They say they have known for a number of years that some medicines utilized for schizophrenia and hypertension stop the sperm from reaching the male organ by stopping the sperm passing from the testes and out of the male organ. Related StoriesINVO Bioscience obtains de novo clearance from FDA for INVOcell fertility treatmentStudy shows restoring testosterone production in men does not impact their fertilityNew paper device could rapidly and inexpensively assess hepatitis B, male infertilityThey have now isolated the chemical which has this effect and plan to test drive it initially on animals.However, the writer of an editorial in the same issue suggests that certain biases often found in breast cancer screening studies should be considered when interpreting the results of the study. Because mammography increases the detection rate of early-stage breast cancers, the incidence of late-stage breasts cancers should decline. However, despite high levels of screening in the overall population, late-stage breasts cancers still occur. The occurrence of late-stage breast cancers could indicate failures in the screening procedure. To establish where the screening process breaks down and where changes in care may possess the greatest impact, Stephen H. Taplin, M.D., M.P.H.5 million women aged 50 years and older who had access to screening mammography.