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AstraZeneca today presented detailed results from the Phase III CASPIAN trial, showing Imfinzi (durvalumab) significantly improved overall survival (OS) in patients with previously-untreated extensive-stage small cell lung cancer (SCLC).

Imfinzi in combination with four cycles of standard-of-care (SoC) chemotherapy (etoposide with either cisplatin or carboplatin) demonstrated a statistically-significant and clinically-meaningful improvement in OS vs. SoC consisting of up to six cycles of chemotherapy and optional prophylactic cranial irradiation (PCI).

The risk of death was reduced by 27% (equal to a hazard ratio of 0.73), with median OS of 13.0 months for Imfinzi plus chemotherapy vs. 10.3 months for SoC. Results showed a prolonged OS benefit with an estimated 33.9% of patients alive at 18 months following treatment with Imfinzi plus chemotherapy vs. 24.7% of patients following SoC.

Across all efficacy endpoints, benefits were observed in patients treated with Imfinzi plus chemotherapy vs. SoC. Results showed a significantly higher progression-free survival (PFS) rate at 12 months (17.5% vs. 4.7%), a 10.3% increase in confirmed objective response rate (ORR) (67.9% vs. 57.6%), and improved duration of response (DOR) at 12 months (22.7% vs. 6.3%).

The results were presented at the Presidential Symposium of the IASLC 2019 World Conference on Lung Cancer hosted by the International Association for the Study of Lung Cancer in Barcelona, Spain.

José Baselga, Executive Vice President, Oncology R&D said: "We are encouraged to see more than a third of small cell lung cancer patients treated with Imfinzi plus chemotherapy alive at the 18-month landmark, which is remarkable given the aggressive nature of the disease. It is also noteworthy that these results may enable physicians to choose Imfinzi in combination with either cisplatin or carboplatin chemotherapy backbones. We look forward to working with regulatory authorities to bring Imfinzi to patients with small cell lung cancer around the world as soon as possible."

Luis Paz-Ares, MD, Ph.D., Chair, Medical Oncology Department, Hospital Universitario Doce de Octubre, Madrid, Spain and principal investigator in the Phase III CASPIAN trial said: "Patients have had limited treatment options for small cell lung cancer, a devastating disease where the five-year survival rate has been as low as 6%. The significant survival benefit demonstrated with Imfinzi combined with only four cycles of a choice of chemotherapy compared to a robust control arm, provides evidence and hope of a new treatment option for these patients."

	EP + Imfinzii (n=268)	EPi (n=269)
OS (primary endpoint)ii
Number of deaths (%)	155 (57.8%)	181 (67.3%)
Hazard ratio (95% CI)	0.73 (0.591, 0.909)
p-value	0.0047
Median in months (95% CI)	13.0 (11.5, 14.8)	10.3 (9.3, 11.2)
OS rate (18 months)	33.9%	24.7%
PFS (secondary endpoint)ii,iii
Number (%) of patients with event	226 (84.3%)	233 (86.6%)
Hazard ratio (95% CI)	0.78 (0.645, 0.936)
Median in months (95% CI)	5.1 (4.7, 6.2)	5.4 (4.8, 6.2)
PFS rate (12 months)	17.5%	4.7%
ORR (secondary endpoint)ii,iv
Number (%) of patients with response	182 (67.9%)	155 (57.6%)
Odds ratio (95% CI)	1.56 (1.095, 2.218)
DOR at 12 months (secondary endpoint)	22.7%	6.3%

The safety and tolerability of Imfinzi in combination with SoC etoposide and platinum-based chemotherapy was consistent with previous trials. Results showed that 61.5% of patients experienced a Grade 3 or 4 AE with Imfinzi plus SoC (all causes) vs. 62.4% with SoC, and patients discontinuing treatment due to AEs were similar between arms (9.4% vs. 9.4%).

Imfinzi is approved in the curative-intent setting of unresectable, Stage III non-small cell lung cancer after chemoradiotherapy in 49 countries, including the US, Japan and across the EU, based on the Phase III PACIFIC trial.

The CASPIAN trial is a randomised, open-label, multi-centre, global, Phase III trial in the 1st-line treatment of patients with extensive-stage SCLC. The trial compared Imfinzi in combination with etoposide and either cisplatin or carboplatin chemotherapy, or Imfinzi, tremelimumab and chemotherapy vs. chemotherapy alone. In the experimental arms, patients were treated with up to four cycles of chemotherapy. In comparison, the control arm allowed up to six cycles of chemotherapy and optional PCI. The trial will continue to the final analysis of OS for the combination of Imfinzi, tremelimumab and chemotherapy.

The trial is being conducted in more than 200 centres across 22 countries, including in the US, Europe, South America, Asia and the Middle East. The primary endpoint is OS.

Lung cancer is the leading cause of cancer death among both men and women and accounts for about one-fifth of all cancer deaths.2 Lung cancer is broadly split into NSCLC and SCLC, with about 15% classified as SCLC.3 About three quarters of SCLC patients are diagnosed with extensive-stage disease, in which the cancer has spread widely through the lung or to other parts of the body. Prognosis is particularly poor, as only 6% of all SCLC patients will be alive five years after diagnosis.4

Imfinzi (durvalumab) is a human monoclonal antibody that binds to PD-L1 and blocks the interaction of PD-L1 with PD-1 and CD80, countering the tumour's immune-evading tactics and releasing the inhibition of immune responses.

