Exhibit
99.1

ASX
ANNOUNCEMENT
31
July 2026 |
|
 |
Radiopharm Theranostics Reports
Business Update
Reported positive results
from the Phase 2b clinical trial of imaging agent RAD 101, showing 93% of
evaluable patients treated with RAD 101 achieved the primary
endpoint
Plans to initiate Phase 3 registrational
trial of RAD 101 in Q4 2026
Raised approximately $12.5M through
an institutional offer and launched a $6million Share Purchase Plan, post balance date
Sydney, Australia – 31 July
2026 – Radiopharm Theranostics (ASX: RAD, Nasdaq: RADX, “Radiopharm” or the “Company”), a clinical-stage
biopharmaceutical company focused on developing innovative oncology radiopharmaceuticals for areas of high unmet medical need, today announced
financial results for the quarter ended June 30, 2026, and provided a corporate update.
“We continue to make meaningful
progress across our portfolio as we advance a diverse pipeline of targeted radiopharmaceutical candidates designed to address some of
the most challenging cancers,” said Riccardo Canevari, CEO and Managing Director of Radiopharm Theranostics. “The positive
Phase 2b results for RAD 101 represent an important milestone for Radiopharm and reinforce our confidence in the potential of our technologies.
In addition, the early clinical signs in the third cohort of RAD 204, showing RECIST-confirmed Partial Response in the first patient treated
at this dose, is creating a lot of excitement among the Clinical Investigators of our Phase I therapeutic trial. Across the organization,
we are generating clinical data, advancing multiple development programs, and building the capabilities required to realize the full value
of our platform. With six active clinical programs spanning both diagnostic and therapeutic applications, we believe Radiopharm is establishing
a leading radiopharmaceutical company uniquely positioned to deliver innovative new medicines to patients while creating long-term value
for shareholders. We remain focused on executing against our development priorities and advancing what we believe could become a new generation
of precision cancer treatments.”
Program and Business Updates
18F-RAD101 – Small molecule
targeting fatty acid synthase radiolabelled with Fluorine-18
RAD 101 is being evaluated in a
single-arm U.S. Phase 2b clinical trial for the diagnostic performance of the molecule in 30 individuals with confirmed recurrent brain
metastases from solid tumors of different origins. RAD 101 has received U.S. Food and Drug Administration (FDA) Fast Track Designation
to expedite the review process and help bring the novel imaging small molecule to the over 300,000 patients diagnosed annually in the
U.S. with cerebral metastases.
| · | In July 2026, the Company announced that RAD 101 had met
its primary endpoint, with 93% of patients treated with RAD 101 achieving concordance with MRI imaging. Additionally, an interim analysis of 14 patients from six-month
follow-up and biopsy shows 86% (12/14) sensitivity. |
| | | |
| | ● | The Company anticipates the initiation of a Phase 3, multi-center, multi-country registrational study in Q4 2026. Siemens Healthineers
will manufacture and distribute doses of 18F-labeled RAD-101 through a partnership to support the Phase 3 registrational trial. |
Radiopharm Theranostics Limited
Suite 1, Level 3, 62 Lygon
Street, Carlton South VIC 3053 Australia
ABN: 57 647 877 889
ASX
ANNOUNCEMENT
31
July 2026 |
|
 |
177Lu-RAD204 – Nanobody targeting PD-L1 radiolabelled
with Lutetium 177
RAD 204 is being evaluated
in a Phase 1 study in PD-L1-driven cancers, including Non-Small Cell Lung Cancer (NSCLC), Small-Cell Lung Cancer (SCLC), Triple-negative
Breast Cancer (TNBC), Cutaneous Melanoma, head and neck squamous cell carcinoma (HNSCC) and Endometrial Cancer.
| · | Initial data from the first six patients across the first
two cohorts of the Phase 1 study showed tumor uptake in the PD-L1 positive lesions, in line with the published results of the previously
conducted imaging study |
| · | Data from the third cohort (90mCi) in the Phase 1 study of
RAD 204 showed that the first patient dosed at this dose level achieved a durable RECIST-confirmed partial response, with tumor shrinkage
up to -43%, still progression free after 7+ months. |
177Lu-RAD202 – Nanobody
targeting HER2 radiolabelled with Lutetium 177
The Company continues to evaluate
RAD 202 in the Phase 1 ‘HEAT’ clinical trial in patients with Human Epidermal Growth Factor Receptor 2 (HER2)-positive advanced
solid tumors. HER2 is overexpressed in breast cancer and several other solid tumors and represents a validated target in oncology. RAD
202 has demonstrated clinical proof-of-concept with positive safety and biodistribution.
