Plan allocation before treatment
Define blocks or strata before randomization, preserve an allocation record and avoid changing the scheme after outcomes are visible.
PRECLINICAL · TIME-TO-EVENT
Survival & preclinical analysis hub
Plan groups, summarize longitudinal response and interpret time-to-event data with the assumptions and risk sets kept visible.
For in-vivo pharmacology, oncology and translational research teams.FROM INPUT TO INTERPRETATION
A four-step, reviewable workflow.
The sequence is a practical guide, not a substitute for a study-specific protocol.
Animal-study randomization →
Normalize dose preparation
Translate target dose and body weight into practical preparation volumes while checking concentration and route-specific limits.
Summarize longitudinal tumor response
Keep baseline definition, measurement schedule and analysis rule consistent when calculating T/C or tumor-growth inhibition.
Estimate time-to-event curves
Define the time origin and event carefully, retain censoring status and inspect the number at risk—especially in the tail.
INTERPRETATION GUARDRAILS
What matters beyond the formula.
Prespecify the event
The event definition, time origin, censoring rule and analysis population should be defined before viewing the comparison.
Show the risk set
Late sections of a Kaplan-Meier curve can look stable even when very few subjects remain under observation.
Do not confuse planning with validation
A browser calculator can support review and exploration; regulated or confirmatory analysis needs the approved statistical environment.
Common interpretation questions.
What does censoring mean on a Kaplan-Meier curve?
It indicates that the exact event time was not observed after a known follow-up time. Censored subjects contribute to the risk set until that time.
Can median survival always be reported?
No. If the estimated survival curve does not cross 50%, the median is not reached within the observed follow-up.
Why can the end of the curve be misleading?
The estimate becomes unstable when only a small number remains at risk. Always inspect risk counts and censoring patterns.
SELECTED REFERENCES
Start with the method source.
References inform this workflow and do not imply endorsement of Tossora Lab.
Source-informed and internally checked. Independent scientific or regulatory validation is not claimed.
How we review and correct content →