Doctor insights on:
Why Is Cystic Fibrosis More Common In Caucasians
Gene defect: Parents of one CF patient have an equal (25%)chance of producing another with every conception. Although there is a possibility that an unaffected child would be born, you roll the dice every time. ...Read more
Caucasian, to most people, means a white person. But by the racial classification made in the 19th century, it ranged from people with light skin (no. Europe) to darker (parts of no. Africa & india). These people were felt to be originally from the caucases region of southeastern europe. At it's current core meaning, it is a white person, or ...Read more
Recessive gene: A mutation is carried in the dna of both unaffected parents & that matching or similar mutation is paired up at conception when the sperm & egg form completed chromasomes with the defective info. Late in pregnancy and after delivery, the effect of the CF gene abnormality begins to reveal itself. In carriers, the good gene compensates for the bad & no problems occur. ...Read more
Help docs? Why is osteosarcomas more common in children, but colon cancer is more common in the elderly?
Cancers: A very interesting question. Childhood cancers are different than cancers occurring in adulthood. Childhood cancers occur in developing or maturing organs such as bone is affected as matures to adulthood. Adult tumors such as colon cancer occurs after the organ had undergone insults of one kind or another. ...Read more
Why cystic fibrosis only affects the caucasian population and how the disease may have originated?
not true: Cystic fibrosis is a metabolic disorder more common in caucasions by present in many populations.The incidence is 1/3500 caucasion, 1/17, 000 african american, 1/80, 000 native american. It arises in mutations in the cftr gene that regulates cellular transport of chloride.There are in excess of 700 known mutations recorded but most common is the delta 508. ...Read more
Old Days: Back in the "old days, " patients with CF would frequently die, and the autopsy findings of the lungs showed scarring ("fibrosis") and bubbles ("cysts, " "cystic"). Thus, it was called cystic fibrosis. We know much more now about this disease, but the old name stuck. ...Read moreSee 1 more doctor answer
Why is huntington's disease more common in people of western european descent than in other races?
Time of exposure: Most bladder cancers in the usa are likely a result of long term exposure of the urothelial lining of the urinary tract to water soluble toxins (eg, from smoking). The barrage of carcinogenic chemicals over time can result in tumorigenesis and thus with age the risk of such cancers increases in typical dose-response fashion. ...Read moreSee 1 more doctor answer
X-linked recessive: Ordinary men and Turner women have only one X-chromosome. Ordinary women and Klinefelter men have two X-chromosomes. A person needs one normal X-chromosome to not have hemophilia. This is basic biology and I'm glad you're asking -- this should be essential knowledge to anyone living in the 21st century. ...Read more
Sexual Difference: Part of the reason is genetic differences between men and women Women typically display greater levels of some antigens in triggering auto immunity ...Read more
We don't know: The truth is we really do not know why. Hormonal differences and other suggestions have been offered as explanations but none have been proven. ...Read more
Generally, yes.: at least 50% of patients with IBS reported having had their first symptoms prior to age 35. The prevalence is 25% lower in patients who were 50 years age or older. This suggests that symptoms in some patients may improve over time. It is also about twice is common in women as in men. Good luck. ...Read more
Is vaginal cancer that grows slowing more common in young or old women?Thanks ps: i know that in generally vaginal cancer is more common in old women
When babies are born, are they screened for cystic fibrosis? Also, can a chest xray indicate cystic fibrosis in the lungs?
Depends: The specifics of newborn screening are defined on a state to state basis. Many states screen for CF, but this was not added to the screening in my state until about 10 years ago. The x-ray changes that may be seen in some older CF patients are not present in early childhood and not specific to the disease when they are seen. ...Read moreSee 1 more doctor answer
- Talk to a doctor live online for free
- Why is it called cystic fibrosis?
- How common are false positives with cystic fibrosis tests?
- Integumentary system and cystic fibrosis
- Ask a doctor a question free online
- Why does cystic fibrosis shorten life span?
- Cystic fibrosis
- Why do people with cystic fibrosis have unusually salty sweat?
- Why do people with cystic fibrosis have salty skin?
- Talk to a pediatrician online