the positive proliferative responses indicated in A were analyzed for the presence of IFNγ, tumor necrosis factor α, IL-2, IL-4, IL-5, and IL-10 by cytometric bead array. The indicated layout is used for the six measured cytokines; a filled square represents antigen-specific cytokine production. Cut-off values were based on the standard curves of the different cytokines (50 pg/ml for IFNγ and 10 pg/ml for the remaining cytokines). Antigen-specific cytokine production was defined as a cytokine concentration above cut-off level and >2× the concentration of the medium control.

FIGS. 2A and 2B: Human papillomavirus 16-specific IFNγ-producing T-cell responses in 2 representative patients with high-grade VIN (#2, left and 10, right). T-cell responses are shown at week 0 (before imiquimod treatment), week 8 (during imiquimod treatment) and at week 16 (after imiquimod treatment). Local application of 5% imiquimod containing cream does not result in enhanced systemic HPV-16-specific T-cell responses. Note that the magnitude of the T-cell responses varies slightly over the different time points. The mean number of spots and SE induced by the medium control or the peptides present in the E2, E6 and E7 pools per 100,000 PBMC are depicted. As positive control, the memory recall mix (MRM) was used. C and D, Patients with pre-existing HPV-16-specific T-helper type 1 responses show objective clinical responses after imiquimod treatment. A typical example is shown. C, biopsy-proven VIN3 lesion of patient #5 before imiquimod treatment; D, the same vulvar area of patient #5 after 16 weeks of treatment.

FIG. 3: IgG and IgA reactivity to HPV-16 VLPs over time in 17 VIN3 patients treated with imiquimod. At least two serum specimens were tested in every patient. Serological responses are shown at week 0 (before imiquimod treatment), week 8 (during imiquimod treatment) and at week 16 (after imiquimod treatment). The OD values are depicted as median±SD of positive responses. The OD values were calculated by subtraction of the background response value and the mean OD value of the young children's sera.

DETAILED DESCRIPTION OF THE INVENTION

In a first embodiment, the current invention provides a method of treatment of a subject suffering from an anogenital intraepithelial neoplasia comprising at least the steps of:

• (i) determining whether the subject has T-cell reactivity for viral antigens; and
• (ii) subsequent local treatment of the neoplasia with immune modulating compounds eliciting local inflammation, in a patient scoring positive for T-cell reactivity against HPV antigens in step (i).

T-cell reactivity to viral antigens, in particular to HPV early antigens, more in particular HPV E2, E6 and E7 proteins from high risk types, such as HPV 16, HPV 18 and HPV 33, may be determined on blood samples and isolated cells therefrom, using standard assays such as those described in the examples section of this specification and/or in WO 02/070006 (incorporated herein by reference), T-cell proliferation assays, INFγ ELISPOT assays, cytokine multiplex assays or ELISA assays. In particular a CD4+ T cell response producing IFNγ (type 1 T-cell response) is shown here to be highly beneficial for the local treatment of anogenital tract intraepithelial neoplasias with immune modifiers. A CD4+ immune response against viral early antigens or epitopes bound on MHC class II molecules is in particular advantageous. Part of the invention is the activation of professional antigen presenting cells such as dendritic cells, macrophages and NK cells, which are useful for eliciting an effective local inflammatory reaction against virally infected cells and/or neoplasias in the anogenital area.

A CD8+ cytotoxic T cell response, responding to MHC class I bound viral epitopes, may further enhance an effective immune response against HPV infected cells, in particular in the anogenital epithelia.

Preferably the immune response and local inflammation induced in the method of the invention by the application of immune modifying compounds, preferably immune modifying compounds that are capable of inducing local inflammation and/or eliciting a local inflammatory response. Most preferably an immune modifying compound or composition to be used according to the invention is capable of activation of the innate immune system, which can be activated particularly well via Toll like receptors (TLR's), including e.g. TLR's 1 to 10. Compounds capable of activating TLR receptors and modifications and derivatives thereof may be used for inducing a local inflammatory response and are well documented in the art (ref 51). TLR1 may be activated by bacterial lipoproteins and acetylated forms thereof, TLR2 may in addition be activated by Gram positive bacterial glycolipids, LPS, LPA, LTA, fimbriae, outer membrane proteins, heat shock proteins from bacteria or from the host, and Mycobacterial lipoarabinomannans. TLR3 may be activated by dsRNA, in particular of viral origin, or by the chemical compound poly(I:C). TLR4 may be activated by Gram negative LPS, LTA, Heat shock proteins from the host or from bacterial origin, viral coat or envelope proteins, taxol or derivatives thereof, hyaluronan containing oligosaccharides and fibronectins. TLR5 may be activated with bacterial flagellae or flagellin. TLR6 may be activated by mycobacterial lipoproteins and group B Streptococcus heat labile soluble factor (GBS-F) or Staphylococcus modulins. TLR7 may be activated by imidazoquinolines. TLR9 may be activated by unmethylated CpG DNA or chromatin—IgG complexes.

