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From a poster to a clinical trial:

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I can understand that q3w means "once every 3 weeks", but what is the meaning of D1? I think the first DI must be a typo and it stands for D1 too.

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DI stands for diachronic:

Diachronic: Over a period of time. The opposite of synchronic.

This would indicate that the medication is given in a drip, not as a bolus.

D1 seems to not have any standard meaning, the conclusion this answerer draws is that D1 is a probable transcription substitution for DI.

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