Amgen's Investigational KRAS G12C Inhibitor Sotorasib Demonstrated Rapid, Deep And Durable Responses In Previously Treated Patients With Advanced Non-Small Cell Lung Cancer
Sotorasib demonstrated a confirmed objective response rate (ORR) and disease control rate (DCR) of 37.1% and 80.6%, respectively, and a median duration of response of 10 months (data cutoff of Dec.1, 2020; median follow-up time was 12.2 months). The results also highlighted that sotorasib is the first KRASG12C inhibitor to show progression-free survival (median of 6.8 months) in a Phase 2 study, which is consistent with earlier Phase 1 results in previously treated patients with KRAS G12C-mutated advanced NSCLC.
Patients were treated with sotorasib 960 mg once daily orally. Prior to the trial, 81% of patients had progressed on both platinum-based chemotherapy and PD1/L1 inhibitors, with the remainder progressing after having received one of these therapies.
"Patients with advanced non-small cell lung cancer who have failed first-line treatment face extremely poor outcomes with limited treatment options available to them, and
Over 80% of patients achieved disease control, including three complete responses and 43 partial responses, and the median best tumor shrinkage among all responders (n=46) was 60%. The median time to objective response was 1.4 months. Sotorasib had a favorable benefit-risk profile with most treatment-related adverse events (TRAEs) mild-to-moderate (grade 1 or 2) and no treatment-related deaths. Grade 3 TRAEs were reported in 25 (19.8%) patients and only one patient (0.8%) reported a Grade 4 TRAE. The most frequently reported TRAEs (any grade) were diarrhea (31.0%), nausea (19.0%), increased alanine aminotransferase (15.1%) and increased aspartate aminotransferase (15.1%). TRAEs led to treatment discontinuation in only 7.1% of patients.
"These results are encouraging and clinically meaningful for patients with advanced NSCLC harboring the KRAS G12C mutation," said
In exploratory analyses, encouraging tumor response to sotorasib was observed across a range of biomarker subgroups, including patients with negative or low PD-L1 expression level and those with STK11 mutation. This co-mutation has been associated with poor outcomes in NSCLC patients treated with checkpoint inhibitors and chemotherapy.
"Despite recent treatment advances, survival outcomes remain poor for patients with advanced stage non-small cell lung cancer on second and third-line therapies with the KRAS G12C mutation. Currently there are no targeted treatment options for them, and I am excited about the advances that
Following recent regulatory submissions in the
NSCLC accounts for 80%-85% of all lung cancers, and most patients (66%) have advanced or metastatic disease at initial diagnosis.1,2 KRAS G12C is one of the most common driver mutations in NSCLC and there is a high unmet need and poor outcomes associated in the second-line treatment of KRAS G12C driven NSCLC.3 In the
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Sotorasib has demonstrated a positive benefit-risk profile with fast, deep and durable anticancer activity in patients with NSCLC harboring the KRAS G12C mutation with a once daily oral formulation. Promising responses have also been observed in multiple other solid tumors.8
The CodeBreaK clinical development program for Amgen's investigational drug sotorasib is designed to treat patients with an advanced solid tumor with the KRAS G12C mutation and address the longstanding unmet medical need for these cancers.
CodeBreaK 100, the Phase 1 and 2, first-in-human, open-label multicenter study, enrolled patients with KRAS G12C-mutant solid tumors. Eligible patients must have received a prior line of systemic anticancer therapy, consistent with their tumor type and stage of disease. The primary endpoint for the Phase 2 study was centrally assessed objective response rate. The Phase 2 trial in NSCLC enrolled 126 patients, 124 of whom had centrally evaluable lesions by RECIST at baseline. The Phase 2 trial in colorectal cancer (CRC) is fully enrolled and topline results are expected in 2021.
A global Phase 3 randomized active-controlled study comparing sotorasib to docetaxel in patients with KRAS G12C-mutated NSCLC (CodeBreaK 200) is currently recruiting. Amgen also has more than 10 Phase 1b combination studies across various advanced solid tumors (CodeBreaK 101) open for enrollment.
For information, please visit www.codebreaktrials.com.
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1 American Cancer Society. https://www.cancer.org/cancer/lung-cancer/about/what-is.html. Accessed
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