In particular TLR3, TLR7 and TLR9 play an important role in mediating an innate immune response against viral infections, and compounds capable of activating these receptors are particularly preferred for use in the methods of local treatment and in the compositions or medicaments according to the invention. Particularly preferred compounds comprise, but are not limited to, dsRNA, poly(I:C), unmethylated CpG DNA which trigger TLR3 and TLR9 receptors. Most preferably TLR7 activating compounds are used in this invention, comprising compounds such as Imidazoquinolines (examples: Imiquimod and/or R-848/resiquimod), loxoribine (7-allyl-8-oxoguanosine) and bropirimine (2-amin-5-allyl-8-oxoguanosine), which have been shown to have potent immuno-stimulatory and antiviral activities and are capable of inducing proinflammatory cytokines such as IFN-α, TNF-α, IL-6 and/or IL-12.

Other compounds that may be applied in the method and pharmaceutical compositions or medicaments according to the invention to stimulate or to further enhance a local inflammatory response comprise chemokines and cytokines that are members of the inflammatory pathway. Examples are the type I interferons (interferon α and β) and the cytokines, IL-1, TNF-α, IL-6, IL-8 (CXCL8) and IL-12 and/or the chemokines CXCL-1, 2, 3, 7, 8, 10, 12, 13; CCL-2, 3, 4, 5, 11, 18, 20, 27; XCL-1 and CX3CL-1.

The methods of treatment and the pharmaceutical compositions according to the invention are particularly suitable for the treatment of anogenital intraepithelial neoplasias induced by viral infections, in particular Human Papilloma Virus (HPV) infections, more in particular of the high risk types, comprising HPV-16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, and 68 types. However, also other infections or co-infections in these epithelial regions with (myco)bacteria, fungi and/or other viruses, such as Herpes viruses (HSV-1, HSV-2), HIV and/or Cytomegalovirus (CMV), resulting from failure of the immune system to protect against, may be successfully treated by the methods and the medicaments according to this invention. The invention is suitable for treatment of any mammal which can be (co-)infected with HPV, HSV and CMV viruses, and is most suitable for use on human subjects and/or patients.

The neoplasia to be treated with the methods and medicaments according to the current invention may be any HPV induced neoplasia, preferably in an epithelial tissue, in the anogenital area and/or anogenital tract, comprising the vulva, vagina, cervix, penis, scrotum, anus and rectum. The neoplastic disorders to be treated comprise Cervical Intraepithelial Neoplasia of various grades (CIN I, II and III), Vulvar intraepithelial neoplasias of various grades (VIN I, II and III) and Vaginal intraepithelial neoplasias (VAIN) and anal intraepithelial neoplasia (AIN). Also male subjects suffering from virally induced neoplasias in the anogenital area and/or tract, such as but not limited to, Penile intraepithelial neoplasia (PIN) and Anal intraepithelial neoplasia (AIN), may be treated according to this invention.

In a particularly preferred embodiment the current invention comprises a step to elicit (de novo) or to enhance a (pre-existing) immune response against a viral infection. A T cell response, and in particular a CD4+ T cell response, is shown to be particularly advantageous for the methods according to this invention. Therefore, such a T cell response may be generated, accelerated, prolonged or enhanced via various methods known in the art of immunology and vaccination. An immune response may be raised or boosted against one or more viral antigens, in particular HPV early antigens, although antigens from other viruses and (myco)bacterial antigens may also be used or even combined. Particularly preferred are the use of one or more HPV early antigens selected from the HPV early proteins E2, E6 and E7 from high risk types. Many CTL and T-helper epitopes, capable of inducing T cell responses by IFN-γ ELISPOT assays have been identified by the current inventors (WO 02/070006). Preferred is the use of peptides of a specific length, long enough to avoid direct binding in the MHC groove. Longer peptides, preferably longer than about 12, more preferably about 15, 18, and most preferably from 22 up to 45 amino acids, require processing and are large enough to be taken up and processed internally by professional antigen presenting cells, such as dendritic cells. Preferred epitope comprising peptides from the HPV-16 E7 protein comprise amino acid stretches 1-22 31-52, 41-62, 43-77, 51-72 and 77-98 of SEQ ID No. 1. Preferred epitope comprising peptides from the HPV-16 E2 protein comprise amino acid stretches 31-75, 91-120, 151-195, 271-300, 286-315, 301-330, 316-345 and 331-365 of SEQ ID No. 2. Preferred epitope comprising peptides from the HPV-16 E6 protein comprise amino acid stretches 31-52, 81-102, 91-112, 111-132, 121-158 and 131-152 of SEQ ID No. 3. The choice of suitable peptides and viral epitopes comprised therein does not depend on the HLA type of the subject to be treated but will, among other factors, depend on the particular viral infections it carries. The skilled person will be able to readily find and substitute the amino acid stretches of these HPV-16 peptides for the corresponding peptides from other high risk and highly homologous HPV types.

