Reaction

Contralateral Breast Cancer reporting signals

Last recalculated 2026-09-14T18:28:35.993900+00:00 · 206 reports · 4 co-occurring drugs

As of the last recalculation, Contralateral Breast Cancer appears in 206 FAERS reports alongside 4 co-occurring drug terms. The strongest observed disproportionality signal is CONJUGATED ESTROGENS AND MEDROXYPROGESTERONE ACETATE (PRR 683.4).

Important: FAERS is a spontaneous, voluntary, unverified reporting system. PRR and ROR identify reporting patterns for investigation; they are not incidence rates and do not establish causation.

Drug	Co-reports	PRR	ROR
Conjugated Estrogens And Medroxyprogesterone Acetate	90	683.4	686.0
Conjugated Estrogens	133	648.7	650.2
Estrogens, Conjugated	133	636.9	638.3
Medroxyprogesterone Acetate	102	408.7	409.6

Related reactions

Drug Ineffective
Off Label Use
Death
Nausea
Fatigue

Data source: openFDA FAERS. See the OpenPV methodology and limitations.