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Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC).

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Friedlander, TW; Milowsky, MI; Bilen, MA; Srinivas, S; McKay, RR; Flaig, TW; Hoimes, CJ; Balar, AV; Henry, E; Petrylak, DP; Sasse, C; Yu, Y ...
Published in: Journal of Clinical Oncology
May 20, 2021

4528 Background: Significant unmet need remains for people with cisplatin-ineligible (cis-ineligible) locally advanced or metastatic urothelial carcinoma (la/mUC). In the first-line (1L) setting, carboplatin-based regimens have demonstrated poor tolerability, modest objective response rate (ORR) and limited durability. PD-1/PD-L1 inhibitors demonstrate durable responses; however, only a minority of pts achieve a response (ORR 24-29%). Enfortumab vedotin (EV) is an antibody-drug conjugate (ADC) delivering the microtubule-disrupting agent monomethyl auristatin E (MMAE) to targeted tumor cells expressing Nectin-4. EV has shown an overall survival benefit versus chemotherapy in previously treated la/mUC. Preclinical studies show that ADCs utilizing MMAE can induce immunogenic cell death and may enhance antitumor immunity. Clinical data suggests the combination of EV + pembrolizumab (P) may have the potential to induce greater antitumor activity compared to either agent alone. Preliminary data on EV + P was previously presented, and the FDA granted breakthrough therapy designation to EV + P for the treatment of pts with 1L cis-ineligible la/mUC in Feb 2020. Here we report updated data with 24.9 months median follow-up. Methods: This multi-cohort EV-103 study (NCT03288545) evaluates the safety/activity of EV + P (Dose Escalation/Cohort A). This report highlights 1L cis-ineligible pts treated with 3-week cycles of EV 1.25 mg/kg (Days 1, 8) and P (Day 1). Endpoints include safety/tolerability, investigator response per RECIST v1.1, DOR, PFS, and OS. Results: As of 13 Oct 2020, the median follow-up for the 45 1L la/mUC pts (median age 69 yrs [51-90]) was 24.9 months. The median number cycles of EV + P was 9 (range 1-34). The most common treatment-related adverse events were peripheral sensory neuropathy (56%, 4% ≥G3), fatigue (51%, 11% ≥G3), and alopecia (49%). There was one death reported as possibly related to study treatment (multiple organ dysfunction syndrome) per investigator assessment. Confirmed ORR is 73.3% (95% CI: 58.1, 85.4) including 17.8% CR and an ORR of 57.1% (8/14) in pts with liver metastasis. The median DOR was 25.6 months (95% CI: 8.3, -). Fifty-three percent of the responders had DOR at 24 months. Additionally, the DCR is 93.3%, the median PFS is 12.3 months (95% CI: 8.0, -), and the median OS is not reached. The OS rate at 24 months is 56.3% (95% CI: 39.8, 69.9). Conclusions: EV + P, a platinum-free option, continues to demonstrate promising activity with a durable response profile in 1L cis-ineligible pts with la/mUC. The safety profile is manageable and stable over time with no new safety signals. Cohort K of EV-103 in cis-ineligible pts with la/mUC is actively randomizing pts to EV monotherapy or EV + P to evaluate the contribution of each agent. Clinical trial information: NCT03288545.

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Published In

Journal of Clinical Oncology

DOI

EISSN

1527-7755

ISSN

0732-183X

Publication Date

May 20, 2021

Volume

39

Issue

15_suppl

Start / End Page

4528 / 4528

Publisher

American Society of Clinical Oncology (ASCO)

Related Subject Headings

  • Oncology & Carcinogenesis
  • 3211 Oncology and carcinogenesis
  • 1112 Oncology and Carcinogenesis
  • 1103 Clinical Sciences
 

Citation

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Friedlander, T. W., Milowsky, M. I., Bilen, M. A., Srinivas, S., McKay, R. R., Flaig, T. W., … Rosenberg, J. E. (2021). Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC). In Journal of Clinical Oncology (Vol. 39, pp. 4528–4528). American Society of Clinical Oncology (ASCO). https://doi.org/10.1200/jco.2021.39.15_suppl.4528
Friedlander, Terence W., Matthew I. Milowsky, Mehmet Asim Bilen, Sandy Srinivas, Rana R. McKay, Thomas W. Flaig, Christopher J. Hoimes, et al. “Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC).” In Journal of Clinical Oncology, 39:4528–4528. American Society of Clinical Oncology (ASCO), 2021. https://doi.org/10.1200/jco.2021.39.15_suppl.4528.
Friedlander TW, Milowsky MI, Bilen MA, Srinivas S, McKay RR, Flaig TW, et al. Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC). In: Journal of Clinical Oncology. American Society of Clinical Oncology (ASCO); 2021. p. 4528–4528.
Friedlander, Terence W., et al. “Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC).Journal of Clinical Oncology, vol. 39, no. 15_suppl, American Society of Clinical Oncology (ASCO), 2021, pp. 4528–4528. Crossref, doi:10.1200/jco.2021.39.15_suppl.4528.
Friedlander TW, Milowsky MI, Bilen MA, Srinivas S, McKay RR, Flaig TW, Hoimes CJ, Balar AV, Henry E, Petrylak DP, Sasse C, Kataria RS, Yu Y, Carret A-S, Rosenberg JE. Study EV-103: Update on durability results and long term outcome of enfortumab vedotin + pembrolizumab in first line locally advanced or metastatic urothelial carcinoma (la/mUC). Journal of Clinical Oncology. American Society of Clinical Oncology (ASCO); 2021. p. 4528–4528.

Published In

Journal of Clinical Oncology

DOI

EISSN

1527-7755

ISSN

0732-183X

Publication Date

May 20, 2021

Volume

39

Issue

15_suppl

Start / End Page

4528 / 4528

Publisher

American Society of Clinical Oncology (ASCO)

Related Subject Headings

  • Oncology & Carcinogenesis
  • 3211 Oncology and carcinogenesis
  • 1112 Oncology and Carcinogenesis
  • 1103 Clinical Sciences