The administration of viral antigens in order to elicit a T-cell response, in particular a CD4+ T cell response, may be combined with the administration of CD40 receptor and/or 4-1-BB receptor activating compounds or agonists. These may be selected from known compounds, such as various natural or synthetic ligands of these receptors and/or (agonistic) antibodies or fragments and derivates thereof, as described in WO 03/084999, in order to enhance and/or prolong an immune response of peptide vaccination by the activation of dendritic cells, which will aid in the building up of a local inflammatory response.

Typically before or after determining whether a CD4+ T cell response against viral antigens is present, treatment of subjects with intraepithelial disorders of the anogenital tract according to the invention may consist of a first administration of antigens. This may for instance comprise an injection with one or more high risk HPV E2, E6 and/or E7 antigens, preferably comprising peptides with epitopes as described above, which may be administered either alone or in different pharmaceutical compositions comprising various adjuvants known per se. Preferably a vaccination scheme is used which results in a strong HPV early-antigen-specific T-cell response, preferably of CD4+ T cells of type 1, that is in particular associated with the antigen-specific production of interferon-γ. Vaccination schemes and the use of adjuvants is known in the art and are readily available through the literature reported in the online PubMed database and may for instance also be found in Current Protocols in Immunology, Wiley Interscience 2004. At the peak of the T-cell response, comprising a strong CD4+ T cell response, which in general is about 1-2 weeks (but not limited to this period) after the last vaccination, the immune modifying agent or agents are applied locally in or on the lesions to be treated. The immune modifying agent, preferably an inflammation inducing agent as described herein before may be applied topically by various methods known to the skilled physician. This may for instance be carried out by using an ointment or cream, or applied with transdermal patches or may be injected in or around or nearby the intraepithelial lesion to be treated. At regular intervals thereafter the immune modifying agent(s) is applied locally in order to sustain the local inflammation until the lesion has disappeared. Optionally, booster doses of the viral antigens may be administered during this treatment to prolong or to enhance the T-cell response and improve the clinical outcome of the treatment. Alternatively, local application of immune modifying, or preferably inflammation inducing agents, precedes and/or takes place during and/or after the immunization/vaccination procedures.

The current invention also provides for new medicaments for use in the method of treatment according to this invention. Formulation of medicaments, ways of administration and the use of pharmaceutically acceptable excipients are known and customary in the art and for instance described in Remington; The Science and Practice of Pharmacy, 21^nd Edition 2005, University of Sciences in Philadelphia. Pharmaceutical compositions and medicaments of the invention may thus comprise binders such as lactose, cellulose and derivatives thereof, polyvinylpyrrolidone (PVP), humectants, disintegration promoters, lubricants, disintegrants, starch and derivatives thereof, sugar solubilizers, immuno-stimulatory adjuvants or other excipients. The invention provides methods and means to formulate and manufacture new medicaments and/or pharmaceutical formulations for the treatment of anogenital intraepithelial neoplasias and/or infections of these epithelia in subjects scoring positive for a T-cell response against viral antigens such as HPV, CMV and HSV antigens, in particular high risk HPV early antigens. Medicaments according to this invention comprise as an active component an immune modulating compound, capable of inducing a local inflammatory response, and are preferably Toll like receptor activating compounds, capable of activating TLR's 1 to 10, and most preferably a TLR-3, TLR-7 and/or TLR-9 activating compounds. TLR activating compounds which are highly suitable for use in pharmaceutical compositions and medicaments according to the invention comprise bacterial lipoproteins and acetylated forms thereof, bacterial glycolipids, bacterial outer membrane proteins, bacterial heat shock proteins, bacterial flagellae or flagellins, fimbriae, group B Streptococcus heat labile soluble factor (GBS-F), Staphylococcus modulins, Gram positive LPS or lipid A, LTA, Gram negative LPS or LTA, mycobacterial lipoarabinomannans, mycobacterial lipoproteins, unmethylated CpG DNA, chromatin—IgG complexes, dsRNA, poly(I:C), viral coat or envelope proteins, taxol or derivatives thereof, hyaluronan containing oligosaccharides, fibronectins, imidazoquinolines and heat shock proteins from the host organism. In particular dsRNA, poly(I:C), unmethylated CpG DNA and other substances which trigger TLR3 and TLR9. Most preferably TLR7 activating compounds are used, such as but not limited to Imidazoquinolines (for example Imiquimod and/or R-848/resiquimod), loxoribine (7-allyl-8-oxoguanosine), bropirimine (2-amin-5-allyl-8-oxoguanosine) and derivatives and analogues thereof. Imidazoquinolines are the most highly preferred compounds for use according this invention.

