A personalized cancer treatment from Moderna and Merck moved closer to possible regulatory review after the companies announced on August 19, 2026, that their Phase 3 melanoma trial met two key endpoints. But intismeran is still investigational: the announcement did not establish approval or general availability, and it did not disclose the Phase 3 effect sizes.
What is Moderna and Merck’s cancer vaccine?
Intismeran autogene—also called intismeran, V940 or mRNA-4157—is an investigational, personalized mRNA-based treatment jointly developed by Moderna and Merck. It is designed from mutations identified in a patient’s tumor, with the aim of prompting the immune system to recognize and attack cancer cells. It is being studied with pembrolizumab, Merck’s anti-PD-1 medicine sold as KEYTRUDA.
Calling it a “cancer vaccine” can be misleading without that context. This is not a shot intended to prevent cancer in healthy people. The Phase 3 melanoma trial studied it as adjuvant treatment—treatment given after surgery—when the tumor had been removed but the risk of cancer returning remained.
What did the Phase 3 melanoma trial find?
On August 19, 2026, Moderna and Merck announced that the Phase 3 INTerpath-001 study met its primary endpoint, recurrence-free survival, and a key secondary endpoint, distant metastasis-free survival. At a prespecified interim analysis, the companies said intismeran plus KEYTRUDA produced statistically significant and clinically meaningful improvements compared with KEYTRUDA alone.
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The trial enrolled people with completely resected stage IIB, IIC, III or IV cutaneous melanoma who had not received prior systemic therapy. The announcement did not report hazard ratios or absolute recurrence-free or distant metastasis-free survival rates, so it is not possible from that release to quantify the size of the Phase 3 benefit for patients.
Overall survival was still being evaluated. The companies said the safety profiles were consistent with earlier combination studies and that they had observed no new safety signals, but the topline announcement did not include detailed Phase 3 adverse-event tables. It said the results would be presented at an upcoming international medical meeting and shared with regulators; it did not announce a regulatory decision.
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How does that compare with the earlier Phase 2 results?
Earlier findings offer context, but they are not the Phase 3 result. In the Phase 2b KEYNOTE-942/mRNA-4157-P201 study, 157 people with resected high-risk stage III or IV melanoma received the combination or KEYTRUDA alone. Merck and Moderna reported the following results at approximately 34.9 months’ median follow-up:
| Phase 2b measure | Combination versus KEYTRUDA alone | What the figure means |
|---|---|---|
| Risk of recurrence or death | 49% lower | Relative reduction reported by the companies; not an absolute percentage-point reduction in recurrence. |
| Risk of distant metastasis or death | 62% lower | Relative reduction reported by the companies. |
| Recurrence-free survival at 2.5 years | 74.8% versus 55.6% | Reported rates for the combination and KEYTRUDA alone, respectively. |
Moderna’s 2025 Form 10-K, filed in 2026, said that at a planned median follow-up of approximately five years, the Phase 2b combination continued to show a 49% reduction in the risk of recurrence or death versus KEYTRUDA alone. That longer follow-up is also Phase 2b evidence. None of these figures should be presented as the undisclosed effect size from the 2026 Phase 3 announcement.
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Is Moderna’s cancer vaccine available yet?
The available company announcements describe intismeran as investigational. The August 2026 release says the Phase 3 data would be shared with regulatory authorities; it does not say that an application has been accepted or that the treatment has been approved. The evidence described here therefore does not establish access outside a clinical trial. Regulatory and trial status can change, so patients should check current regulator and trial records with their oncology team.
Which cancers could the treatment be studied for?
The positive Phase 3 announcement is specific to adjuvant treatment after surgery for high-risk cutaneous melanoma. Moderna’s pipeline, dated May 28, 2026, listed intismeran in Phase 3 for adjuvant melanoma and several non-small cell lung cancer (NSCLC) settings. It also listed Phase 2 studies in renal cell carcinoma, muscle-invasive and non-muscle-invasive bladder cancer, metastatic melanoma, and first-line metastatic squamous NSCLC, plus Phase 1 studies in early and advanced solid tumors.
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These entries describe where the program was being studied, not proven benefit in those cancers. A result in resected melanoma cannot be assumed to apply to lung, bladder, kidney or other cancers; each setting requires evidence from its own trials.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should patients take from the announcement?
- The Phase 3 result is a company-announced topline finding for a specific group: people with completely resected, high-risk cutaneous melanoma receiving adjuvant treatment.
- The companies reported improved recurrence-free and distant metastasis-free survival compared with KEYTRUDA alone, but did not publish the Phase 3 effect sizes in the announcement.
- Overall survival and detailed Phase 3 safety results were not yet reported there.
- The treatment remains investigational in the sources described here; the announcement is not evidence of approval or general availability.
When fuller results are reported, the most useful comparisons will include the absolute survival rates as well as relative-risk measures, follow-up duration, adverse events and the maturity of overall-survival data. Those details help show how large and durable a benefit may be, beyond whether a trial met a statistical endpoint.
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