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Persly Research for medical affairs

See whether your drug is usedthe way it was approved

Why patients stopped and switched, in real-world data.

Why did patients stop Keytruda?

Backed by

  • KHIDI
  • NAVER D2SF
  • Seoul AI Hub
  • TIPS
  • Antler

See how the drug is actually used

See what the chart actually holds. Treatment conditions and lab values, the complications that followed, how surgery turned out, and why the clinician chose what they chose.

  • See whether it is used as intended

    Lab values at the time of dosing, what else the patient was taking, and at what dose. The full context of real-world treatment patterns.

    Is Keytruda dosed per the label?

    Keytruda label dosage and administrationKeytruda label.pdf
    Labeled dose68%
    Reduced dose21%
    Low hepatic and renal values at dosing
    Interval adjusted11%
    Blood counts slow to recover after the prior cycle

    Illustrative label comparison

  • See whether it actually worked

    How lab values moved after treatment, and what set apart the patients who responded.

    BaselineDose3 mo6 mo
    RespondersNon-responders

    Illustrative change in lab values

  • Trace why treatment stopped

    Side effects, the lab values at the point of worsening, and the patterns they share.

    Adverse events38%
    Lack of efficacy27%
    Patient circumstances14%
    Not recorded21%

    Illustrative mix of reasons

Frequently asked questions

Is IRB review not required?
The exploratory stage runs without review. Results are de-identified and counts for very small groups are not shown, so it does not constitute research using identifiable information. Once you settle on a hypothesis and move to the study itself, IRB approval is required.
Is patient personal information visible?
No. Every identifier is removed before analysis, counts for very small groups are not shown, and only the minimum clinically meaningful information is used.
Can results be used for publications or regulatory submissions as is?
Not as is. Once you have IRB approval, you can review the de-identified source records behind a finding and use them either as a citation in your paper or as supporting material in a regulatory filing. We help you prepare for that review.