| · | At the American Association for Cancer Research (AACR) Annual
Meeting 2026, the company presented initial findings from the Phase 1 first-in-human ‘HEAT’ clinical trial for RAD 202. At
the lowest dose level, RAD 202 showed meaningful tumor uptake and was generally well-tolerated in the first three treated patients, with
no dose-limiting toxicities or treatment discontinuations due to adverse events being observed. Organ-level absorbed radiation doses
were within expected and clinically acceptable ranges. |
| · | The Company previously received a positive recommendation from
the Data Safety and Monitoring Committee to advance RAD 202 to the next dose level of 130mCi in the Phase 1 ‘HEAT’ clinical
trial. The Company expects to complete enrolment of Cohort #3 in Q3 and the entire Phase 1 Dose Escalation by 1H 2027. |
Lu177-RV 01 – monoclonal
antibody targeting 4Ig isoform of B7H3 radiolabelled with Lutetium 177
RV 01 (Betabart) is a monoclonal antibody targeting the 4Ig isoform of
B7H3, an immune checkpoint protein that is highly expressed in tumors and not in healthy tissue. In multiple preclinical studies, RV-01
has shown tumor shrinkage and prolonged survival. This is the first radiopharmaceutical therapeutic developed by Radiopharm Ventures,
a joint venture between Radiopharm Theranostics and the MD Anderson Cancer Center.
| · | The Company continues to make progress advancing the first-in-human (FIH) Phase 1/2a clinical trial of RV 01, which is designed to establish
the safety profile, biodistribution, pharmacokinetics, and radiation dosimetry of RV 01 in various tumor types. The trial will also determine
the recommended dose of RV-01 for future studies. |
Tb161-RAD 402 – Monoclonal antibody
targeting KLK3 radiolabelled with Terbium 161
RAD 402 is a monoclonal antibody targeting Kallikrein
Related Peptidase 3 (KLK3) radiolabelled with the radionuclide 161Tb for the treatment of prostate cancer. In preclinical mouse models,
RAD 402 showed strong tumor targeting, limited bone and marrow uptake, and a hepatic excretion profile consistent with expectations for
a monoclonal antibody.
| · | The Company continues to progress its First-In-Human (FIH) Phase 1 clinical trial of RAD 402, designed to evaluate the safety, tolerability,
whole-body distribution, and preliminary clinical activity of RAD 402 in patients with advanced prostate cancer. The dose escalation Phase
1 study is designed to determine the Maximum Tolerated Dose and recommended Phase 2 dose for expansion. |
Radiopharm Theranostics Limited
Suite 1, Level 3, 62 Lygon
Street, Carlton South VIC 3053 Australia
ABN: 57 647 877 889
ASX
ANNOUNCEMENT
31
July 2026 |
|
 |
Ga68-RAD301 – Peptide targeting αvB-integrin
radiolabeled with Gallium 68
RAD 301 is being evaluated in a Phase 1 imaging trial in patients with Pancreatic Ductal Adenocarcinoma (PDAC). The αvB-integrin
is a cellular marker for tumor invasion and metastatic growth, which correlates with decreased survival in several carcinomas, particularly
pancreatic. RAD 301 has previously received Orphan Drug Designation (ODD) from the FDA and data from the Phase 1 trial is supportive of
the Company’s decision to move to a Phase 2 imaging trial in patients with loco-regional pancreatic cancer.
| · | Enrollment in the Phase 1 imaging trial in metastatic pancreatic cancer continues, having dosed 8 patients out of 9, with last patient
expected to be dosed in 2H 2026. |
Financial Update
Closing cash at the end of the quarter was $4.1 million, decreasing from $19.2 million at the end of the prior quarter.
Net cash outflows from operating activities during the period was $14.97 million with direct Research and Development expenditure and
staff costs accounting for 95% of the operating activities.
Following the close of the quarter, the Company received its FY25 Australian
R&D Tax Incentive of $5.9 million and also completed a $12.5 million institutional offer and launched a $6 million Share Purchase
Plan which is already subscribed for up to $3 million.
In compliance with Listing Rule 4.7C, payments to related parties and their associates,
as detailed in item 6.1 of Appendix 4C, encompass remuneration for director fees to executive and non-executive directors, conducted in
the ordinary course of business at commercial rates, excluding reimbursements for out-of-pocket expenses.
About
Radiopharm Theranostics
Radiopharm
Theranostics is a clinical stage radiotherapeutics company developing a world-class platform of innovative radiopharmaceutical products
for diagnostic and therapeutic applications in areas of high unmet medical need. Radiopharm is listed on ASX (RAD) and on NASDAQ (RADX).
