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Promising signal for the AKT inhibitor ipatasertib: NCI-MATCH cancer trial

Published On 2022-10-28T09:00:40+05:30  |  Updated On 28 Oct 2022 11:19 AM GMT
Promising signal for the AKT inhibitor ipatasertib: NCI-MATCH cancer trial

Overview

Results from a single-arm phase 2 study of 32 patients with various cancer types harboring the rare AKT1 E17K mutation who received treatment with the oral AKT inhibitor ipatasertib in the NCI-MATCH precision medicine cancer trial are part of the 34th EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics in Barcelona, Spain. Arm Z1K of NCI-MATCH met its primary endpoint, with ipatasertib demonstrating clinically significant activity in patients, warranting additional studies.

The primary objective of each of the 39 arms in NCI-MATCH is to determine the proportion of patients who experience an objective response, including partial or complete. Under predefined criteria, an overall response rate greater than 16% in given arm signals that the therapy warrants further study.

Arm Z1K is the second NCI-MATCH arm to explore the clinical activity of an AKT inhibitor in patients with AKT1 E17K mutations. The final results of Arm Y show that capivasertib, another orally administered AKT inhibitor, had a clinically significant objective response rate of 28.6% with AKT1 E17K-mutated metastatic tumors.

Although the PI3K-AKT pathway is one of the most commonly altered pathways in cancer, mutations in AKT genes rarely occur. Of those that are reported, the majority are an AKT1 point mutation in the pleckstrin homology domain that replaces a glutamic acid with lysine at residue 17 (E17K). Studies of both tumors and cancer cell lines confirm a quantitative increase in activated AKT due to the E17K point mutation, and overall levels of pan-AKT antibodies appear to correlate with sensitivity to AKT inhibition

Among 32 evaluable patients, the histologies included breast (20), gynecologic (7), prostate (2), and other. It was a heavily pretreated population, with 27/32 patients having received three or more prior lines of treatment.

Patients received ipatasertib 400 mg orally once daily in 28-day cycles until progression or unacceptable toxicity. Tumor assessments were repeated every two cycles. The histologies among patients with a partial response are as follows: four cases of breast cancer (three HR+/HER2- and one HR+/HER2+), one endometrioid adenocarcinoma, one squamous cell of the anus, and one salivary gland cancer. The median duration of response was 8.5 months. There were no complete responses.

Median overall survival was 18 months. The estimated 6-month progression-free survival (PFS) rate was 44%.

Reference:

NCI-MATCH cancer trial finds a promising signal for the AKT inhibitor ipatasertib, (2022, October 27), MEETING 34th EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics, ECOG-ACRIN Cancer Research Group, https://ecog-acrin.org/press-release-nci-match-cancer-trial-finds-a-promising-signal-for-the-akt-inhibitor-ipatasertib/

Speakers

Isra Zaman

B.Sc Life Sciences, M.Sc Biotechnology, B.Ed

Isra Zaman is a Life Science graduate from Daulat Ram College, Delhi University, and a postgraduate in Biotechnology from Amity University. She has a flair for writing, and her roles at Medicaldialogues include that of a Sr. content writer and a medical correspondent. Her news pieces cover recent discoveries and updates from the health and medicine sector. She can be reached at editorial@medicaldialogues.in.
AKT inhibitor ipatasertib cancer cancer trial medicine cancer trial 
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