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Home Drug Development Clinical Trials

Savolitinib completes enrolment for Phase II clinical trial in Papillary Renal Cell Carcinoma

Yuvraj_pawp by Yuvraj_pawp
24th October 2015
in Clinical Trials

Hutchison MediPharma Limited (“HMP”) today announces that it and AstraZeneca AB (publ) (“AstraZeneca”) have completed enrolment in a global Phase II study of savolitinib (AZD6094), a potent and highly selective mesenchymal epithelial transition factor (“c-Met”) inhibitor. This is a Phase II study to evaluate the efficacy and safety of savolitinib monotherapy (600 mg once daily) in papillary renal cell carcinoma (“PRCC”) in the United States, Canada and Europe. PRCC represents about 14% of all new cases of kidney cancer.

Savolitinib is a potential global first-in-class inhibitor of c-Met, receptor tyrosine kinase, an enzyme which exhibits aberrant behavior (e.g. gene amplification, over-expression and mutation) in many types of solid tumors. Savolitinib was developed as a potent and highly selective oral c-Met inhibitor that was designed to address renal toxicity, the primary issue that has to-date prevented other selective c-Met inhibitors from gaining regulatory approval. In Phase I/Ib clinical studies, savolitinib has shown promising signs of clinical efficacy, causing tumor size reduction, in c-Met aberrant patients in PRCC, non- small cell lung cancer, colorectal cancer and gastric cancer.

This Phase II study is an open-label, single-arm, multicenter study designed to evaluate the efficacy and safety of savolitinib in patients with locally advanced or metastatic PRCC. A total of 90 patients have been enrolled in 22 centers, making it the largest prospective clinical study in PRCC ever conducted. The primary objective of this study is to assess the anti-tumor activity of savolitinib in patients with PRCC, with secondary assessment objectives including progression free survival, duration of response, safety and tolerability and pharmacokinetics and pharmacodynamics. Importantly, tumor samples from each patient are concurrently being subjected to molecular analysis to determine c-Met status in order to better understand the relationship between c-Met aberration and clinical outcome.

The interim data of the Phase II trial is expected to be published at the American Society of Clinical Oncology meeting in 2016.

About the c-Met signal pathway

C-Met, which is also known as hepatocyte growth factor receptor, or HGFR, is a signaling pathway that has specific roles in normal mammalian growth and development. The aberrant activation of c-Met has been demonstrated to be highly correlated in many cancer indications, including kidney, lung, gastric, colorectal, esophageal and brain cancer and plays a major role in cancer pathogenesis including tumor growth, survival, invasions, metastasis, the suppression of cell death as well as tumor angiogenesis. To date, no selective c-Met inhibitors have received regulatory approval.

C-Met also plays a role in drug resistance in many tumor types. For instance, c-Met gene amplification has been found in non-small cell lung cancer and colorectal cancer following epidermal growth factor receptor inhibition treatment, leading to drug resistance. Furthermore, c-Met over-expression has been found to emerge in renal cell carcinoma following anti-VEGFR treatment.

About PRCC

In 2014, approximately 356,000 new cases of kidney cancer were observed globally, which is expected to grow to approximately 413,000 by 2020. Renal cell carcinoma accounted for approximately 87% of all new cases of kidney cancer globally, including approximately 263,000 new cases of clear cell renal cell carcinoma and approximately 48,000 new cases of PRCC.

No targeted therapies for PRCC have been approved and there are no standard first-line treatments specifically for metastatic PRCC. Anti-angiogenic drugs have shown limited activity against PRCC in retrospective studies, but very few prospective studies in pure papillary histology have been reported. In a retrospective study, investigators collect data from past records without conducting follow-up with patients, as is the case with a prospective study.

About savolitinib for PRCC and other indications

During the Australian Phase I study of savolitinib, positive outcomes among PRCC patients had a strong correlation to c-Met gene status. Three of eight PRCC patients treated achieved a partial response.

One of these patients has been on the drug for over 2 years and has had tumor measurement reduction of greater than 85%. A further three of these eight PRCC patients achieved stable disease. Importantly, the level of tumor response among these eight PRCC patients appeared to correlate with c-Met gene status.

Currently, we and AstraZeneca, our partners on savolitinib, are conducting nine clinical studies of savolitinib monotherapy treatment as well as savolitinib in combination treatments with other tyrosine kinase inhibitors and chemotherapy in kidney, lung and gastric cancers. Furthermore, by the end of 2015, we expect to initiate three further proof-of-concept studies for savolitinib, two of which will involve combinations with immunotherapies.

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