From a poster to a clinical trial:
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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D1 means on day one of the three weekly cycles. DI is a typo.
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.