NEW ORLEANS—In a population of women with multiple sclerosis (MS) and a live birth, the rate of disease-modifying drug treatment decreased before and during pregnancy and increased steadily post partum, according to a report presented at the 31st Annual Meeting of the Consortium of MS Centers. In a separate analysis by the same researchers, they reported that less than one-third of women with MS and a live birth initiated a disease-modifying treatment within one year after delivery. “The rate of disease-modifying drug initiation increased with the number of relapses the patient experienced prior to pregnancy,” said Maria K. Houtchens, MD, on behalf of her research collaborators. Dr. Houtchens is an Assistant Professor in the Department of Neurology at Harvard Medical School and Director of the Women’s Health Program at the Partners MS Center at Brigham and Women’s Hospital in Boston.
Maria K. Houtchens, MD
Treatment Before, During, and After Pregnancy
To evaluate treatment patterns before, during, and after pregnancy in women with MS and a live birth, Dr. Houtchens and colleagues used a US administrative claims database to conduct a retrospective analysis of women ages 18 to 65 with MS, a claim indicative of a live birth, and one-year continuous eligibility before and after pregnancy in the IMS Health Real World Data Adjudicated Claims US database from January 1, 2006, to June 30, 2015. Disease-modifying drug treatment was evaluated during the year prior to pregnancy (at three-month intervals), the three trimesters of pregnancy, puerperium (six weeks post pregnancy), and one year post pregnancy (seven to 12 weeks post pregnancy and three to six, six to nine, and nine to 12 months post pregnancy). The researchers evaluated the proportion of women exposed to disease-modifying drug treatment during the 12 time periods. Results were also stratified by the number of relapses women experienced in the year prior to pregnancy.
Of 190,475 women with MS, 2,158 met eligibility criteria. Mean age was 30.26. Most women had commercial health insurance (98%) and were from the Midwest (32%), South (30%), or Northeast (29%) regions of the US.
The proportion of women with MS and a live birth treated with any disease-modifying drug was 20.48% at nine to 12 months pre-pregnancy, 21.46% at six to nine months pre-pregnancy, 20.62% at three to six months pre-pregnancy, and 17.75% at three months pre-pregnancy. During pregnancy, the proportion of women treated with a disease-modifying drug decreased to 12.05% during the first trimester and 1.90% during the second trimester, and then increased slightly to 2.97% during the third trimester. The proportion of women treated with disease-modifying drugs increased to 8.34% during puerperium, 12.93% during seven to 12 weeks post partum, 21.97% during three to six months post partum, 24.47% during six to nine months post partum, and 25.49% during nine to 12 months post partum. The majority of women (81.9%) had received disease-modifying drug treatment by six to nine months post partum. The proportion of women with disease-modifying drug treatment before and after pregnancy increased numerically with the number of relapses experienced before pregnancy.
Treatment After a Live Birth
In a separate analysis using the same cohort, Dr. Houtchens and colleagues looked closer at the time to initiation of disease-modifying drug treatment after a live birth in women with MS. Of the 2,094 women included in this analysis, the proportion with a live birth initiating a disease-modifying drug treatment within one year was 28.46%, and the proportion with no disease-modifying treatment within one year was 71.54%.
For those initiating a disease-modifying treatment within one year, mean time from live birth to first treatment was 118.98 days, and median time to first treatment was 93.50 days. A total of 16.11% received a disease-modifying drug less than 30 days after live birth, approximately half initiated a treatment within 90 days (47.82%), and three-quarters initiated a disease-modifying drug within six months (75.5%). The proportion of patients initiating treatment within one year after live birth increased with higher numbers of pre-pregnancy relapses (zero relapses, n = 441, 24.53%; one relapse, n = 108, 50.94%; two relapses, n = 33, 54.10%; three or more relapses, n = 14, 60.87%). The mean number of days until disease-modifying drug initiation for those receiving treatment within one year who had zero pre-pregnancy relapses was 123.57 (median, 99); one relapse, 107.95 (median, 80); two relapses, 120.76 (median, 98); and three or more relapses, 55.57 (median, 49.5). Patients who received disease-modifying drug treatment one year pre-pregnancy were more likely to receive treatment within one year after delivery, compared with patients without exposure to treatment in the year before pregnancy (72.58% vs 12.44%).
This study was supported by EMD Serono.