Overall, they include drugs that have long been abused, such as marijuana and cocaine, and drugs whose abuse is a more recent development. Some are stimulants, some depressants, and some hallucinogens-while most exhibit multiple pharmacological properties.
Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, [1] and may be linked to breast cancer. PCBs are known to cause a variety of types of cancer in rats, mice, and other study animals. [2].
The primary causes of cervical cancer are HPV types 16 and 18. Even though a Pap smear doesnât test for HPV, it identifies cellular changes caused by the virus. By detecting cervical cancer cells early with a Pap smear, treatment can start before it spreads and becomes a bigger problem.