On May 12, 2022 Nkarta, Inc. (Nasdaq: NKTX), a clinical-stage biopharmaceutical company developing engineered natural killer (NK) cell therapies to treat cancer, reported financial results for the first quarter ended March 31, 2022 (Press release, Nkarta, MAY 12, 2022, View Source [SID1234614335]).

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"Last month marked an exciting new chapter for Nkarta and the field of cell therapy as we announced positive preliminary data for our co-lead NK cell therapy candidates, NKX101 and NKX1019, validating our best-in-class allogeneic NK cell platform," said Paul J. Hastings, President and CEO of Nkarta. "Independent clinical trials showed early evidence of powerful anti-tumor activity and beneficial safety profiles in patients with two distinct types of relapsed / refractory hematologic malignancies. Early signs of durability and deepening of responses with additional cycles of therapy were observed in both trials, including MRD negativity in patients with AML who received NKX101. Enrollment is underway at higher 3-dose monotherapy regimens of 1.5 billion cells per dose in both dose expansion studies, and Nkarta looks forward to presenting additional data later this year."

NKX101 Clinical Update

On April 25, 2022, Nkarta reported preliminary data from its Phase 1 study evaluating NKX101, an allogeneic, cryopreserved, off-the-shelf cancer immunotherapy candidate that uses NK cells engineered to target NKG2D ligands on cancer cells, as a multi-dose, multi-cycle monotherapy in patients with relapsed / refractory (r/r) acute myeloid leukemia (AML) and higher-risk myelodysplastic syndrome (MDS). As of data cut-off on April 21, 2022, 21 patients had been enrolled and dosed.
Three of five patients with heavily pre-treated AML treated at the higher dose level in a three-dose regimen achieved a complete response (60% CR) with hematologic recovery, with two of the three responses MRD (measurable residual disease) negative.
NKX101 was generally well tolerated. No dose-limiting toxicities were observed. No cytokine release syndrome (CRS), graft-versus-host disease (GvHD), or immune effector cell-associated neurotoxicity syndrome (ICANS) was observed. The most common higher-grade adverse events were myelosuppression and infection, which are common in this patient population following lymphodepletion.
NKX019 Clinical Update

On April 25, 2022, Nkarta reported preliminary data from its Phase 1 study evaluating NKX019, an allogeneic, cryopreserved, off-the-shelf cancer immunotherapy candidate that uses NK cells engineered to target the B-cell antigen CD19, as a multi-dose, multi-cycle monotherapy in patients with r/r B-cell malignancies. As of data cut-off on April 21, 2022, 13 patients had been enrolled and dosed.
Three of six patients treated at the higher dose level in a three-dose regimen showed a complete response (50% CR), including one patient with aggressive diffuse large B cell lymphoma (DLBCL) and one patient with mantle cell lymphoma (MCL).
NKX019 was generally well tolerated. No dose-limiting toxicities were observed. No CRS, GvHD, or neurotoxicity (ICANS) was observed. The most common higher-grade adverse events were myelosuppression, which is common in this patient population following lymphodepletion.
Anticipated Clinical Milestones

As previously announced, Nkarta plans to present additional clinical data in the second half of 2022 from its ongoing dose escalation clinical trials of NKX101 and NKX019. These data would include longer follow-up on previously reported responses as well as safety and activity data from patients being enrolled in the 3-dose monotherapy regimen of 1.5 billion CAR NK cells per dose.
Pipeline and Platform

In April 2022, Nkarta presented preclinical data from its engineered NK cell platform in four posters at the annual meeting of the American Association for Cancer Research (AACR) (Free AACR Whitepaper). The posters included data on the use of CRISPR/Cas9 genome editing to enhance the ability of NK cells to target CD70 antigen (jointly presented with CRISPR Therapeutics); analytical and translational methods to better understand patterns of response to CAR NK cells; analysis of surface antigen expression in preclinical models of multiple myeloma; and immune masking strategies for extending the persistence of allogeneic cell therapies.
Other Corporate Highlights

In April 2022, Nkarta received approximately $215.5 million in net proceeds from a public offering of its common stock. This amount included the exercise in full by the underwriters of their option to purchase additional shares of common stock.
In March 2022, Nkarta appointed Angela M. Thedinga, MBA, MPH to its Board of Directors. Ms. Thedinga, an experienced manufacturing technology executive, brings extensive operational expertise in supply chain and commercial-scale manufacturing operations.
First Quarter 2022 and Recent Financial Highlights

Cash and Cash Equivalents: As of March 31, 2022, Nkarta had cash, cash equivalents, restricted cash, and short-term investments of $219.1 million. This amount does not include net proceeds of approximately $215.5 million from the public offering of common stock in April 2022.
R&D Expenses: Research and development (R&D) expenses were $19.6 million for the first quarter of 2022. Non-cash stock-based compensation expense included in R&D expense was $1.9 million for the first quarter of 2022.
G&A Expenses: General and administrative (G&A) expenses were $6.5 million for the first quarter of 2022. Non-cash stock-based compensation expense included in G&A expense was $2.2 million for the first quarter of 2022.
Net Loss: Net loss was $26.0 million, or $0.79 per basic and diluted share, for the first quarter of 2022. This net loss includes non-cash charges of $6.7 million that consisted primarily of share-based compensation of $4.1 million.
Financial Guidance

Nkarta expects its current cash and cash equivalents will be sufficient to fund its current operating plan into 2025. This guidance reflects the proceeds received following the April 2022 public offering of common stock.
About NKX101
NKX101 is an allogeneic, cryopreserved, off-the-shelf cancer immunotherapy candidate that uses natural killer (NK) cells derived from the peripheral blood of healthy donors. It is engineered with a chimeric antigen receptor (CAR) targeting NKG2D ligands on tumor cells. NKG2D, a key activating receptor found on naturally occurring NK cells, induces a cell-killing immune response through the detection of stress ligands that are widely expressed on cancer cells. NKX101 is also engineered with membrane-bound form of interleukin-15 (IL15) for greater persistence and activity without exogenous cytokine support. To learn more about the NKX101 clinical trial in adults with AML or MDS, please visit ClinicalTrials.Gov.

About NKX019
NKX019 is an allogeneic, cryopreserved, off-the-shelf cancer immunotherapy candidate that uses natural killer (NK) cells derived from the peripheral blood of healthy adult donors. It is engineered with a humanized CD19-directed CAR for enhanced tumor cell targeting and a proprietary, membrane-bound form of interleukin-15 (IL-15) for greater persistence and activity without exogenous cytokine support. CD19 is a biomarker for normal and malignant B cells, and it is a validated target for B cell cancer therapies. To learn more about the NKX019 clinical trial in adults with advanced B cell malignancies, please visit ClinicalTrials.Gov.