A pharmaceutical composition according to the invention may optionally comprise one or more compounds capable of further stimulating a local inflammatory response, such as chemokines and cytokines that are part of the inflammatory pathway or cascade. Examples are the use of the type 1 interferons (α and β) and the cytokines IL-1, TNF-α, IL-6, IL-8 (CXCL8) and IL-12 or the chemokines CXCL1, 2, 3, 7, 8, 10, 12, 13; CCL2, 3, 4, 5, 11, 18, 20, 27; XCL1 and CX3CL1. Also substances and compounds capable of stimulating production of these cytokines and chemokines in situ may also be advantageously admixed to the pharmaceutical compositions and medicaments of this invention.

In yet another embodiment the invention comprises a kit of parts, comprising one or more, preferably at least two, components selected from:

• • an immune modifying agent, preferably an inflammation inducing agent,
  • a compound or a composition capable of further stimulating a local inflammatory response comprising chemokines and/or cytokines,
  • an HPV vaccine comprising HPV derived peptides, and/or HPV peptides and
  • reagents for the detection of a cellular immune response against HPV.

DEFINITIONS

Intraepithelial neoplasia is precancerous cell growth, a synonym for dysplasia. Cervical Intraepithelial Neoplasia (abbreviated “CIN”) is a cervical condition caused by a sexually transmittable viruses such as low or high risk Human Papilloma Viruses. CIN is also called Cervical Dysplasia. CIN is classified as I, II or III depending on its severity. It is considered a pre-cancerous abnormality. The mildest form, CIN I rarely progresses to cancer. The more severe forms, CIN II and CIN III can develop into malignancies if not treated adequately. Vulvar Intraepithelial Neoplasia (VIN) is the presence of abnormal cells in the vulvar skin. It can occur in one area or several areas in the vulvar skin at the same time. Also VIN occurs in three different degrees of severity or stages, similar to CIN. VAIN stands for vaginal intraepithelial neoplasias and is the analogous neoplasia in the vagina.

Male forms of intraepithelial neoplasias comprise Penile intraepithelial neoplasia (PIN). Penile intraepithelial neoplasia is a rare pre-cancerous disease of the outer skin layer (epidermis) of the penis. It is also referred to as Erythroplasia of Queyrat, Bowen's disease of the penis, in-situ squamous cell carcinoma of the penis or P.I.N. Lesions usually appear on the glans or inner aspect of the foreskin and are almost always found in uncircumcised men. If left untreated, 10-30% of cases develop into invasive squamous cell carcinoma (cancer) of the penis. Uncircumcised males over 50 years of age are most at risk of getting penile intraepithelial neoplasia, although it may rarely occur in younger men. Penile intraepithelial neoplasia is associated with chronic infection with human papilloma virus (HPV), the cause of genital warts, and immune suppression by medications or disease.

Anal intraepithelial neoplasia (AIN) occurs both in men and women and is believed to be a precursor of anal squamous cell cancer. Its incidence is rising in high-risk groups, particularly those infected with the human immunodeficiency virus (HIV). The etiology of AIN is intricately linked with human papilloma viruses, although a role for infection or co-infection with other viruses is not excluded. There is yet no standard management for AIN and this is mainly due to difficulties in both diagnosis and treatment. A variety of treatment options have been tried with varying success. Surgery is associated with significant recurrence, particularly in HIV-positive patients.

Intraepithelial neoplasia is also referred to as squamous intraepithelial lesions, for which low grade and high grade forms are distinguished, analogous to VIN, CIN, PIN, VAIN or AIN stage I or stages II-III respectively.

