Predicting Response In Cervical Intraepithelial Neoplasia to Topical Imiquimod Treatment

RATIONALE: A persistent high risk Human Papilloma Virus (hrHPV) infection can cause (pre)malignant anogenital lesions of the cervix, vulva or vagina. Cervical high grade squamous intraepithelial lesions (cHSIL) have a malignant potential and require adequate therapy. The natural history of cHSIL is unpredictable: ~25% of cHSIL will regress, while 18% will progress to invasive cervical cancer. The standard treatment of histologically confirmed cHSIL is surgical excision by large loop excision of the transformation zone (LLETZ), with potential complications, such as hemorrhage, infection and an increased risk of preterm birth in subsequent pregnancies. Imiquimod cream has been studied as a non-invasive treatment alternative and the recent TOPIC-3 trial for cHSIL a complete response rate of 55% upon imiquimod therapy was reported. Imiquimod is now considered as a standard non-surgical therapy for patients with cHSIL in the Netherlands, especially in those patients with a future pregnancy wish. Side-effects of imiquimod therapy however are common and can be extensive, consisting mostly of local inflammation and burning, but also systemic adverse events such as headache and flu-like symptoms. Therapy adherence is challenging with up to 20% discontinuation of treatment due to the side effects and the 16 week treatment duration. As such, biomarkers which can predict response to imiquimod therapy are warranted, to increase therapy efficacy and to avoid side effects in patients who will not respond. Our previous work shows that clinical response to imiquimod in cHSIL is associated with a coordinated pre-existing type 1 T cell- and inflammatory myeloid cell infiltration and provided the first set of parameters that potentially can function together as a predictive biomarker CIBI (CHSIL Immune Biomarker for Imiquimod).

OBJECTIVE: This study aims to validate the potential of immune related biomarkers to predict the clinical response of patients with primary cHSIL to imiquimod and aims to explore the value of these immune biomarkers in recurrent/residual cHSIL to predict treatment responses for imiquimod and aims to explore their potential in spontaneous regression of cHSIL (CIN2).

STUDY DESIGN: Multicenter, real-life prospective cohort validation study.

STUDY POPULATION: We aim to include 316 women with a primary histological diagnosis of cHSIL, 50 patients with residual/recurrent histological diagnosis of cHSIL treated with imiquimod and 50 patients with cHSIL (e.g. CIN 2) not treated to await potential spontaneous regression according to the real life setting.

INTERVENTION: Patients are included in the study if they prefer imiquimod treatment, as standard care, for their cHSIL lesion or choose for expectative management of cHSIL (e.g. CIN2), according to the real-life clinical setting in the Netherlands. Patients are treated by a 16-week regime of imiquimod 5% cream, applied three times a week. Treatment efficacy will be evaluated after 20 weeks, by colposcopy with diagnostic biopsies, and at 6 months after completion of imiquimod therapy with cytology or if indicated histology. At inclusion, at 20 weeks and after 6 months a vaginal swab will be taken to evaluate the vaginal microbiome. Therapy adherence and side effects will be registered.