Cited by 31Lung Cancer Treatments and MutationsLung Cancer Research StudiesLung Cancer Diagnosis and Treatment

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Exceptional responders with invasive mucinous adenocarcinomas: a phase 2 trial of bortezomib in patients with KRAS G12D-mutant lung cancers

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Abstract

KRAS G12D-mutant/p53-deficient non-small-cell lung cancer (NSCLC) models are dependent on the NF-κB pathway that can be down-regulated by the proteasome inhibitor bortezomib. Two exceptional responders were observed on prior clinical trials of bortezomib, both of whom had KRAS G12D-mutant NSCLC, prompting the initiation of this single-center phase 2 trial. Patients with advanced KRAS G12D-mutant NSCLC were eligible. Bortezomib was administered at 1.3 mg/m 2 subcutaneously (days 1, 4, 8, 11; 21-d cycle) until progression or unacceptable toxicity. The primary objective was best objective response (RECIST v1.1). Sixteen patients with KRAS G12D-mutant lung adenocarcinomas were treated. Patients had a median pack year smoking history of 4 (range 0–45). A partial response (PR) was observed in one patient (−66% from baseline) and stable disease in five patients on the first stage of this study (overall response rate of 6%, 95% CI: 0.2–30.2), and further patients were not accrued. The median progression-free survival was 1 mo (95% CI: 1–6). The median overall survival was 13 mo (95% CI: 6–NA). The most common treatment-related adverse events were fatigue (38%) and diarrhea (26%). TP53 status did not predict response on exploratory testing. Of note, the patient with a PR had a unique subtype of lung adenocarcinoma—invasive mucinous adenocarcinomas (IMA)—and had rapid clinical improvement and substantial disease regression, which was also previously observed in two other patients with advanced KRAS G12D-mutant lung cancer with IMAs who received bortezomib on separate clinical trials. Exceptional responses to bortezomib can be achieved in KRAS G12D-mutant NSCLCs. KRAS G12D mutation alone, however, is not a robust predictor of response. Further evaluation should only be performed after further elucidation of other factors such as co-occurring alterations and histologic subtype such as IMA that may predict sensitivity to therapy.

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Authors
Drilon, A., Schoenfeld, A. J., Arbour, K. C., Litvak, A., Ni, A., Montecalvo, J., Yu, H. A., Panora, E., Ahn, L., Kennedy, M., Haughney-Siller, A., Miller, V., Ginsberg, M., Ladanyi, M., Arcila, M., Rekhtman, N., Kris, M. G., & Riely, G. J.
Affiliations
Memorial Sloan Kettering Cancer Center (US)
Venue
Molecular Case Studies
Published
2019-04
Volume
5
Issue
2
Pages
a003665
ISSN
  • 2373-2865 (ISSN-L)
  • 2373-2873
OpenAlex
W2931064118
Cited by
31
References
17
Citations by year
2026: 2 · 2025: 2 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 6 · 2020: 5 · 2019: 2
Type
posted content
Language
en
Open access
Licence
cc-by-nc
Locations
  • Molecular Case Studies (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
  • American Society of Clinical Oncology
  • National Cancer Institute (P30 P30CA008748, P30CA008748)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
  • Health Sciences › Medicine › Oncology › Lung Cancer Research Studies
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Diagnosis and Treatment
Keywords
KRAS G12D mutation, non-small cell lung cancer, lung adenocarcinoma, invasive mucinous adenocarcinoma, proteasome inhibitors, NF-κB signaling, p53 deficiency, exceptional responders, treatment response prediction, histological subtypes
MeSH terms
Bortezomib, Adult, Aged, Aged, 80 and over, Antineoplastic Agents, Adenocarcinoma, Mucinous, Carcinoma, Non-Small-Cell Lung, Female, Humans, Injections, Subcutaneous, Lung Neoplasms, Male, Middle Aged, Mutation, Prospective Studies, Proto-Oncogene Proteins p21(ras), Treatment Outcome

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