EXAMPLES

Methods and Materials

Patients

Twenty-nine women with high-grade VIN (age range, 24-73 years; median age, 47 years) were recruited from the departments of gynecology of the Academic Medical Center, and Leiden and Erasmus University Medical Center, The Netherlands. On the average, these patients had been diagnosed with VIN3 5, 4 years before enrollment in the study (range, 6 months-15 years). Eighteen women had undergone previous treatments for VIN3 (surgical excision, laser therapy or imiquimod treatment (#21, 24, 27)) before study entry.

Seventeen of these 29 subjects (age 29-60 years, median 43 years) were experimentally treated with a 5% imiquimod cream. The patients were asked to apply the cream to the affected areas on the vulva twice weekly overnight for a maximum period of 16 weeks. In order to analyze the effect of imiquimod treatment on the HPV-16-specific immune response, we collected serial blood and serum samples before the start of imiquimod treatment (T=0), after 8 weeks of treatment (T=8), and at the end of treatment (T=16). Vulvar lesions were assessed by direct measurement and photographic records at entry, and after 8 and 16 weeks of treatment. Clinical responses were defined as a complete response (CR), a partial response type1 (PR1), as defined by a reduction in lesion diameter from 76-99%, a partial response type2 (PR2), as defined by a reduction in lesion diameter from 26-75%, or no clinical response.

From 20 of 29 women peripheral blood mononuclear cells (PBMCs) were isolated and directly used in order to analyze HPV-16-specific proliferative T-cell reactivity. Of these 20 women, 8 patients had also participated in the imiquimod study. In 6 cases blood was taken 3 months (#1), 4 months (#10), 10 months (#5) to over 1 year (#12, 13 and 15) after the end of the imiquimod study, in the other 2 cases (#2, 4) blood was taken within 4 weeks after the start of treatment. Serum was collected to study the presence of virus-like particle (VLP) L1-specific antibodies.

All subjects were typed for HPV by GP5+/6+ PCR followed by reverse line blot analysis as described previously (26). The study design was approved by the Medical Ethical Committees and all women gave written informed consent.

Antigens

A set of peptides spanning the whole HPV-16 E2, E6 and E7 protein were used for the T-cell proliferation assays. The E2 peptides consisted of twenty-two 30-mer peptides with a 15-amino acid overlap and the COOH-terminal peptide with a length of 35 amino acids. For the T-cell proliferation assays, the E2 peptides, 32-mer peptides of the E6 protein, and the 35-mer peptides of the E7 protein with an overlap of 14 amino acids were used in pools of two peptides per pool. For the IFNγ ELISPOT assays, the peptides used spanned the HPV 16 E2, E6 and E7 protein and consisted of the most immunogenic regions of the E2 30-mer peptides (22) and fifteen E6 and nine E7 overlapping 22-mer peptides. The peptides were synthesized and dissolved as described previously (27). The peptide pools are indicated by the first and last amino acid of the region in the protein covered by the two peptides (e.g., E21-45, residues 1-30 and 16-45). Memory response mix (MRM), consisting of a mixture of tetanus toxoid (0.75 limus flocculentius/ml final concentration; National Institute of Public Health and Environment, Bilthoven, The Netherlands), Mycobacterium tuberculosis sonicate (2.5 μg/ml; generously donated by Dr P. Klatser, Royal Tropical Institute, Amsterdam, The Netherlands) and Candida albicans (0.005%, HAL Allergenen Lab. Haarlem, The Netherlands), was used as a positive control.

Short-Term T-Cell Proliferation Assay

Freshly isolated PBMCs were incubated with 12 pools of HPV-16 E2-derived 30-mer peptides, 4 pools of E6 32-mer peptides, and 2 pools of E7 35-mer peptides (each pool consisted of two overlapping peptides). PBMCs were seeded at a density of 1.5×105 cells/well in a 96-well U-bottomed plate (Costar, Cambridge, Mass.) in 125 μl of Iscove's medium (IMDM; BioWhittaker) supplemented with 10% autologous serum. HPV-16 E2-, E6-, and E7-derived peptides were added at a concentration of 10 μg/ml/peptide. Medium alone was taken along as a negative control, and MRM (dilution, 1:50) served as a positive control. For each peptide pool, eight parallel microcultures were incubated. Fifty μl of supernatant from the microcultures was taken at day 6 after incubation and stored at −20° C. until cytokine analysis. Peptide-specific proliferation was measured at day 7 by [3H]-thymidine incorporation. Cultures were scored positive when the proliferation of 75% of the test wells exceeded the mean proliferation+3×SD of the control wells containing medium only, and the stimulation index, defined as the mean of all test wells divided by the mean of the control wells, was ≧3(22).

