We aimed to provide comprehensive protocols and promote effective management of pregnant women with gynecological cancers. New insights and more experience have been gained since the previous guidelines were published in 2014. Members of the International Network on Cancer, Infertility and Pregnancy (INCIP), in collaboration with other international experts, reviewed existing literature on their respective areas of expertise. Summaries were subsequently merged into a manuscript that served as a basis for discussion during the consensus meeting. Treatment of gynecological cancers during pregnancy is attainable if management is achieved by collaboration of a multidisciplinary team of health care providers. This allows further optimization of maternal treatment, while considering fetal development and providing psychological support and long-term follow-up of the infants. Nonionizing imaging procedures are preferred diagnostic procedures, but limited ionizing imaging methods can be allowed if indispensable for treatment plans. In contrast to other cancers, standard surgery for gynecological cancers often needs to be adapted according to cancer type and gestational age. Most standard regimens of chemotherapy can be administered after 14 weeks gestational age but are not recommended beyond 35 weeks. C-section is recommended for most cervical and vulvar cancers, whereas vaginal delivery is allowed in most ovarian cancers. Breast-feeding should be avoided with ongoing chemotherapeutic, endocrine or targeted treatment. More studies that focus on the long-term toxic effects of gynecologic cancer treatments are needed to provide a full understanding of their fetal impact. In particular, data on targeted therapies that are becoming standard of care in certain gynecological malignancies is still limited. Furthermore, more studies aimed at the definition of the exact prognosis of patients after antenatal cancer treatment are warranted. Participation in existing registries (www.cancerinpregnancy.org) and the creation of national tumor boards with multidisciplinary teams of care providers ( supplementary Box S1, available at Annals of Oncology online) is encouraged.

Breast cancer is the most common malignancy occurring during pregnancy. Because more women delay childbearing, the diagnosis of cancer during pregnancy will likely increase. Case reports exist in the literature regarding the treatment of pregnant women with breast cancer, but few are prospective and few provide long-term follow-up on the neonate exposed to chemotherapy. In this report, 130 women diagnosed with breast cancer were reported to our voluntary national registry and followed up prospectively. The Cancer and Pregnancy Registry is a voluntary registry that monitors the clinical course, treatment, and disease outcome of women diagnosed with cancer during pregnancy and the perinatal and neonatal outcomes of their children. Of the 130 diagnosed, 120 were diagnosed with a primary tumor, 8 with a recurrence, and 2 with a new primary cancer. Mean maternal age at diagnosis was 34.8 +/- 4.2 years. Mean gestational age at diagnosis was 13.2 +/- 8.1 weeks. Gestational age was 12.8 +/- 7.8 weeks for patients with primary disease and 16.25 +/- 11 weeks for those with recurrent cancer. One hundred thirteen women were followed up for mean of 3.14 +/- 2.5 years. Of those followed up, 103 were diagnosed with primary breast cancer during pregnancy, 8 with a recurrence, and 2 with a new primary. Recurrence was reported in 30 patients at an average of 16.2 +/- 10.8 months from delivery to recurrence. Twenty-one patients are deceased with an average of 24.71 +/- 15.32 months from delivery to death. Only 42% were diagnosed with an estrogen-positive tumor and 35% of cases had a progesterone receptor-positive tumor. Human epidermal growth factor receptor 2 was positive in 25% of patients. Chemotherapy was given during pregnancy in 104 cases; the first treatment was given at a mean gestational age of 20.4 +/- 5.4 weeks. The malformation rate of exposed neonates was 3 not greater than the general population. Survival by stage for a primary diagnosis in pregnancy is as follows: stage I, 100%; stage II, 86%; stage III, 86%; and stage IV, 0%. Pregnant women diagnosed with breast cancer can receive treatment comparable with nonpregnant women leading to a similar survival when matched for stage at diagnosis. The majority of children who were exposed to chemotherapy in utero did not demonstrate significant complications. We report the single largest cohort of women diagnosed with breast cancer during pregnancy.

Because of few cases at any 1 institution, pooling information on the treatment of pregnant women diagnosed with cancer and long-term follow-up of their children is important. Women diagnosed with cancer between their last menstrual period and end of pregnancy were voluntarily enrolled in the Cancer and Pregnancy Registry. Details of cancer treatment and pregnancy outcomes were collected. Neonatal follow-up is obtained yearly. Two hundred thirty-one women were enrolled over a 13-year period. Thirteen women elected termination. One hundred fifty-seven neonates were exposed to chemotherapy in utero. Mean gestational age at delivery for neonates exposed to chemotherapy was 35.8 +/- 2.8 weeks, mean birth weight was 2647 +/- 713 g. Six children (3.8%) were born with a congenital anomaly. An intrauterine fetal demise and a neonatal death occurred in 1 case each (0.7% in each). In 12 cases (7.7%), the neonate measured <10% for gestational age at birth. Nine cases (5.8%) delivered spontaneously premature. Sixty-seven women did not receive chemotherapy during pregnancy and delivered 70 neonates. The mean gestational age at delivery was 36.5 +/- 3.3 weeks, mean birth weight was 2873 +/- 788 g. Mean neonatal follow-up is 3 years postpartum and is provided by cancer type and chemotherapy regimen. In pregnancies exposed to chemotherapy after the first trimester, congenital anomalies, preterm delivery, and growth restriction were not increased as compared with general population norms. Mean gestational age at delivery was not significantly different than neonates who were not exposed to chemotherapy. There was a statistical significant difference in the birth weight between groups, which may not be clinically significant.

Purpose of Review: Cancer diagnosis in young pregnant women challenges oncological decision-making. The International Network on Cancer, Infertility and Pregnancy (INCIP) aims to build on clinical recommendations based on worldwide collaborative research. Recent Findings: A pregnancy may complicate diagnostic and therapeutic oncological options, as the unborn child must be protected from potentially hazardous exposures. Pregnant patients should as much as possible be treated as non-pregnant patients, in order to preserve maternal prognosis. Some approaches need adaptations when compared with standard treatment for fetal reasons. Depending on the gestational age, surgery, radiotherapy, and chemotherapy are possible during pregnancy. A multidisciplinary approach is the best guarantee for experience-driven decisions. A setting with a high-risk obstetrical unit is strongly advised to safeguard fetal growth and health. Research wise, the INCIP invests in clinical follow-up of children, as cardiac function, neurodevelopment, cancer occurrence, and fertility theoretically may be affected. Furthermore, parental psychological coping strategies, (epi)genetic alterations, and pathophysiological placental changes secondary to cancer (treatment) are topics of ongoing research. Summary: Further international research is needed to provide patients diagnosed with cancer during pregnancy with the best individualized management plan to optimize obstetrical and oncological care.