The company has a pipeline of distinct and highly differentiated platform technologies spanning peptides, small molecules and monoclonal
antibodies for use in cancer. The clinical program includes one Phase 2 and five Phase 1 trials in a variety of solid tumor cancers including
lung, breast, and brain metastases. Learn more at radiopharmtheranostics.com.
Authorized
on behalf of the Radiopharm Theranostics Board of Directors by Executive Chairman Paul Hopper.
For
more information:
Investors:
Riccardo
Canevari
CEO
& Managing Director
P: +1 862 309 0293
E:
rc@radiopharmtheranostics.com
Anne
Marie Fields
Precision
AQ (formerly Stern IR)
E:
annemarie.fields@precisionaq.com
Media:
Matt
Wright
NWR
Communications
P: +61 451 896 420
E:
matt@nwrcommunications.com.au
Follow
Radiopharm Theranostics:
Website
– https://radiopharmtheranostics.com/
X
– https://x.com/TeamRadiopharm
LinkedIn
– https://www.linkedin.com/company/radiopharm-theranostics/
Investor Hub – https://investorhub.radiopharmtheranostics.com/
Radiopharm Theranostics Limited
Suite 1, Level 3, 62 Lygon
Street, Carlton South VIC 3053 Australia
ABN: 57 647 877 889
Rule 4.7B
Appendix 4C
Quarterly cash flow report
for entities
subject to Listing Rule 4.7B
| Name of entity |
|
|
| Radiopharm Theranostics Limited |
|
|
| ABN |
|
Quarter ended (“current quarter”) |
| 57 647 877 889 |
|
30 June 2026 |
| Consolidated statement
of cash flows |
Current quarter
$A’000 |
Year to date
(12 months)
$A’000 |
| 1. |
Cash flows from operating activities |
|
|
| 1.1 |
Receipts from customers |
93 |
536 |
| 1.2 |
Payments for |
|
|
| |
(a) research and development |
(12,225) |
(43,381) |
| |
(b) product manufacturing and operating costs |
- |
- |
| |
(c) advertising and marketing |
(56) |
(392) |
| |
(d) leased assets |
- |
- |
| |
(e) staff costs |
(2,335) |
(11,016) |
| |
(f) administration and corporate costs |
(727) |
(4,234) |
| 1.3 |
Dividends received (see note 3) |
- |
- |
| 1.4 |
Interest received |
71 |
485 |
| 1.5 |
Interest and other costs of finance paid |
- |
- |
| 1.6 |
Income taxes paid |
- |
- |
| 1.7 |
Government grants and tax incentives |
- |
4,485 |
| 1.8 |
Other – GST refunded |
207 |
954 |
| 1.9 |
Net cash from / (used in) operating activities |
(14,972) |
(52,563) |
| ASX Listing Rules Appendix 4C (17/07/20) | Page 1 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
Appendix 4C
Quarterly cash flow report for entities subject to Listing Rule 4.7B
| Consolidated statement of cash flows |
Current quarter
$A’000 |
Year to date
(12 months)
$A’000 |
| 2. |
Cash flows from investing activities |
|
|
| 2.1 |
Payments to acquire or for: |
|
|
| |
(a) entities |
- |
- |
| |
(b) businesses |
- |
- |
| |
(c) property, plant and equipment |
- |
- |
| |
(d) investments |
- |
- |
| |
(e) intellectual property |
- |
- |
| |
(f) other non-current assets |
- |
- |
| 2.2 |
Proceeds from disposal of: |
|
|
| |
(a) entities |
- |
- |
| |
(b) businesses |
- |
- |
| |
(c) property, plant and equipment |
- |
- |
| |
(d) investments |
- |
- |
| |
(e) intellectual property |
- |
- |
| |
(f) other non-current assets |
- |
- |
| 2.3 |
Cash flows from loans to other entities |
- |
- |
| 2.4 |
Dividends received (see note 3) |
- |
- |
| 2.5 |
Other - payments of license fee liabilities |
(109) |
(5,421) |
| 2.6 |
Net cash from / (used in) investing activities |
(109) |
(5,421) |
| |
| 3. |
Cash flows from financing activities |
|
|
| 3.1 |
Proceeds from issues of equity securities (excluding convertible debt securities) |
- |
35,263 |
| 3.2 |
Proceeds from issue of convertible debt securities |
- |
- |
| 3.3 |
Proceeds from exercise of options |
- |
- |
| 3.4 |
Transaction costs related to issues of equity securities or convertible debt securities |
- |
(2,109) |
| 3.5 |
Proceeds from borrowings |
- |
- |
| 3.6 |
Repayment of borrowings |
- |
- |
| 3.7 |
Transaction costs related to loans and borrowings |
- |
- |
| 3.8 |
Dividends paid |
- |
- |
| 3.9 |
Other – (provide details if material) |
- |
- |
| 3.10 |
Net cash from / (used in) financing activities |
- |
33,154 |
| ASX Listing Rules Appendix 4C (17/07/20) | Page 2 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
Appendix 4C
Quarterly cash flow report for entities subject to Listing Rule 4.7B
| Consolidated statement of cash flows |
Current quarter
$A’000 |
Year to date
(12 months)
$A’000 |
| 4. |
Net increase / (decrease) in cash and cash equivalents for the period |
