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If you were wondering why Novartis (NVS) waited more than three months to notify the Food and Drug Administration about manipulated data for its pricey gene therapy, the answer is … the situation was complicated.

That, anyway, is the message delivered to the agency last month after the crisis erupted.

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In an Aug. 23 letter to the agency, the executives who run AveXis — the Novartis unit at the center of the data scandal — went into copious detail about the effort to recount actions the company took upon learning about problems with a preclinical test known as a mouse assay. But they blamed the “highly complex” nature of their internal investigation for failing to tell the FDA about the problem any sooner.

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