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M.L. Spiegel
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MINI 03 - PD1 Axis Inhibition and EGFR (ID 101)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:L. Gandhi, Y. Ohe
- Coordinates: 9/07/2015, 16:45 - 18:15, Four Seasons Ballroom F1+F2
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MINI03.01 - Prior TKI Therapy in NSCLC EGFR Mutant Patients Associates with Lack of Response to Anti-PD-1 Treatment (ID 2172)
16:45 - 16:50 | Author(s): M.L. Spiegel
- Abstract
- Presentation
Background:
Programmed cell death-1 (PD-1) inhibitors have shown significant potential to induce durable responses in non-small cell lung cancer (NSCLC). Although responses have been seen in patients (pts) whose tumors harbor epidermal growth factor receptor (EGFR) mutations (EGFRm), data to date with inhibitors of PD-1, or its ligand PD-L1, suggest that responses are less frequent in EGFRm NSCLC. Studies in which EGFRm pts receive EGFR tyrosine kinase inhibitors (TKIs) and PD-1 inhibitors in sequence or concurrently are being conducted. However, based on the high response rate with EGFR TKIs in EGFRm pts, PD-1 inhibition does not precede the EGFR TKIs in these study designs.
Methods:
We evaluated data from our experience at UCLA as part of the KEYNOTE-001 clinical trial, in which pts received pembrolizumab 2 mg/kg every 3 weeks or 10 mg/kg every 2 or 3 weeks. Early in the trial, an amendment excluded EGFRm, EGFR TKI naïve pts, however a subsequent amendment allowed such pts if their mutation was non-sensitizing to approved EGFR TKIs. Although the trial employed central radiographic assessment by RECIST v1.1 (available to the sponsor but not the sites), clinical decisions and the assessment we describe were based on investigator-assessed immune-related response criteria. Groups were compared using Fisher’s exact test. Western blot was performed using standard techniques, exposing human non-small cell lung cancer cell lines HCC-827, H1975, Calu3 and H460 to erlotinib or afatinib at 1µM or control using the antibody PD-L1 mAb #1368 (Cell Signaling) and α-tubulin antibody #2144 (Cell Signaling).
Results:
We enrolled 29 EGFRm pts. 2 of 3 EGFR TKI naïve pts experienced a partial response (PR) compared to 1 of 26 enrolled after a prior EGFR TKI (p<0.001). 18 of these 29 pts had a 9 week scan. Of these, PR was seen in both EGFR TKI naïve pts (one L858R mutation and one exon 20 insertion) compared to 1 of 16 enrolled after a prior EGFR TKI (p<0.001). Of note, a similar trend of increased responses in EGFR TKI naïve pts was not seen in EGFR wild type pts. In vitro experiments using erlotinib and afatinib showed unchanged PD-L1 levels in cell lines not inhibited by the EGFR TKI used, but reduced PD-L1 in EGFRm cell lines inhibited by the TKI. Of note, the only responder among the EGFR TKI-treated EGFRm pts was one of only 4 of the 16 scanned post-TKI pts who had a non-sensitizing mutation. So, 0 of 22 EGFRm pts with a sensitizing mutation responded after an EGFR TKI.
Conclusion:
A retrospective analysis in EGFRm NSCLC showed a strong correlation between response and lack of prior EGFR TKI treatment. PD-L1 levels decrease in response to an EGFR TKI in cell lines sensitive to the TKI. Immunohistochemistry evaluating the presence and location of relevant proteins and immune effector cells are ongoing as is whole exome sequencing. These results have implications for the design of clinical trials of PD-1 inhibitors in EGFRm pts. Supported by: 1K23CA149079, One Ball Matt Memorial Golf Tournament, Kasdan Family
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P3.01 - Poster Session/ Treatment of Advanced Diseases – NSCLC (ID 208)
- Event: WCLC 2015
- Type: Poster
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 9/09/2015, 09:30 - 17:00, Exhibit Hall (Hall B+C)
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P3.01-087 - A Phase I Study of Exemestane with Carboplatin and Pemetrexed in Postmenopausal Women with Metastatic, Non-Squamous Non-Small Cell Lung Cancer (ID 2171)
09:30 - 09:30 | Author(s): M.L. Spiegel
- Abstract
Background:
Lung cancer is the most common cause of cancer-related deaths in the US, with adenocarcinoma being the most common histologic subtype. Aromatase, a critical rate-limiting enzyme in estrogen biosynthesis, is notably expressed in NSCLC cells. Retrospective studies show that high NSCLC aromatase levels are associated with worse clinical outcome, particularly in postmenopausal women (Weinberg et al., Cancer Res, 2005; Mah et al., Cancer Res, 2007; Garon et al., J Thoracic Oncol, 2013). Estrogens are known survival factors in lung and promote expression of nucleotide excision repair enzyme ERCC1 that is implicated in resistance to platinum-therapy. In NSCLC cells, ERCC1 transcript expression is blocked by exemestane, an aromatase inhibitor (AI), enhancing cisplatin-induced apoptosis. In preclinical NSCLC xenograft models, exemestane exerts synergistic antitumor activity combined with cisplatin and results in prolonged tumor suppression (Marquez-Garban et al., Ann NY Acad Sci, 2009). These data provide a rationale to assess an AI in the clinic.
Methods:
Based on our preclinical studies, we are conducting a phase IB, open-label, single-center study in postmenopausal, treatment-naïve (except prior single-agent tyrosine kinase inhibitor use) women with metastatic, non-squamous NSCLC (NCT 01664754). We plan to enroll 12-15 participants divided into two dose-escalation cohorts of exemestane. All participants receive standard chemotherapy with pemetrexed (500 mg/m[2]) and carboplatin (AUC 6), both given intravenously every 3 weeks. Cohort 1, which added exemestane 25 mg orally daily, has completed enrollment without any dose-limiting toxicities. Cohort 2, for which enrollment started in December of 2013, evaluates exemestane at 50 mg orally daily. Our primary aim is to evaluate safety and tolerability of the indicated regimen. Secondary objectives are tumor response rate, quality of life, pharmacokinetics/pharmacodynamics, and correlative studies of biomarkers (such as blood estrogens, tumor ERs, aromatase, and apoptosis) with tumor response.
Results:
Not applicable
Conclusion:
Not applicable