|
|
| 4.1 |
Cash and cash equivalents at beginning of period |
19,238 |
29,117 |
| 4.2 |
Net cash from / (used in) operating activities (item 1.9 above) |
(14,972) |
(52,563) |
| 4.3 |
Net cash from / (used in) investing activities (item 2.6 above) |
(109) |
(5,421) |
| 4.4 |
Net cash from / (used in) financing activities (item 3.10 above) |
- |
33,154 |
| 4.5 |
Effect of movement in exchange rates on cash held |
(20) |
(150) |
| 4.6 |
Cash and cash equivalents at end of period |
4,137 |
4,137 |
| 5. |
Reconciliation of
cash and cash equivalents
at the end of the quarter (as shown in the consolidated statement
of cash flows) to the related items in the accounts |
Current quarter
$A’000 |
Previous quarter
$A’000 |
| 5.1 |
Bank balances |
4,137 |
19,238 |
| 5.2 |
Call deposits |
- |
- |
| 5.3 |
Bank overdrafts |
- |
- |
| 5.4 |
Other (provide details) |
- |
- |
| 5.5 |
Cash and cash equivalents at end of quarter (should equal item 4.6 above) |
4,137 |
19,238 |
| 6. |
Payments
to related parties of the entity and their associates |
Current quarter
$A’000 |
| 6.1 |
Aggregate amount of payments to related parties and their associates included in item 1 |
443 |
| 6.2 |
Aggregate amount of payments to related parties and their associates included in item 2 |
|
| Note: if any amounts are shown in items 6.1 or 6.2, your quarterly activity report must include a description of, and an explanation for, such payments. |
In accordance with Listing Rule 4.7C, payments made to related parties and their associates included in items 6.1 of the Appendix 4C includes
compensation and director fee related payments in the normal course of business at commercial rates, excluding reimbursements of out-of-pocket
expenses.
| ASX Listing Rules Appendix 4C (17/07/20) | Page 3 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
Appendix 4C
Quarterly cash flow report for entities subject to Listing Rule 4.7B
| 7. |
Financing facilities
Note: the term “facility’ includes
all forms of financing arrangements available to the entity.
Add notes as necessary for an understanding of the
sources of finance available to the entity. |
Total facility
amount
at quarter end
$A’000 |
Amount drawn
at quarter end
$A’000 |
| 7.1 |
Loan facilities |
- |
- |
| 7.2 |
Credit standby arrangements |
- |
- |
| 7.3 |
Other (please specify) |
- |
- |
| 7.4 |
Total financing facilities |
- |
- |
| |
| 7.5 |
Unused financing facilities available at quarter end |
- |
| 7.6 |
Include in the box below a description of each facility above, including the lender, interest rate, maturity date and whether it is secured or unsecured. If any additional financing facilities have been entered into or are proposed to be entered into after quarter end, include a note providing details of those facilities as well. |
| |
N/A |
| 8. |
Estimated
cash available for future operating activities |
$A’000 |
| 8.1 |
Net cash from / (used in) operating activities (item 1.9) |
(14,972) |
| 8.2 |
Cash and cash equivalents at quarter end (item 4.6) |
4,137 |
| 8.3 |
Unused finance facilities available at quarter end (item 7.5) |
- |
| 8.4 |
Total available funding (item 8.2 + item 8.3) |
4,137 |
| |
| 8.5 |
Estimated quarters of funding available (item 8.4 divided by item 8.1) |
0.28 |
| Note: if the entity has reported positive net operating cash flows in item 1.9, answer item 8.5 as “N/A”. Otherwise, a figure for the estimated quarters of funding available must be included in item 8.5. |
| 8.6 |
If item 8.5 is less than 2 quarters, please provide answers to the following questions: |
| |
8.6.1 Does the entity expect that it will continue to have the current
level of net operating cash flows for the time being and, if not, why not? |
| Answer: | No. The Company does not expect the current quarter’s net operating
cash outflow of A$14.97 million to be representative of its go-forward burn profile. Three specific factors elevated Q4 FY2026 operating
outflows and are expected to moderate during Q1 FY2027 and beyond: |
| 1) | Accelerated
clinical milestone investment. Direct research and development expenditure (A$12.23 million)
and staff costs (A$2.34 million) together represented 95% of operating spend. This reflects
deliberate, time-bound investment aligned to specific value-inflecting milestones achieved
during and shortly after the quarter, including: |
| - | Partial Response in Phase 1 Trial of RAD204 |
| | | |
| - | Positive Phase 2b trial results of RAD101 |
