About the Pivotal Phase II Trial (ERIVANCE BCC/SHH4476g)
ERIVANCE BCC is an international, single-arm, multicenter, two-cohort, open-label Phase II study that enrolled 104 patients with advanced BCC, including locally advanced BCC (71) and metastatic BCC (33). Locally advanced BCC includes patients whose BCC lesions are deemed inoperable or for whom surgery is deemed inappropriate. Metastatic BCC is defined as BCC that had spread to other parts of the body, including the lymph nodes, lung, bones and/or internal organs. The study was conducted at 31 sites in the United States, Australia and Europe. Study participants received 150 mg vismodegib orally, once daily until disease progression or intolerable toxicity. Tumor responses for metastatic BCC were measured by RECIST criteria and for locally advanced BCC by a novel composite endpoint which included reduction of size of lesions of at least 30% in longest dimension and/or complete resolution of locally advanced BCC ulceration.
The primary endpoint of the study is overall response rate as assessed by an independent review facility, with secondary endpoints including investigator-assessed overall response rate, progression-free survival (PFS), overall survival (OS), and duration of response in all evaluable patients, including locally advanced BCC or metastatic BCC patients. In addition, absence of residual BCC in patients was assessed by sampling biopsies in patients with locally advanced BCC.
The overall response rate in the pivotal Phase II trial as assessed by an independent review facility showed vismodegib substantially shrank tumors or healed visible lesions in 43 percent of patients in the locally advanced cohort and 30 percent of patients in the metastatic BCC cohort.The median duration of progression-free survival (PFS) by independent review for both metastatic BCC and locally advanced BCC patients was 9.5 months. The median duration of response by independent review was 7.6 months for both metastatic BCC and locally advanced BCC patients. The median duration of response as assessed by study investigators was 12.9 and 7.6 months for metastatic BCC and locally advanced BCC patients, respectively.
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