HMP and AstraZeneca Present Savolitinib Papillary Renal Cell Carcinoma Phase II Results at 2017 Genitourinary Cancers Symposium

Shanghai: Tuesday, February 14, 2017: Hutchison MediPharma Limited (“HMP”) and AstraZeneca PLC (“AstraZeneca”) will present data from the ongoing Phase II clinical trial of savolitinib in patients with papillary renal cell carcinoma (“PRCC”) at the 2017 Genitourinary Cancers Symposium sponsored by the American Society of Clinical Oncology (“ASCO-GU”), to be held in Orlando, Florida from February 16 to 18, 2017.  Savolitinib, a highly selective inhibitor of c-Met receptor tyrosine kinase, has shown early clinical benefit in multiple Phase I and II studies in a number of cancers.  It was developed as a potent and highly selective oral inhibitor specifically designed to address issues observed in the clinic with first-generation c-Met inhibitors, including renal toxicity.

PRCC, the second most common histologic subtype of renal cell carcinoma (“RCC”), is associated with alterations in the c-Met gene (e.g. mutations, amplifications, and/or chromosomal changes).  Therapies that are currently available for RCC patients have demonstrated only modest benefit in PRCC and there are no therapies specifically approved for the treatment of c-Met-driven PRCC.  National Comprehensive Cancer Network guidelines recommend enrolling patients in clinical trials for first-line systemic therapy.

“There is a clear unmet medical need in PRCC,” said Toni Choueiri, Director of the Lank Center for Genitourinary Oncology, Dana-Farber Cancer Institute.  “The dataset from this Phase II study is compelling, with a very clear efficacy signal in MET-driven patients and an encouraging long duration of response, while remaining very well tolerated.”  He added, “These results support the initiation of the pivotal Phase III trial in a selected population of MET-driven PRCC.  This innovative patient selection approach would be the first ever molecularly selected trial in renal cell carcinoma.”

“We are delighted to report this highly encouraging progression-free survival data in Met-driven papillary renal cell carcinoma, a disease with no approved treatment options,” said Christian Hogg, Chief Executive Officer of Chi-Med.  “With development of the companion diagnostic assay to screen Met-driven disease now also complete we are preparing for the initiation of our global Phase III study, the first global registration trial for savolitinib.”

The current Phase II trial is the largest prospective clinical study ever conducted in PRCC patients.  It is a global single arm study of savolitinib in 109 patients with locally advanced or metastatic PRCC and was initiated in May 2014.  It is being conducted in 22 clinical centers in the US, Canada, UK, and Spain, and completed enrollment in October 2015.  Additional details about this study may be found at clinicaltrials.gov, using identifier NCT02127710.  The most recent results of the study will be presented in detail as follows:

Presentation Title:  

A Single-Arm Biomarker-Based Phase II Trial of Savolitinib in Patients with Advanced Papillary Renal Cell Cancer

 

Authors:  

 

Toni K. Choueiri, Elizabeth Plimack, Hendrik-Tobias Arkenau, Eric Jonasch, Daniel Y. C. Heng, Thomas Powles, Melanie M. Frigault, Edwin Clark, Amir Handzel, Humphrey Gardner, Shethah Morgan, Laurence Albiges, Sumanta Kumar Pal

 

Abstract No:  

436

 

Session:  

Session C: Penile, Urethral, and Testicular Cancers; Renal Cell Cancer

 

Date & Time:  

Saturday, February 18, 2017, 7:00 AM-7:55 AM and 11:30 AM-1:00 PM (EST)

 

Once presented, the presentation will be available.  Further information about ASCO-GU is available at gucasym.org.

HMP and AstraZeneca are currently initiating a global pivotal Phase III trial, the first pivotal study ever conducted in c-Met-driven PRCC and the first molecularly selected trial in RCC.

Over the course of 2017, HMP and AstraZeneca are also conducting a comprehensive molecular epidemiology study of approximately 300 PRCC patient samples to further understand the correlations between c-Met alterations and patient outcomes, including any predictive biomarkers.