Analysis of Cytokines Associated with HPV-16-Specific Proliferative Responses

The detection of cytokines in the supernatants of the short-term proliferation assays was performed using the cytometric bead array (CBA) (Becton Dickinson). This technique allows the simultaneous detection of six different Th1 and Th2 cytokines IFNγ, tumor necrosis factor α, interleukin (IL)-2, IL-4, IL-5, and IL-10. The CBA was performed according to the manufacturer's instructions. Cut-off values were based on the standard curves of the different cytokines (100 pg/ml for IFNγ and 10 pg/ml for the remaining cytokines). Antigen-specific cytokine production was defined as a cytokine concentration above cut-off level and >2× the concentration of the medium control (23; 28).

Analysis of HP V-16-Specific T-Cell Reactivity by IFNγ Elispot

The number of IFNγ producing HPV-specific T-cells, present in the peripheral blood of the 17 patients treated with imiquimod, was quantified using ELISPOT that was performed as described previously (29; 30). Briefly, PBMC were thawed, washed and seeded at a density of 2×106 cells per well of a 24-well plate (Costar, Cambridge, Mass.) in 1 ml of IMDM (Bio Whittaker, Verviers, Belgium) enriched with 10% human AB serum, in the presence or absence of indicated HPV 16 E2, E6 and E7 peptide pools. Peptides were used in pools of 4-5 peptides at a concentration of 5 μg/ml/peptide. The peptides, as indicated by their first and last amino acid in the protein, were used in the following pools: E2-I: 1-30, 16-45, 31-60, 46-75; E2-II: 61-90, 76-105, 91-120, 106-135; E2-III: 121-150, 136-165, 151-180, 166-195; E2-IV: 271-300, 286-315, 301-330, 316-345, 331-365; E6-I: 1-22, 11-32, 21-42, 31-52; E6-II: 41-62, 51-72, 61-82, 71-92; E6-III: 81-102, 91-112, 101-122, 111-132; E6-IV: 111-132, 121-142, 131-152, 137-158; E7-I: 1-22, 11-32, 21-42, 31-52; E7-II: 41-62, 51-72, 61-82, 71-92, 77-98. Following 4 days of incubation at 37° C., PBMC were harvested, washed, and seeded in four replicate wells at a density of 10⁵ cells per well in 100 μl IMDM enriched with 10% FCS in a Multiscreen 96-well plate (Millipore, Etten-Leur, The Netherlands) coated with an IFNγ catching antibody (Mabtech AB, Nacha, Sweden). Further antibody incubations and development of the ELISPOT was performed according to the manufacturer's instructions (Mabtech). Spots were counted with a fully automated computer-assisted-video-imaging analysis system (Bio Sys). Specific spots were calculated by subtracting the mean number of spots+2×SD of the medium control from the mean number of spots in experimental wells provided that the mean number of spots of the medium control wells were either <10 or >10 with a standard deviation <20% of the mean. Antigen-specific T-cell frequencies were considered to be increased when specific T-cell frequencies were 1/10,000 and at least 2× background. (30). The background number of spots was 2,6±2,2 (mean±SD), with one exception (#23, 51±10 spots).

HPV-16 VLP ELISA

For the detection of HPV-16-specific antibodies in serum we used an ELISA method previously described by Kirnbauer et al (31). Each serum sample was tested for reactivity against HPV-16 virus-like particles (VLP, baculovirus-expressed capsids comprising the L1 protein) and against bovine papillomavirus (BPV) capsids, the latter disrupted by treatment with 0.1 M carbonate buffer to serve as a negative control. Both VLP and BPV were kindly provided by Prof dr. J. Dillner (Lund University, Sweden). The patients were tested for both HPV-16-specific IgG and IgA. A set of sera of healthy children (n=8, mean age 7.3 years, range 4.3-14.1 years) was tested to determine background reactivity. For HPV-16 L1-VLP IgG type responses a cut-off OD value of 0.230 was used (mean OD=0.060; range −0.056 to 0.150; mean+2 times standard deviation=0.230). For IgA type responses a cut-off of OD=0.215 was used (mean OD=0.189; range 0.171 to 0.205).

Statistical Analysis

Statistical analysis of the HPV-16-specific proliferative responses associated with cytokine production was performed using Fisher's exact test. Fisher's Exact test (2-tailed) was used to analyze HPV-specific immunity to clinical response upon treatment with imiquimod. Statistical analyzes were performed using Graphpad Instat Software (version 3.0).

