Price P J, Gregory E A, Skeen P C
Cancer Lett. 1978 Dec;5(6):345-9. doi: 10.1016/s0304-3835(78)80061-5.
Ritalin (methylphenidate hydrochloride), Benzedrine (amphetamine sulfate), and Dexedrine (dextroamphetamine sulfate) were examined for oncogenicity using a serial line of Fischer rat embryo cells, which was previously shown to be a sensitive and accurate indicator of chemicals carcinogenic for rodents. At the concentrations tested, none of the 3 drugs induced transformation in Fischer rat embryo cells.