• Reported new Phase
  
  1b
  
  /2 data from lead KRAS-mutated metastatic colorectal cancer (mCRC) clinical program showing objective response rate and median progression-free survival that substantially exceed those recorded in historical control trials
• Announced new data from Phase 2 metastatic castration-resistant prostate cancer (mCRPC) trial showing clinically meaningful disease control rates that rose with increasing onvansertib dose density
• Presented new genomic analyses from Phase 2 mCRPC trial that show a positive association between treatment response and alterations in
  
  MTOR
  
  and
  
  PTEN
  
  , two key genes in the PI3K signaling pathway
• Reported new preclinical data that show onvansertib combining with a PARP inhibitor to overcome PARP inhibitor resistance in
  
  BRCA1
  
  -mutant and wild-type patient-derived xenograft ovarian cancer models
• Cash, cash equivalents, and short-term investments of approximately
  
  $129.4 million
  
  as of
  
  March 31, 2022
  

SAN DIEGO


,


May 5, 2022


/PRNewswire/ — Cardiff Oncology, Inc. (Nasdaq: CRDF), a clinical-stage biotechnology company leveraging PLK1 inhibition to develop novel therapies across a range of cancers, today announced recent company highlights and financial results for the first quarter ended

March 31, 2022

.

“With a strong balance sheet and clinical data highlighting onvansertib’s potential to improve patient outcomes by combining synergistically with the standard-of-care, we believe we are well positioned for success,” said

Mark Erlander

, Ph.D., chief executive officer of Cardiff Oncology. “Phase

1b

/2 data from our lead KRAS-mutated metastatic colorectal cancer (mCRC) program show clear improvements in treatment response and durability compared to historical controls. These results also clinically demonstrate onvansertib’s KRAS-agnostic mechanism of action, setting it apart from competing agents that target only the G12C variant.”

Dr. Erlander added, “We are also highly encouraged by recent data from our Phase 2 prostate cancer trial showing clinically meaningful disease control rates in patients who showed signs of progression on prior therapy, and preclinical studies that showed onvansertib-PARP inhibitor combination therapy leading to statistically significant survival benefits in patient-derived xenograft models of PARP-inhibitor-resistant ovarian cancer. These results further highlight how onvansertib’s ability to inhibit PLK1 positions it to target tumor vulnerabilities and overcome treatment resistance across a spectrum of indications. We look forward to building on these results as we move towards the second half of the year.”

Program highlights for the quarter ended

March 31, 2022

, and recent business updates include:

KRAS-mutated mCRC Program:

Reported new Phase

1b

/2 data showing treatment with onvansertib plus FOLFIRI/bevacizumab leading to an objective response rate (ORR) and median progression-free survival (mPFS) that substantially exceed those recorded in historical control trials

The data were announced on a webcast and conference call hosted by Cardiff Oncology, and a subset were presented by

Heinz-Josef Lenz

, M.D., FACP, principal investigator,

USC

Norris Comprehensive Cancer Center, in a poster at the American Society of Clinical Oncology Gastrointestinal Cancers Symposium (ASCO GI). Highlights from the webcast and conference call include:

Efficacy data in evaluable patients:

• Among patients treated per protocol with onvansertib at the recommended Phase 2 dose (RP2D; 15 mg/m
  
  ²
  
  ) in combination with FOLFIRI/bevacizumab:
• 34% (12 of 35) achieved an initial complete response (CR) or partial response (PR)
• 29% (10 of 35) achieved a confirmed CR or PR (awaiting confirmatory scan for 1 patient)
• Historical control trials evaluating different drug combinations, including the standard-of-care of FOLFIRI with bevacizumab, in similar patient populations have shown ORRs of 5-13%
  
  ^1-4
  
• Patients evaluable for response treated at onvansertib dose levels 12 mg/m
  
  ²
  
  , 15 mg/m
  
  ²
  
  , and 18 mg/m
  
  ²
  
• 35% (17 of 48) achieved an initial CR or PR
• 27% (13 of 48) achieved a confirmed CR or PR (awaiting confirmatory scan for 1 patient)

mPFS, biomarker, and safety data:

• mPFS not yet reached in patients treated per protocol at the RP2D
• mPFS across all response-evaluable patients (n = 48) is 9.4 months (95% confidence interval: 7.1 – not yet reached)
• mPFS of ~4.5-5.7 months has been reported in historical control trials
  
  ^1-4
  
• Complete or partial responses were observed across seven different KRAS mutation variants, including the 3 most commonly observed in colorectal cancer (G12D, G12V, G13D)
• Onvansertib in combination with FOLFIRI/bevacizumab has been well-tolerated with only 11% (84/788) of reported treatment-emergent adverse events (TEAEs) being G3/G4

Metastatic Castration-resistant Prostate Cancer (mCRPC) Program:

Announced updated clinical and new biomarker data from Phase 2 trial evaluating onvansertib in combination with abiraterone/prednisone in mCRPC patients showing initial abiraterone resistance

Results from the trial, which were presented in a poster at the American Association for Cancer Research (AACR) Annual Meeting, showed clinically meaningful disease control rates that rose with increasing onvansertib dose density. Additional highlights from the announcement include:

• 75% (15 of 20) evaluable patients in Arm C, which represents the trial’s most dose dense treatment schedule, showed disease control by radiographic stable disease (SD/PR) at 12-weeks, compared to 9 of 17 (53%) and 11 of 19 (58%) in the less dose-dense Arms A and B, respectively
• Treatment response (SD/PR) was positively associated with mutations in PTEN and MTOR, key genes in the PI3K signaling pathway
• Gene signatures correlating with treatment response included those corresponding to the ERG+ and Notch pathways, which are involved in cell-invasion, epithelial-mesenchymal transition, and metastasis
• Genes related to mitochondrial and immune functions were downregulated in patients achieving SD or a PR compared to those showing progressive disease
• Onvansertib in combination with abiraterone/prednisone has been well tolerated in the trial

Each arm in the trial has evaluated a different dosing schedule of onvansertib alongside abiraterone and prednisone administered throughout the respective treatment cycle. Arm A evaluated 24 mg/m

²

onvansertib on Days 1-5 of 21-day cycles, Arm B evaluated 18 mg/m

²

onvansertib on Days 1-5 of 14-day cycles, and Arm C is evaluating 12 mg/m

²

onvansertib on Days 1-14 of 21-day cycles.

