There are 3 studies that match your criteria.
Criteria: Freq Range=300 kHz - 300 GHz (RF/mmW/THz),Study Type=In Vivo,Study Subtype=Long Term Animal Bioassay,Status=Completed Without Publication

Details - Project ID 261
Lab	Private University of Witten/Herdecke, FRG
Study Design	900, 1800 MHz (GSM) exposure to rabbits and analysis of pathology
Summary	No effecs on melatonin levels, body weight, mobility, behavior, food consumption, or litter size
Citation
Details - Project ID 388
Lab	Fraunhofer Institute, FRG
Study Design	900 MHz (CW, GSM) exposure tp CBA/S mice and analysis of cancer and pathology (X-ray initiated lymphoma bioassay)
Summary	No effects on lymphoma incidence or mortality, and no effects on melatonin levels
Citation
Details - Project ID 1230
Lab	Dicle University, Turkey
Study Design	900 MHz (GSM) exposure to rats and analysis of gross tissue pathology using electron microscopy
Summary	Changes in cellular structure of brain, heart, testes and liver tissues
Citation