July 3 (Reuters) - AstraZeneca (AZN.L) said on Monday an experimental precision drug slowed progression of lung cancer in a late-stage trial, but the company's shares fell as much as 6% as analysts said the benefits may not be as pronounced as hoped. It declined to provide more trial details, saying they would be presented at an as yet undisclosed medical conference. At 0855 GMT, shares in AstraZeneca were down 5.8% at their lowest level in more than three months. Gilead (GILD.O) has pioneered the targeting of TROP2 with an ADC named Trodelvy, approved to treat certain types of breast and bladder cancer. AstraZeneca said that the datopotamab deruxtecan trial would continue as planned to assess the effect of the drug on overall survival of patients, another important efficacy criterion.

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Persons: datopotamab, AstraZeneca, British drugmaker, Kelun, Maggie Fick, Ludwig Burger, Sinchita Mitra, Lucy Raitano, Krishna Chandra Eluri, Susan Fenton Organizations: AstraZeneca, Japan's, Merck & Co, Biotech of, Barclays, Thomson Locations: British, Biotech of China, London, Frankfurt, Bengaluru