Because cancer tends to be life threatening and because delays in treatment may reduce the likelihood of successful treatment, cancer is usually treated the same way whether the woman is pregnant or not. Some of the usual treatments (surgery, chemotherapy drugs, and radiation therapy) may harm the fetus. Thus, some women may consider abortion. However, treatments can sometimes be timed so that risk to the fetus is reduced.
In some cancers (such as rectal and gynecologic cancers Overview of Female Reproductive System Cancers Cancers can occur in any part of the female reproductive system—the vulva, vagina, cervix, uterus, fallopian tubes, or ovaries. These cancers are called gynecologic cancers. The most common... read more ), treatment may be modified during pregnancy.
Rectal cancer Colorectal Cancer Family history and some dietary factors (low fiber, high fat) increase a person’s risk of colorectal cancer. Typical symptoms include bleeding during a bowel movement, fatigue, and weakness... read more may require removal of the uterus (hysterectomy) to be sure that all the cancer is removed. In such cases, cesarean delivery may be done as early as 28 weeks of pregnancy so that hysterectomy can be done and aggressive cancer treatment can be started.
Pregnancy does not appear to worsen cervical cancer Cervical Cancer Cervical cancer develops in the cervix (the lower part of the uterus). Cervical cancer usually results from infection with the human papillomavirus (HPV), transmitted during sexual intercourse... read more .
If pregnant women have an abnormal Papanicolaou (Pap) test, doctors examine the cervix with a binocular magnifying lens (colposcopy Colposcopy Sometimes doctors recommend screening tests, which are tests that are done to look for disorders in people who have no symptoms. If women have symptoms related to the reproductive system (gynecologic... read more ). Colposcopy does not harm the fetus or affect the pregnancy. Doctors usually consult an expert when doing the colposcopy to help them determine whether they should take a sample of any abnormal tissue to be examined under a microscope (biopsy Cervix or vagina Sometimes doctors recommend screening tests, which are tests that are done to look for disorders in people who have no symptoms. If women have symptoms related to the reproductive system (gynecologic... read more ). A cervical biopsy is not routinely done in pregnant women because bleeding and preterm labor are risks.
If cervical cancer is in a very early stage, treatment is usually postponed until after delivery.
If more advanced cervical cancer is detected early in pregnancy, it is usually treated immediately as needed.
If it is diagnosed late in pregnancy, doctors explain the risk of postponing treatment so that women can decide whether to postpone treatment until after the fetus is mature enough to be delivered. However, if cancer is advanced, cesarean delivery is done, followed by hysterectomy.
Other gynecologic cancers
Cancer of the ovaries Ovarian Cancer Ovarian cancer, which typically starts on the surface of the ovaries, is not usually diagnosed until it is advanced. Ovarian cancer may not cause symptoms until it is large or has spread. If... read more is hard to detect during pregnancy. It may require immediate treatment (removal of both ovaries).
Cancer of the uterus Cancer of the Uterus Cancer of the uterus develops in the lining of the uterus (endometrium) and is thus also called endometrial cancer. Endometrial cancer usually affects women after menopause. It sometimes causes... read more (endometrial cancer) or cancer of the fallopian tubes Fallopian Tube Cancer Fallopian tube cancer develops in the tubes that lead from the ovaries to the uterus. Most cancers that affect the fallopian tubes have spread from other parts of the body. At first, women may... read more rarely occurs during pregnancy.
Breast cancer Breast Cancer Breast cancer occurs when cells in the breast become abnormal and divide uncontrollably. Breast cancer usually starts in the glands that produce milk (lobules) or the tubes (ducts) that carry... read more is hard to detect during pregnancy because the breasts enlarge. If any lump is detected, doctors evaluate it.
Usually, breast cancer should be treated immediately.
Leukemia and Hodgkin lymphoma
Leukemia Leukemias read more and Hodgkin lymphoma Hodgkin Lymphoma Hodgkin lymphoma is a type of lymphoma distinguished by the presence of a particular kind of cancer cell called a Reed-Sternberg cell. The cause is unknown. Lymph nodes enlarge but are usually... read more are uncommon during pregnancy. The anticancer drugs typically used to treat these cancers increase the risk of miscarriage and birth defects.
Because leukemias can become fatal rapidly, women are treated as soon as possible, without waiting to allow the fetus to mature.
If Hodgkin lymphoma is present only in areas above the diaphragm (the muscle that separates the chest from the abdomen), radiation therapy may be used, and the abdomen is shielded to protect the fetus from radiation. If lymphoma is present in areas below the diaphragm, doctors may recommend abortion.