08/28/2015 06:03 EDT | Updated 08/28/2016 01:12 EDT

Swedish university clears doctor who made wind pipes with stem cells of scientific misconduct

LONDON — Sweden's Karolinska Institute says a leading stem cell scientist accused of unethical behaviour has been cleared of scientific misconduct though he sometimes acted without due care.

In a statement released on Friday, the university said complaints levelled against Dr. Paolo Macchiarini — who has created wind pipes using patients' stem cells — did not qualify as scientific misconduct, overturning a previous investigation in May which found him guilty.

After examining further documents submitted by Macchiarini, Karolinska's vice-chancellor Anders Hamsten concluded there were flaws in Macchiarini's work "but nothing that can be considered scientific misconduct."

Macchiarini has been instructed to submit corrected information to the journals that published some of his work to clarify the mistakes identified by the university's inquiry.

The Associated Press

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