Preclinical Highlights:

Reported new preclinical data that show onvansertib combining with a PARP inhibitor to overcome PARP inhibitor (PARPi) resistance in BRCA1-mutant and wild-type patient-derived xenograft ovarian cancer models

Preclinical studies featured in a poster presentation at the AACR Annual Meeting evaluated onvansertib in combination with the PARPi olaparib in three olaparib-resistant patient-derived xenograft (PDX) ovarian cancer models. Two of the three PDX models studied were cisplatin-sensitive with a mutated

BRCA1

gene, while the third was cisplatin-resistant with wild type

BRCA1

. Results showed that treatment with onvansertib plus olaparib led to a statistically significant survival benefit compared to treatment with either agent alone in each of the three evaluated PDX models. The combination regimen was also shown to be well tolerated in mice.

First Quarter 2022 Financial Results:

Liquidity and cash burn

As of

March 31, 2022

, Cardiff Oncology had approximately

$129.4 million

in cash, cash equivalents, and short-term investments.

Net cash used in operating activities for the first quarter of 2022 was approximately

$10.2 million

, an increase of approximately

$4.3 million

from

$5.9 million

for the same period in 2021.

Operating Expenses

The overall increase in research and development expenses was primarily due to costs associated with an increase in outside service costs related to chemistry, manufacturing, and controls (“CMC”) and pharmacology for the development of our lead drug candidate, onvansertib. Salaries and staff costs increased due to a higher headcount in the current period, as compared to the prior period. The increase in stock-based compensation is due to additional stock option grants to employees granted subsequent to the prior period.

The overall increase in selling, general and administrative expense was primarily due to costs associated with outside services and stock-based compensation. The increase in outside services is related to strategic valuation consulting related to our lead drug candidate, onvansertib. The increase in stock-based compensation is due to additional stock option grants to employees and directors granted subsequent to the prior period.

References

1. 
   Giessen
   
   et al., Acta Oncologica 2015, 54: 187-193
2. Cremolini et al., Lancet Oncol 2020, 21: 497–507
3. Antoniotti et al., Correspondence Lancet Oncol
   
   June 2020
   
4. Bennouna et al., Lancet Oncol 2013; 14: 29–37

About Cardiff Oncology, Inc.


Cardiff Oncology is a clinical-stage biotechnology company leveraging PLK1 inhibition to develop novel therapies across a range of cancers. Our lead asset is onvansertib, an oral highly-selective PLK1 inhibitor, which we are evaluating in combination with standard-of-care (SOC) therapeutics in clinical programs targeting indications such as KRAS-mutated metastatic colorectal cancer, metastatic pancreatic ductal adenocarcinoma, and metastatic castrate-resistant prostate cancer. These programs and our broader development strategy are designed to target tumor vulnerabilities in order to overcome treatment resistance and deliver superior clinical benefit compared to the SOC. For more information, please visit

Cardiff Oncology

.

Forward-Looking Statements


Certain statements in this press release are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. These statements may be identified using words such as “anticipate,” “believe,” “forecast,” “estimated” and “intend” or other similar terms or expressions that concern Cardiff Oncology’s expectations, strategy, plans or intentions. These forward-looking statements are based on Cardiff Oncology’s current expectations and actual results could differ materially. There are several factors that could cause actual events to differ materially from those indicated by such forward-looking statements. These factors include, but are not limited to, clinical trials involve a lengthy and expensive process with an uncertain outcome, and results of earlier studies and trials may not be predictive of future trial results; our clinical trials may be suspended or discontinued due to unexpected side effects or other safety risks that could preclude approval of our product candidates; risks related to business interruptions, including the outbreak of COVID-19 coronavirus, which could seriously harm our financial condition and increase our costs and expenses; uncertainties of government or third party payer reimbursement; dependence on key personnel; limited experience in marketing and sales; substantial competition; uncertainties of patent protection and litigation; dependence upon third parties; and risks related to failure to obtain FDA clearances or approvals and noncompliance with FDA regulations. There are no guarantees that any of our technology or products will be utilized or prove to be commercially successful. Additionally, there are no guarantees that future clinical trials will be completed or successful or that any precision medicine therapeutics will receive regulatory approval for any indication or prove to be commercially successful. Investors should read the risk factors set forth in Cardiff Oncology’s Form 10-K for the year ended December 31, 2021, and other periodic reports filed with the Securities and Exchange Commission. While the list of factors presented here is considered representative, no such list should be considered to be a complete statement of all potential risks and uncertainties. Unlisted factors may present significant additional obstacles to the realization of forward-looking statements. Forward-looking statements included herein are made as of the date hereof, and Cardiff Oncology does not undertake any obligation to update publicly such statements to reflect subsequent events or circumstances.

Cardiff Oncology Contact:



James Levine


Chief Financial Officer

858-952-7670


[email protected]

Investor Contact:



Joyce Allaire


LifeSci Advisors

212-915-2569


[email protected]

Media Contact:



Amy Jobe

, Ph.D.

LifeSci Communications

315-879-8192


[email protected]

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SOURCE Cardiff Oncology, Inc.