Nektar presents biomarker, clinical data from PIVOT-02 Phase 2 study
Nektar Therapeutics (NKTR) announced that biomarker and clinical data from PIVOT-02 was presented at the 2019 American Society of Clinical Oncology Meeting in Chicago, Illinois.
#Bempegaldesleukin is an investigational, CD122-preferential IL-2 pathway agonist designed to provide sustained signaling through the IL-2 beta-gamma receptor.
Bempegaldesleukin is under investigation in clinical trial NCT03729245 (A Study of NKTR-214 in Combination With Nivolumab Compared With the Investigator’s Choice of a Tyrosine Kinase Inhibitor (TKI) Therapy (Either Sunitinib or Cabozantinib Monotherapy) for Advanced Metastatic Renal Cell Carcinoma (RCC)).
PIVOT-02 is an ongoing Phase 2 study evaluating bempeg in combination with nivolumab in solid tumors.
Exploratory biomarker analyses of PIVOT-02 baseline tumor biopsies identified immune signatures that potentially enrich for response in patients with 1L metastatic melanoma and not 1L metastatic urothelial carcinoma.
Notable response rates were seen in both 1L metastatic melanoma and 1L metastatic urothelial cancer patients, regardless of PD-L1 status or unfavorable tumor microenvironments.
At a median time of follow-up of 12.7 months, confirmed objective response rate was 53% in efficacy-evaluable patients, with 34% of patients achieving confirmed complete responses. 42% of patients achieved a maximum reduction of 100% in target lesions. DCR, also known as disease control rate was 74%.
Median time to response was 2 months. Median duration of response was not reached. At the 12.7 month median follow-up, data were too immature to calculate median progression-free survival. 80% of patients with responses have ongoing responses. Amongst the 35 patients with known pre-treatment PD-L1 status, ORR in PD-L1 negative patients was 6/14 and in PD-L1 positive patients was 13/21.
One of three patients with unknown PD-L1 baseline status experienced a CR.
A total of 6/41 of patients experienced a Grade 3 or higher TRAE with 4/41 patients discontinuing treatment due to a TRAE. A total of 41 patients have been treated at the RP2D with 3 patients discontinuing prior to 1st scan due to an unrelated treatment-emergent adverse event and patient decision.
A Phase 3 trial evaluating bempeg in combination with nivolumab versus nivolumab in first-line advanced melanoma patients is currently recruiting patients.
A Phase 2 pivotal trial evaluating bempeg in combination with nivolumab in first-line metastatic urothelial cancer is currently recruiting patients.
Piper Jaffray analyst Tyler Van Buren reiterates an Overweight rating and $100 price target on Nektar, and believes shares should be up significantly on Monday following updated data from the bempegaldesleukin + nivo PIVOT-02 melanoma cohort.
The increase in complete response rate from 24% to 34% at just beyond 12 months is more than the analyst and investors were anticipating and “the waterfall plot is like nothing [he has] ever seen in solid tumors.”
Ultimately, Van Buren believes the high quality of responses and the ability to maintain patients on therapy is contributing to robust durability, which increases his confidence in the ultimate outcome of the Phase III trial which will have a final mPFS evaluation around Q3 of 2020.
NKTR closed at $31.32.
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