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Moderna shares plunge as leaked cancer vaccine data disappoints

The Australian Financial Review (AFR) •
October 22, 2026 • 10:39 PM
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The data leak on a melanoma vaccine undermined the lofty expectations set by Wall Street earlier this year.

Moderna shares plunge as leaked cancer vaccine data disappoints

New York | Moderna and Merck shares plummeted after data on the companies’ widely anticipated personalised melanoma vaccine wasn’t enough to prove to investors that a new era of cancer treatments has arrived.

The companies had initially announced in August that the bespoke vaccine led to a significant and clinically meaningful reduction in the recurrence of deadly tumours, sending shares of both companies soaring.

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