Example 1

HPV-16-Specific Cellular and Humoral Responses in Patients with High Grade VIN

VIN forms a unique aspect of HPV-induced disease because patients are frequently treated, but the infection often persists. HPV-16 is found most often. To gain a more profound insight in the CD4+ T-cell response against HPV-16 in VIN, we charted the magnitude, specificity and functionality of HPV-16 E2, E6 and E7-specific proliferative T-cell responses in a group of 20 women with HPV-16-associated high grade VIN.

PBMC isolated from VIN patients were stimulated with peptides derived from HPV-16 proteins E2, E6 and E7 as well as with a mix of common recall antigens (MRM), in a short-term proliferation assay. We have previously shown that this assay is geared towards the detection of CD4+ T-cell responses (23). HPV-16-specific proliferative T-cell responses against E2 and/or E6 were detected in 10/20 patients (FIG. 1A). E7-specific responses were detected in 5/20 subjects. Analysis of the supernatants of these T-cell cultures for the presence of type 1 and type 2 cytokines revealed the secretion of the Th1 cytokine IFNγ in 8/20 patients. In some of the patients the production of TNFα, IL-5 and IL-10 was occasionally detected (FIG. 1B). Although the overall frequency of proliferative responses is similar when compared to that previously found for cervical cancer patients, the number of patients with IFNγ-associated HPV-specific T-cell responses in these VIN patients was higher (8/20 vs 4/17, respectively (23)).

In addition to T-cell immunity, the humoral response to HPV-16 was measured in 28 VIN patients by ELISA using HPV-16 L1-VLP as antigen. Overall, HPV-16 L1-VLP IgG and IgA antibodies were detected in 25 of 28 (89%) and 13 of 28 (46%) subjects, respectively (Table 1). Based on the OD values, the HPV-16 L1-VLP-specific IgG response exceeded that of IgA (Table 1). In general, HPV-16-specific IgA responses were detected when patients displayed relatively high levels of HPV-16-specific IgG. If IgG OD values were ≧0.5, 11/19 (58%) of the samples contained HPV-16 L1-specific IgA, whereas at IgG levels <0.5 only 2/9 samples were IgA seropositive.

In conclusion, HPV-16 L1-specific humoral immunity was detected in the great majority of patients, whereas HPV-16 E2-, E6- and/or E7-specific IFNγ-associated type 1 T-cell reactivity was detected in about half of the patients tested.

Example 2

HPV-16-Specific Immunity is Associated with a More Favorable Clinical Response Upon Immunomodulatory Treatment with Imiquimod

Our analysis of HPV-16-specific proliferation indicates that a high number of the proliferative T-cell responses is associated with IFNγ production. To examine the role of these HPV-16-specific type 1 T cell responses in the success or failure of treatment with the immunomodulator imiquimod, we studied this immune response in a group of patients with high-grade HPV-16+ VIN. PBMC were isolated before (T=0), during (T=8), and after (T=16) treatment, and stored in liquid nitrogen. HPV-specific T-cell reactivity against HPV-16 peptides E2, E6 and E7 was analyzed by IFNγ ELISPOT. This is a sensitive method for the analysis of antigen-specific type 1 T-cell reactivity on frozen material (32; 33). Three of these patients had been treated with imiquimod in the year before inclusion in our study (Table 2, #21, 24 and 27). Of these 17 patients, 15 were HPV-16-positive. Pre-existing IFNγ-associated T-cell responses (T=0) were detected in 8 of 15 patients by IFNγ ELISPOT. In 5/15 patients, HPV-16-specific T-cell reactivity against E2 was detected, whereas 4/15 patients displayed a response against E6 (Table 2). None of these patients showed pre-existing T-cell responses against HPV-16 E7. In 2 cases the T=0 sample was not available and the reaction in PBMC from T=8 are shown (Table 2, #1 and 22).

Despite that for some patients one of the two follow-up samples were not available (#5, 13, 27, 28), it was clear that we could not detect a direct influence of imiquimod on the numbers of HPV-specific T-cells. In none of the patients a clear-cut increase of HPV-16-specific T-cells was detected upon imiquimod treatment (FIG. 2ab). In some cases patients had already been treated with a course of imiquimod before this study, but even this repeated treatment did not result in an increase of HPV 16 specific T-cells (Table 2, #21 and 24). Also, the HPV-16 VLP-specific IgG and IgA response did not overly change when patients were treated with imiquimod (FIG. 3).

Thirteen of the 17 women treated (76%) displayed an overt clinical response upon treatment with imiquimod as indicated by 76-100% reduction in the size of their lesion (CR or PR1, Table 2 and FIG. 2cd). Three patients showed no reduction in size of the affected area of vulvar disease, and one woman showed only minimal improvement upon treatment.

