Penn Arts & Sciences Logo

Bi-College Math Colloquium

Monday, March 14, 2022 - 4:30pm

Karen Kafadar

University of Virginia


Haverford College

Hilles 109

Join us at Haverford College for a talk by Karen Kafadar, Commonwealth Professor and Chair of Statistics at University of Virginia.

Cancer screening is assumed to be beneficial, in terms of reduced mortality and extended survival. Screen-detected survival, when measured as the time between clinical detection of disease and endpoint (cure or death), can be biased by lead time (time by which the screening test advances the time of clinical diagnosis), length biased sampling (probability of detection depends on length), and overdiagnosis (cases that would never have surfaced in the absence of screening). We quantify these effects in this talk and illustrate their non-trivial impacts on the results from actual randomized cancer screening trials. The concepts apply to general periodic screening programs for other conditions and devices. This work is performed in collaboration with Dr. Philip C. Prorok, National Cancer Institute.