Amgen Presents New Data On Talimogene Laherparepvec As Single Agent And Combination Therapy In Metastatic Melanoma At ASCO

Source: Market Watch, June 2014

Phase 1 Study Evaluating Talimogene Laherparepvec Plus Ipilimumab Showed Tolerability at Doses AdministeredTumors Shrank in Size or Were No Longer Detectable in 56 Percent of PatientsPositive Overall Survival Trend Observed in Phase 3 Study

HOUSAND OAKS, Calif., June 2, 2014 /PRNewswire/ — Amgen¬† today announced new data from two key clinical trials that support the potential of talimogene laherparepvec, a novel, investigational oncolytic immunotherapy, as both a single agent and as part of a combination regimen in patients with metastatic melanoma. The findings were presented at the 50th Annual Meeting of the American Society of Clinical Oncology (ASCO) in Chicago.

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Data from the 19 patients in the Phase 1b combination study, presented for the first time at ASCO, showed no dose-limiting toxicities with talimogene laherparepvec in combination with ipilimumab (Abstract #9029). Additionally, tumors either shrank in size or were no longer detectable in 56 percent of patients when talimogene laherparepvec was given prior to and in combination with ipilimumab. The most common adverse events observed were chills, fevers, rash and fatigue.

“We are entering an era where new melanoma therapies are advancing clinical care for patients in ways not previously seen,” said Sean E. Harper, M.D., executive vice president of Research and Development at Amgen. “Talimogene laherparepvec has demonstrated the ability to produce durable and complete responses in patients with metastatic melanoma which provides a strong basis for a filing later this year and potential approval of talimogene laherparepvec as a novel treatment for this devastating disease.”

As previously reported, the pivotal Phase 3 trial met its primary endpoint showing a statistically significant improvement in durable response rate (16 percent in the talimogene laherparepvec arm versus two percent in the granulocyte-macrophage colony-stimulating factor [GM-CSF]). Among the 26 percent of patients who achieved an overall response (n=78) in the talimogene laherparepvec arm, 40 percent achieved a complete response (no evidence of disease). Data presented today showed that among the talimogene laherparepvec responders, there was a 65 percent probability of responses lasting for at least 12 months.

Detailed results of the overall survival analysis, a key secondary endpoint of the pivotal Phase 3 trial evaluating talimogene laherparepvec as a single agent, were also presented (Abstract #9008a). The results demonstrated a 4.4 month improvement in overall survival (HR=0.79; p=0.051) which closely approached statistical significance in the total patient population tested that included patients with and without visceral tumors (tumors involving solid organs such as the lungs and liver).The most frequent adverse events observed in this trial were fatigue, chills and pyrexia. The most common serious adverse events include disease progression, cellulitis and pyrexia.

“Novel investigational therapies are creating exciting momentum in melanoma research and our challenge is to better understand how to most appropriately develop these therapies,” said Igor Puzanov, M.D., associate professor of Medicine at Vanderbilt-Ingram Cancer Center and lead author on the Phase 1b combination study. “These latest findings support the potential of talimogene laherparepvec as a single agent and provide a strong rationale for further investigation as a combination therapy in a broad range of appropriate patients.”

Phase 1b/2 Trial Design The Phase 1b/2, multicenter, open-label trial enrolled patients with unresected Stage IIIB-IV melanoma (58 percent of patients were Stage IV), no prior systemic treatment, measurable disease, and more than one injectable cutaneous, subcutaneous or nodal lesion (n=19). Talimogene laherparepvec was administered by intratumoral injection on day 1 of week 1, day 1 of week 4, and then every two weeks thereafter. Ipilimumab was administered intravenously on day 1 of week 6, week 9, week 12, and week 15 for a total of four infusions. Patients were treated with talimogene laherparepvec until complete response, all injectable tumors disappeared, disease progression per a modified immune-related response criteria (irRC), or intolerance of study treatment.

Phase 3 Trial Design The Phase 3 pivotal trial was a global, randomized, open-label trial to evaluate the safety and efficacy of talimogene laherparepvec compared to a control therapy (GM-CSF) in over 400 patients with unresected stage IIIB, IIIC or IV melanoma. The primary endpoint was durable response rate defined as the rate of complete response or partial response lasting continuously for six or more months, as compared to control therapy. Overall survival was a secondary endpoint.

Patients were randomized 2:1 to receive either talimogene laherparepvec intralesionally every two weeks or GM-CSF subcutaneously for the first 14 days of each 28 day cycle. Treatment could last for up to 18 months. Where appropriate, stable or responding patients could receive additional treatment on an extension protocol.

Amgen Post-ASCO Summary Webcast Amgen will hold a post-ASCO summary webcast on Tuesday, June 3, 2014, at 1 p.m. PT. Sean E. Harper, M.D., executive vice president of Research and Development at Amgen, along with members of Amgen’s clinical development team will participate to discuss data presented at ASCO and Amgen’s broader oncology portfolio of products.

Live audio of the conference call will be simultaneously broadcast over the Internet and will be available to members of the news media, investors and the general public.

The webcast, as with other selected presentations regarding developments in Amgen’s business given by management at certain investor and medical conferences, can be found on Amgen’s website, , under Investors. Information regarding presentation times, webcast availability and webcast links are noted on Amgen’s Investor Relations Events Calendar. The webcast will be archived and available for replay for at least 90 days after the event.

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