ABSTRACT

A single-arm biomarker-based phase II trial of savolitinib in patients with advanced papillary renal cell cancer (PRCC)

Toni K. Choueiri1, Elizabeth Plimack2, Hendrik-Tobias Arkenau3, Eric Jonasch4, Daniel Y. C. Heng5, Thomas Powles6, Melanie M. Frigault7, Edwin Clark7, Amir Handzel7, Humphrey Gardner7, Shethah Morgan8, Laurence Albiges9, Sumanta Kumar Pal10

 

1Dana-Farber Cancer Institute, Boston, US 2Fox Chase Cancer Center, Philadelphia, US 3Sarah Cannon Research Institute, London, UK 4MD Anderson Cancer Centre, Houston, US 5Tom Baker Cancer Center, Calgary, Canada  6Barts Cancer Institute, London, UK  7AstraZeneca, Waltham, US, 8AstraZeneca, Cambridge, UK 9Institute Gustave Roussy, Paris, France 10City of Hope, Duarte, US

Background: Savolitinib (HMPL-504/Volitinib, AZD6094) is a potent, selective mesenchymal epithelial transition (“MET”) inhibitor (IC50 of 4 nM).  MET and its ligand, hepatocyte growth factor (“HGF”), are known to play an important role in the molecular events underlying oncogenesis in PRCC, a disease without a clear standard of care and marked by alterations of chromosome 7 (containing both MET and HGF genes) in a majority of patients as well as gene amplification or MET kinase domain mutations (Albiges et al 2014, Linehan et al, 2015).

Methods: This study evaluates savolitinib in PRCC patients dosed at 600 mg daily until disease progression.  Objective Response Rate (“ORR”) is the primary endpoint.  Progression-Free Survival (“PFS”) & Duration of Response are secondary endpoints.  Patient Reported Outcome (“PRO”) and Health-Related Quality of Life (“HRQoL”) questionnaires are exploratory endpoints.  Eligibility includes naïve and previously treated metastatic PRCC, ECOG PS 0 or 1.  Archival tumor was used to centrally confirm PRCC pathology post hoc and to determine MET status using Next Generation Sequencing (Foundation Medicine Inc, US).

Results: As of 27 June 2016, 109 patients were dosed.  Best response was PR n=8, SD n=43, PD n=48 & 10 patients were not evaluable for response.  44 patients are MET-driven (MET/HGF gene copy number gain or kinase domain mutations), 46 patients were MET-negative, 19 patients are status unknown.  MET-driven pts included Papillary Type I & II histologies.  All 8 responders were in the MET-driven group, 18% ORR in this subset.  Median PFS in the MET-driven group was 6.2 months (95% CI: 4.1–7.0) vs.  1.4 months (95% CI: 1.4–2.7) in the MET-negative group (p=0.002).  Overall 10/109 patients had adverse events (“AEs”) leading to discontinuation.  23/109 patients had ≥ Grade 3 toxicity related to savolitinib.  The most common AEs (all grades) includes: nausea (39%), fatigue (27%), edema (18%) and abnormal liver function tests (LFTs) (17%).  One death from hepatic encephalopathy was considered related to savolitinib.  PRO & HRQoL data was not statistically analyzed, descriptive data support main efficacy findings.

Conclusions: In the largest biomarker-profiled trial dedicated to PRCC, savolitinib was generally well tolerated with anti-tumor activity in MET-driven patients.  These findings warrant further clinical investigation of savolitinib in MET-driven PRCC.

About the Unmet Medical Need in c-Met-Driven PRCC Patients

Worldwide, about 366,000 new patients are diagnosed with kidney cancer annually, and the total market for kidney cancer treatments is expected to reach US$4.5 billion in 2020, according to Frost & Sullivan.  RCC accounts for approximately 80-85% of kidney cancer and has several histological sub-types with different genetic and biochemical characteristics.  Among these histologic variants of RCC, clear cell RCC (“ccRCC”) is the most common, accounting for 75-80% of RCC.

PRCC is the most common of the non-clear cell renal carcinomas accounting for 10-15% of RCC.  The proportion of PRCC patients whose tumors are c-Met-driven has historically been estimated at 40-70%.  In the largest study to date, presented at the annual meeting of the American Association for Cancer Research 2014, analysis of 220 frozen tumor samples catalogued in the French RCC Network indicated that 55-60% of PRCC patients showed gains in Chromosome 7 (i.e.  c-Met amplification).

The biology and molecular characteristics of PRCC are different from those of ccRCC.  This results in significantly worse prognosis and treatment outcomes for patients with PRCC when compared to patients with ccRCC.  Highlighting the unmet need is the fact that, although there are several drugs approved for use in RCC (the latest being approved in April 2016), these approvals were generally on the basis of studies conducted with a preponderance of ccRCC patients.  The need for different agents and more specific data tailored to the PRCC disease setting has been identified as a critical gap in the care of these patients.