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Clinical Trial Summary

This trial will investigate the addition of an antibody (Ipilimumab) to conventional Carboplatin and Etoposide chemotherapy in extensive stage small cell lung cancer.

The primary objective is to establish the progression free survival at 1 year.


Clinical Trial Description

A Phase II trial of the addition of Ipilimumab to Carboplatin and Etoposide chemotherapy for the first line treatment of extensive stage small cell lung cancer (ICE)

Indication:

Extensive Stage Small cell lung cancer

Primary Objective:

To establish the progression free survival at 1 year in patients with extensive stage small cell lung cancer treated with ipilimumab, carboplatin and etoposide.

Secondary Objective:

To assess the response to and toxicity of the combination of ipilimumab with carboplatin and etoposide chemotherapy.

Immunological Objectives:

1. To examine whether ipilimumab stimulates a humoral immune response to onco-neuronal self-antigens

The results from the above measurement of antibodies against onco-neuronal antigens will be used to focus the cellular biomarker analysis and identify targets to assess cellular responses:

2. To measure the effect of ipilimumab on CD8+ T-cells directed against onco-neuronal antigens, presumed to be responsible for the desired cytotoxic activity against cancer cells.

3. To evaluate the immune response to non-neuronal antigens in the presence of ipilimumab.

Rationale:

Small cell lung cancer accounts for around 20% of all lung cancer presentation in the UK. Of these approximately half present with extensive disease, overall representing 4000 new cases annually. Although initial response to chemotherapy for this group of patients ranges from 50-60% 1, 2, subsequent relapse is inevitable and results in poor survival with only 5% of patients alive at 2 years from diagnosis.

Despite attempts to improve on conventional chemotherapy with platinum and etoposide in extensive stage small cell lung cancer, neither modification of conventional chemotherapeutic drugs, nor the use of novel targeted therapy has shown an increased benefit. A conceptual change in therapeutic strategy is therefore required, and immunotherapy is an attractive avenue to pursue.

Anti-CTLA4 antibody may allow the development or induction of anti-tumour immunity even in the absence of a known tumour antigen and without active anti-tumour vaccination. Chemotherapy effectively kills tumour cells and releases tumour derived antigens and as such administration of anti-CTL4 antibody may induce a clinically useful anti-tumour immune response against these antigens.

This trial will therefore investigate the addition of the anti-CTLA4 antibody ipilimumab to conventional carboplatin and etoposide chemotherapy in extensive stage small cell lung cancer.

Trial Design:

Single stage non-randomised phase II trial

Sample size:

Patients will be recruited so that 40 patients are treated with chemo-immunotherapy. If 8 or more patients are progression free at 1 year the treatment will be considered to be successful and warrant further testing.

Study Population:

All patients consented will form the ITT population.

• Patients who have received at least 1 dose of Ipilimumab will form the analysis population (N=40).

Dosage Regimen/Duration of Treatment:

Subjects will receive up to 6 cycles of carboplatin and etoposide chemotherapy according to response and toxicity. Carboplatin will be administered at a dose of AUC = 6 (calculated according to the Calvert formula using a Cockcroft and Gault calculation of creatinine clearance) IV, day 1.

Etoposide will be administered at 120mg/m2 IV day 1, 100mg BD PO days 2 and 3. Both chemotherapy drugs will be delivered as a 21 day cycle (q21) with up to a maximum of 6 cycles delivered according to response unless progressive disease (RECIST) and or excessive toxicity.

Ipilimumab will be administered at a dose of 10mg/kg IV on day 1 of cycles 3-6 of chemotherapy.

In the absence of immune related progression of disease or unacceptable toxicity, subsequent maintenance doses of ipilimumab will be delivered every 12 weeks starting at week 30 at a dose of 10 mg/kg until unacceptable toxicity or immune related disease progression.

Tumour assessments:

Tumour assessments by CT scanning of the chest, abdomen and pelvis will be performed at baseline and the following time points until progression:

Weeks 6, 12, 18, 24, 30, 36, 42, 48, 52 and then 12 weekly until progression by both RECIST and immune related response criteria.

Duration of study:

It is expected that with the current standard of care the trial will take 24 months to recruit with completion of the trial anticipated in 3 years. The study may however continue for longer if patients are continuing to receive maintenance ipilimumab, in which case the study will finish 100 days after the last dose of ipilimumab (when it is clear the last dose has been given) or when all patients have died.

Safety monitoring:

Given the different safety profile of ipilimumab and carboplatin / etoposide chemotherapy, no overlapping toxicity is expected.

However, throughout the trial, there will be a close monitoring of the nature and the severity of the adverse events reported on an on-going basis.

A planned interim safety monitoring assessment will be performed. Once 9 patients have been treated with the combination for at least 6 weeks (subjects who discontinued treatment earlier due to excessive toxicity of chemo-immunotherapy will also be considered), a first clinical safety assessment will be performed to identify any early safety signals from ipilimumab given in combination with carboplatin and etoposide.

In addition a review of safety may be triggered throughout the trial:

If greater than or equal to 40% of subjects treated develop a greater than or equal to Grade 3 toxicity thought to be related to the study drugs; or If greater than or equal to 10% of subjects experience an unexpected ipilimumab-related greater than or equal to Grade 3 toxicity that cannot be alleviated or controlled by appropriate care and/or steroid and/or infliximab therapy within 14 days of the initiation of such therapy.

In response to any ipilimumab-related deaths unless attributed to disease progression.

In these circumstances the data will be carefully reviewed to determine the appropriate course of action, which could include:

Continue without modification; Continue with modifications of the study protocol. Modifications may include, but are not limited to, changes in inclusion/exclusion criteria, frequency of safety monitoring, change in ipilimumab dose, and alterations in study procedures; Discontinue the study (with provisions for orderly discontinuation in accordance with good medical practice) under extreme circumstances (eg, insufficient benefit-to-risk effect of the experimental treatment).

The decision to put patient accrual on hold while reviewing safety data will be taken or not, based on characteristics of the serious adverse events reported on an ongoing basis.

The review will take into account the known toxicity profile for ipilimumab and for carboplatin/etoposide, and the potential association of immune-related Adverse Events (irAEs) with clinical efficacy. ;


Study Design

Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment


Related Conditions & MeSH terms


NCT number NCT01331525
Study type Interventional
Source University Hospital Southampton NHS Foundation Trust.
Contact
Status Completed
Phase Phase 2
Start date June 2011
Completion date June 2015

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