| | | |
| - | Initial Findings from Phase 1 177Lu-RAD202 Trial |
| ASX Listing Rules Appendix 4C (17/07/20) | Page 4 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
Appendix 4C
Quarterly cash flow report for entities subject to Listing Rule 4.7B
| 8.6.2 | Has the entity taken any steps, or does it propose to take any
steps, to raise further cash to fund its operations and, if so, what are those steps and how likely does it believe that they will be
successful? |
Answer: The Board is continuing to assess alternative capital sources, and the Directors believe that the Company can raise sufficient
capital in the form of equity financing and or non-dilutive inflows. In December 2025 a At-The-Market Facility was set up to allow the
company to draw upon US$18.9 million for the issue of ADR’s.
Subsequent to 30 June 2026, the Company received its FY25 Australian R&D Tax Incentive of $5.9 million and also completed a $12.5
million institutional offer and launched a $6 million Share Purchase Plan which is already subscribed for up to $3 million.
In addition, the Company has and will continue to employ cash management strategies such as delaying discretionary operating activities.
| 8.6.3 | Does the entity expect to be able to continue its operations
and to meet its business objectives and, if so, on what basis? |
Answer: Yes, the Board expects to be able to continue its operations and to meet its business objectives based on the responses detailed
in 8.6.1 and 8.6.2.
Note: where item 8.5 is less than 2 quarters, all of questions 8.6.1,
8.6.2 and 8.6.3 above must be answered.
| ASX Listing Rules Appendix 4C (17/07/20) | Page 5 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
Appendix 4C
Quarterly cash flow report for entities subject to Listing Rule 4.7B
Compliance statement
| 1 | This statement has been prepared in accordance with accounting
standards and policies which comply with Listing Rule 19.11A. |
| 2 | This statement gives a true and fair view of the matters disclosed. |
| Date: |
31 July 2026 |
|
| |
|
| Authorised by: |
The Board |
|
| |
|
|
| |
(Name of body or officer authorising release
– see note 4) |
Notes
| 1. | This quarterly cash flow report and the accompanying activity
report provide a basis for informing the market about the entity’s activities for the past quarter, how they have been financed
and the effect this has had on its cash position. An entity that wishes to disclose additional information over and above the minimum
required under the Listing Rules is encouraged to do so. |
| 2. | If this quarterly cash
flow report has been prepared in accordance with Australian Accounting Standards, the definitions
in, and provisions of, AASB 107: Statement of Cash Flows apply to this report. If
this quarterly cash flow report has been prepared in accordance with other accounting standards
agreed by ASX pursuant to Listing Rule 19.11A, the corresponding equivalent standard applies
to this report. |
| 3. | Dividends received may be classified either as cash flows from
operating activities or cash flows from investing activities, depending on the accounting policy of the entity. |
| 4. | If this report has been
authorised for release to the market by your board of directors, you can insert here: “By
the board”. If it has been authorised for release to the market by a committee of your
board of directors, you can insert here: “By the [name of board committee –
eg Audit and Risk Committee]”. If it has been authorised for release to the market
by a disclosure committee, you can insert here: “By the Disclosure Committee”. |
| 5. | If this report has been
authorised for release to the market by your board of directors and you wish to hold yourself
out as complying with recommendation 4.2 of the ASX Corporate Governance Council’s
Corporate Governance Principles and Recommendations, the board should have received
a declaration from its CEO and CFO that, in their opinion, the financial records of the entity
have been properly maintained, that this report complies with the appropriate accounting
standards and gives a true and fair view of the cash flows of the entity, and that their
opinion has been formed on the basis of a sound system of risk management and internal control
which is operating effectively. |
| ASX Listing Rules Appendix 4C (17/07/20) | Page 6 |
| + See chapter 19 of the ASX Listing Rules for defined terms. | |
