Press Release Details

RAPT Therapeutics and Hanmi Pharmaceutical Announce Collaboration to Develop and Commercialize FLX475 in Asia

December 3, 2019

SOUTH SAN FRANCISCO, Calif. and SEOUL, South Korea, Dec. 03, 2019 (GLOBE NEWSWIRE) -- RAPT Therapeutics, Inc. (Nasdaq: RAPT), a clinical-stage immunology-based biopharmaceutical company focused on discovering, developing and commercializing oral small molecule therapies for patients with significant unmet needs in oncology and inflammatory diseases, and Hanmi Pharmaceutical Co., LTD today announced a license and collaboration agreement for FLX475 in Asia. FLX475 is an oral, small molecule CCR4 antagonist in development for the treatment of multiple cancers.

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Hanmi Logo
  Hanmi logo


“We are actively building our immuno-oncology portfolio, and see FLX475 as a potential keystone in our effort to deliver new safe and effective cancer therapeutics to patients who need them,” said Hanmi CEO Se-Chang Kwon, Ph.D. “This compound complements our current product portfolio and has the potential to address a large and growing population of patients suffering from cancers that are prevalent in Asian countries. We look forward to partnering with RAPT to advance FLX475 through the clinic efficiently.”

Under the terms of the agreement, RAPT will receive $10 million in an upfront payment and near-term milestone payment. Additionally, RAPT will receive up to $48 million in success-based development milestones and up to $60 million in potential sales milestones, as well as double-digit royalties on any future sales of FLX475 in the specified territories. In return, Hanmi will receive an exclusive license to develop, in parallel with RAPT, and commercialize FLX475 for the treatment of cancer in South Korea and China, including Taiwan and Hong Kong. In addition to leveraging its clinical trial infrastructure in Korea and China to augment RAPT’s ongoing Phase 1/2 clinical study of FLX475, Hanmi will also conduct a Phase 2 clinical trial in Korea and China to evaluate FLX475 in patients with gastric cancer.

“FLX475 targets “charged” tumors including virally-associated cancers, gastric cancer, non-small cell lung cancer, triple negative breast cancer and head and neck cancers, which are predicted to have high levels of CCR4 ligands, regulatory T cells and CD8+ effector T cells,” said Yung-Jue Bang, M.D., Ph.D.,  professor of Medical Oncology at Seoul National University Hospital. “I believe FLX475 has the potential to offer patients a new therapeutic option that is desperately needed, particularly in Korea, which has the highest rate of gastric cancer in the world.”

“This collaboration with Hanmi can provide us an entry point into the Asian market, allowing us to potentially expand our geographic footprint in a region with high prevalence of patients with “charged” tumors who we believe are most likely to respond to FLX475,” said Brian Wong, M.D., Ph.D., president and CEO of RAPT Therapeutics. “Hanmi, with its fully integrated R&D infrastructure and nimble execution efficiency, has accumulated clinical development experiences and an extensive network of key opinion leaders. We believe Hanmi is a perfect partner for the development of FLX475.”

FLX475 is a small molecule CCR4 antagonist designed to block the migration of regulatory T cells (Treg) specifically into tumors, but not healthy tissues. Treg represent a dominant pathway for downregulating the immune response, and may limit the effectiveness of currently available therapies such as checkpoint inhibitors. RAPT is developing FLX475 for the treatment of a broad range of “charged” tumors, which represent cancer types the company believes are most likely to respond to FLX475, where a large quantity of Treg cells are likely to be the cause of immune suppression within the tumor. FLX475 blocks the migration of Treg to the tumor, which may restore naturally occurring antitumor immunity and synergizing with a variety of both conventional and immune-based therapies, such as radiation, chemotherapy, checkpoint inhibitors, immune stimulators and adoptive T cell therapy.

RAPT is currently enrolling patients in a Phase 1/2 study of FLX475 as a monotherapy, and in combination with pembrolizumab, in patients with “charged” tumors and expect results from the Phase 2 portion of the trial in the first half of 2020.

About Hanmi Pharmaceutical Co., LTD
Hanmi Pharmaceutical is a Korea-based global pharmaceutical company focused on the development and commercialization of new pharmaceutical products. The Company is fully integrated from R&D through manufacturing, marketing and sales with an established presence in Korea as well as China. More information on Hanmi is available at

About RAPT Therapeutics, Inc.
RAPT Therapeutics (formerly FLX Bio) is a clinical stage immunology-based biopharmaceutical company focused on discovering, developing and commercializing oral small molecule therapies for patients with significant unmet needs in oncology and inflammatory diseases. Utilizing its proprietary discovery and development engine, the company is developing highly selective small molecules designed to modulate the critical immune responses underlying these diseases. In its first four years since inception, RAPT has discovered and advanced two unique drug candidates, each targeting C-C motif chemokine receptor 4. The company’s lead oncology drug candidate, FLX475, reached the clinic in just two and a half years and its lead inflammation drug candidate, RPT193, is also in the clinic. The company is also pursuing a range of targets, including general control nonderepressible 2 and hematopoietic progenitor kinase 1, that are in the discovery stage of development.

Forward-Looking Statements
This press release contains forward-looking statements. These statements relate to future events and involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements to be materially different from any future performances or achievements expressed or implied by the forward-looking statements. Each of these statements is based only on current information, assumptions and expectations that are inherently subject to change and involve a number of risks and uncertainties. Forward-looking statements include, but are not limited to, statements about: the clinical development of FLX475, RAPT’s collaboration with Hanmi in regard to the Asian market in the future, and the parties’ performance of the license and collaboration agreement. Detailed information regarding factors that may cause actual results to differ materially from the results expressed or implied by statements in this press release may be found in RAPT’s final prospectus filed with the Securities and Exchange Commission on November 1, 2019. These forward-looking statements speak only as of the date hereof. RAPT disclaims any obligation to update these forward-looking statements.

RAPT Media Contact:
Angela Bitting 
(925) 202-6211

RAPT Investor Contact:
Sylvia Wheeler


Source: RAPT Therapeutics, Inc.