Importantly, when the group of HPV-16+ patients (n=15) was divided in patients either with or without an HPV-specific Th1 immune response, all 8 patients with an HPV-specific immune response displayed a complete or near complete clinical response (CR or PR1) upon imiquimod treatment (Table 2). In contrast, patients without an HPV-specific immune response were less likely to show such a clinical improvement (p=0.03, 2-sided Fisher's exact test).

Taken together, chronic viral antigen exposure can induce type 1 CD4+ T-cell immunity against the HPV-16 early antigens E2, E6 or E7 in patients with VIN3. The presence of these HPV-16-specific Th1 cells as detected by IFNγ ELISPOT, even though not essential for imiquimod-induced regression of VIN lesions, does increase the likelihood of a strong clinical response. The presence of L1-specific humoral reactivity was not correlated with imiquimod-induced regressions.

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Claims

1. A method for treating neoplasia induced by human papillomavirus (HPV) in a subject, comprising administering imiquimod, R848/resiquimod, loxoribine and/or bropirimine to a subject who scores positive for a CD4+ T cell response against a HPV viral antigen.

2. The method according to claim 1 wherein the HPV is selected from the group of HPV types consisting of HPV-16, HPV-18, HPV-31, HPV-33, HPV-35, HPV-39, HPV-45, HPV-51, HPV-52, HPV-56, HPV-58, HPV-59 and HPV-68.

3. The method according to claim 1, wherein the HPV-induced neoplasia is in epithelial tissue.

4. The method according to claim 2, wherein the HPV induced neoplasia is cervical intraepithelial neoplasia of any grade, vaginal intraepithelial neoplasia, anal intraepithelial neoplasia or penile intraepithelial neoplasia.

5. The method according to claim 1 wherein the HPV causes genital warts.

6. A method for treating intraepithelial neoplasia of a subject's anogenital tract and/or area which neoplasia is caused by an infectious agent, comprising administering imiquimod, R848/resiquimod, loxoribine and/or bropirimine to a subject scoring positive for a CD4+ T cell response against an antigen of said neoplasia.

7. The method according to claim 6, wherein the infectious agent is a virus, a bacterium, and/or a fungus.

8. The method according to claim 7, wherein the bacterium is a mycobacterium.

9. The method according to claim 7, wherein the virus is a herpesvirus, a human immunodeficiency virus (HIV) and/or a cytomegalovirus.

10. The method according to claim 9, wherein the herpesvirus is herpes simplex virus-1 or herpes simplex virus-2.

11. The method according to claim 1, further comprising administering to the subject an interferon, a cytokine or a chemokine that is directly involved in inflammatory pathways.

12. The method according to claim 1 wherein the detectable CD4+ T cell response against said HPV viral antigen is the result of prior or concurrent administration of said antigen to the subject.

13. The method according to claim 6 wherein the detectable CD4+ T cell response against said neoplasia antigen is the result of prior or concurrent administration of said antigen to the subject.

14. The method according to claim 12 wherein the HPV antigen was/is a peptide antigen of 12 to 45 amino acids in length which comprises an HPV early antigen from HPV E2, E6 or E7 protein.

15. The method according to claim 14, wherein the peptide:

comprises a T cell epitope; and

(ii) is capable of eliciting an interferon-γ response.

16. The method according to claim 15 wherein the peptide is one or more of:

(a) a sequence corresponding to residues 1-22, 31-52, 41-62, 43-77, 51-72 or 77-98 of SEQ ID NO:1;

(b) a sequence corresponding to residues 31-75, 91-120, 151-195, 271-300, 286-315, 301-330, 316-345 or 331-365 of SEQ ID NO:2; or

(c) a sequence corresponding to residues 31-52, 81-102, 91-112, 111-132, 121-158 and 131-152 of SEQ ID NO:3.

17. The method according to claim 1 further comprising administering to the subject a CD40 receptor-activating and/or a 4-1-BB receptor-activating compound or agonist.

18. The method according to claim 6 further comprising administering to the subject a CD40 receptor-activating and/or a 4-1-BB receptor-activating compound or agonist.

19. The method according to claim 3, wherein the imiquimod, R848/resiquimod, loxoribine and/or bropirimine is:

(A) formulated in an ointment or a cream for topical administration, or

(B) applied in a transdermal patch, or

(C) injected in, around or nearby a lesion of the epithelial neoplasia.

20. The method according to claim 6, wherein the imiquimod, R848/resiquimod, loxoribine and/or bropirimine is:

(A) formulated in an ointment or a cream for topical administration, or

(B) applied in a transdermal patch, or

(C) injected in, around or nearby a lesion of the intraepithelial neoplasia.