As part of a broad development programme, Imfinzi is also being tested as a monotherapy and in combination with tremelimumab, an anti-CTLA4 monoclonal antibody and potential new medicine, as a treatment for patients with NSCLC, small cell lung cancer, bladder cancer, head and neck cancer, liver cancer, cervical cancer, biliary tract cancer and other solid tumours.

AstraZeneca has a comprehensive portfolio of approved and potential new medicines in late-stage clinical development for the treatment of different forms of lung cancer spanning several stages of disease, lines of therapy and modes of action. We aim to address the unmet needs of patients with EGFR-mutated tumours as a genetic driver of disease, which occur in 10-15% of NSCLC patients in the US and EU and 30-40% of NSCLC patients in Asia, with our approved medicines Iressa (gefitinib) and Tagrisso (osimertinib), and ongoing Phase III trials ADAURA, LAURA, FLAURA and FLAURA2 as well as the Phase II combination trials SAVANNAH and ORCHARD.5-7

Our extensive late-stage Immuno-Oncology programme focuses on lung cancer patients without a targetable genetic mutation which represents approximately three-quarters of all patients with lung cancer.8 Imfinzi (durvalumab), an anti-PDL1 antibody, is in development for patients with advanced disease (Phase III trials POSEIDON, PEARL, and CASPIAN) and for patients in earlier stages of disease including potentially-curative settings (Phase III trials AEGEAN, PACIFIC-2, ADRIATIC, ADJUVANT BR.31, PACIFIC-4, and PACIFIC-5) both as monotherapy and in combination with tremelimumab and/or chemotherapy.

IO is a therapeutic approach designed to stimulate the body's immune system to attack tumours. Our IO portfolio is anchored by immunotherapies that have been designed to overcome anti-tumour immune suppression. We believe that IO-based therapies offer the potential for life-changing cancer treatments for the clear majority of patients.

We are pursuing a comprehensive clinical-trial programme that includes Imfinzi (anti-PDL1) as monotherapy and in combination with tremelimumab (anti-CTLA4) in multiple tumour types, stages of disease, and lines of therapy, using the PD-L1 biomarker as a decision-making tool to define the best potential treatment path for a patient. In addition, the ability to combine our IO portfolio with radiation, chemotherapy, small targeted molecules from across our Oncology pipeline, and from our research partners, may provide new treatment options across a broad range of tumours.

AstraZeneca has a deep-rooted heritage in oncology and offers a quickly-growing portfolio of new medicines that has the potential to transform patients' lives and the Company's future. With at least six new medicines to be launched between 2014 and 2020, and a broad pipeline of small molecules and biologics in development, the Company is committed to advance oncology as a key growth driver for AstraZeneca focused on lung, ovarian, breast and blood cancers. In addition to AstraZeneca's main capabilities, the Company is actively pursuing innovative partnerships and investments that accelerate the delivery of our strategy, as illustrated by the investment in Acerta Pharma in haematology.

By harnessing the power of four scientific platforms - Immuno-Oncology, Tumour Drivers and Resistance, DNA Damage Response and Antibody Drug Conjugates - and by championing the development of personalised combinations, AstraZeneca has the vision to redefine cancer treatment and, one day, eliminate cancer as a cause of death.

AstraZeneca is a global, science-led biopharmaceutical company that focuses on the discovery, development and commercialisation of prescription medicines, primarily for the treatment of diseases in three therapy areas - Oncology, CVRM and Respiratory. AstraZeneca operates in over 100 countries and its innovative medicines are used by millions of patients worldwide. For more information, please visit astrazeneca.com and follow us on Twitter @AstraZeneca.

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1. Kalemkerian GP, et al. Treatment Options for Relapsed Small-Cell Lung Cancer: What Progress Have We Made? Journal of Oncology Practice, volume 14, issue no. 6 (June 1, 2018) 369-370.

2. World Health Organization. International Agency for Research on Cancer. Available at http://globocan.iarc.fr/Pages/fact_sheets_population.aspx. Accessed May 2019.

3. LUNGevity Foundation. Types of Lung Cancer. Available at https://lungevity.org/for-patients-caregivers/lung-cancer-101/types-of-lung-cancer. Accessed May 2019.

5. Szumera-Ciećkiewicz A, et al. EGFR Mutation Testing on Cytological and Histological Samples in Non-Small Cell Lung Cancer: a Polish, Single Institution Study and Systematic Review of European Incidence. Int J Clin Exp Pathol. 2013:6;2800-12. Accessed July 2019.

6. Keedy VL, et al. American Society of Clinical Oncology Provisional Clinical Opinion: Epidermal Growth Factor Receptor (EGFR) Mutation Testing for Patients with Advanced Non-Small-Cell Lung Cancer Considering First-Line EGFR Tyrosine Kinase Inhibitor Therapy. J Clin Oncol. 2011:29;2121-27. Accessed July 2019.

7. Ellison G, et al. EGFR Mutation Testing in Lung Cancer: a Review of Available Methods and Their Use for Analysis of Tumour Tissue and Cytology Samples. J Clin Pathol. 2013:66;79-89. Accessed July 2019.

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	By: /s/ Adrian Kemp
	Name: Adrian Kemp
	Title: Company Secretary