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Mirati presents data from sitravatinib in combination with nivolumab trials

Mirati Therapeutics (MRTX) announced the presentation of initial data from its ongoing Phase 2 clinical trial of sitravatinib in combination with nivolumab in metastatic urothelial cancer patients with documented progression on a platinum-chemotherapy and checkpoint inhibitor.

Mirati is in focus on cancer data, Stockwinners

The data were presented in an oral presentation at the Society of Immunotherapy of Cancer 34th Annual Meeting.

Preliminary results from the ongoing Phase 1 study of neoadjuvant sitravatinib combined with nivolumab in patients with resectable squamous cell carcinoma of the oral cavity, SNOW trial, were also presented in a poster session.

The preliminary data suggest that the combination of neoadjuvant sitravatinib and nivolumab is safe and active in patients with squamous cell carcinoma of the oral cavity who are candidates for resection.

Chart shows Sitravatinib in action, Stockwinners

Tumor reduction was observed in all eight patients who were eligible for evaluation, including one complete pathological response.

All patients received postoperative radiation therapy, and none required postoperative chemotherapy.

With a median follow-up of 31.4 weeks, all patients are alive with no disease recurrence to date.

In most patients, treatment with sitravatinib led to a decrease in myeloid-derived suppressor cells and a shift towards M1-type macrophages in the tumor microenvironment, supporting previous preclinical findings.

“Sitravatinib is a spectrum-selective kinase inhibitor that potently inhibits receptor tyrosine kinases, including TAM family receptors that has the potential to increase responsiveness in patients whose tumors are resistant to checkpoint inhibitors. The initial efficacy data from the Phase 2 clinical trial presented today in patients with checkpoint refractory mUC is promising and extends the clinical benefit data beyond what has already been demonstrated by sitravatinib combined with nivolumab in checkpoint refractory non-small cell lung cancer,” said Charles Baum, M.D., CEO of Mirati.

Sitravatinib offers hope for cancer patients, Stockwinners

“In addition, we are evaluating sitravatinib in patients who have progressed on checkpoint therapy, including those with NSCLC and renal cell cancer, and we continue to expand development efforts of sitravatinib through our collaboration with BeiGene in multiple indications including NSCLC, renal cell cancer, hepatocellular cancer, ovarian cancer, and gastric cancer.”

MRTX closed at $104.78.

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Nektar Therapeutics is in focus

Nektar presents new clinical, preclinical data from immuno-oncology pipeline

Nektar Therapeutics (NKTR) announced the presentation of five clinical and preclinical data abstracts focused on its immuno-oncology portfolio at the 2019 Society for Immunotherapy of Cancer Annual Meeting.

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Nektar Therapeutics is in focus, Stockwinners

New clinical results from the PIVOT-02 Phase 1/2 study were shared in an oral presentation titled, “Clinical activity of BEMPEG plus NIVO in previously untreated patients with metastatic melanoma: updated results from the Phase 1/2 PIVOT-02 Study” during the Combination Phase 1-2 Clinical Trials Session on Saturday, November 9th.

Additional preclinical data presented at the annual meeting highlighted NKTR-255, an IL-15 agonist discovered by Nektar.

The presentations demonstrated that NKTR-255 enhanced activity of antibody-dependent cellular cytotoxicity against tumor cells in vitro, and that it also enhanced in vivo efficacy of ADCC-inducing antibodies in models of human solid tumors.

NKTR-255 is designed to engage the IL-15 pathway to stimulate and expand natural killer cells and promote the survival and expansion of memory CD8+ T cells without inducing suppressive regulatory T cells.

Nektar product pipeline, Stockwinners

NKTR-255 is currently being evaluated in a Phase 1/2 clinical trial in patients with either relapsed or refractory Non-Hodgkin’s lymphoma or multiple myeloma.

“The data presented at this year’s SITC meeting continue to showcase the potential of our I-O portfolio, most notably our key IL-2 pathway program, bempeg, and our new IL-15 pathway program, NKTR-255,” said Jonathan Zalevsky, Ph.D., Chief Research & Development Officer at Nektar.

“The 18-month follow-up data presentation for the Stage IV melanoma patients in our PIVOT-02 study reinforces the promise of BEMPEG and NIVO to work synergistically to achieve a deepening of response over time, while maintaining a favorable safety and tolerability profile. We’re pleased that at this 18 month timepoint, 85% of patients who achieved responses have ongoing responses and median PFS has not yet been reached.”

Separately, Nektar Therapeutics (NKTR) announced updated results from the first-in-human Phase 1a study of NKTR-358, a novel T regulatory cell stimulator in development for the treatment of autoimmune and other chronic inflammatory conditions.

Nektar reports new data, Stockwinners

The data, which were presented at the 2019 Annual Meeting of the American College of Rheumatology in Atlanta, show that treatment with NKTR-358 led to a marked and selective dose-dependent expansion in the numbers and proliferative capacity of FoxP3+CD25bright Treg cells, and a measurable activation of Treg cells.

These data are a continuation of initial results reported at 2019 Annual European Congress of Rheumatology in June 2019.

NKTR-358 is designed to treat autoimmune and inflammatory conditions by correcting the immune system imbalance that results from reduced numbers and impaired function of immune-regulating Treg cells.

NKTR-358 works by targeting the interleukin-2 receptor complex to stimulate the proliferation and activation of Treg cells.

NKTR-358 was discovered by Nektar and is being co-developed and commercialized in partnership with Eli Lilly (LLY).

Eli Lilly announces Alimta label expanded by FDA, Stockwinners
Eli Lilly and Nektar report new data, Stockwinners

“We’re pleased to report that final results from our first-in-human Phase 1a study continue to support the positive safety and tolerability profile of NKTR-358, while reinforcing its selective and measurable impact on the numbers, expansion and activation of regulatory T cells or Tregs,” said Brian Kotzin, M.D., senior VP, Clinical Development and NKTR-358 Program Lead at Nektar.

“Autoimmune and inflammatory diseases are marked by an imbalance in the body’s self-tolerance and self-regulatory immune pathways, and the ability of NKTR-358 to expand functional Tregs could help restore normal balance.

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