MILAN – The news about multiple sclerosis (MS) and child-bearing in women is largely good, a researcher told colleagues at the 9th Joint ECTRIMS-ACTRIMS Meeting. However, there are still uncertainties about the timing of medical treatment for MS before, during, and after pregnancy.
Epidemiologist Emmanuelle Leray, PhD, of French School of Public Health in Rennes, urged neurologists to not be too eager to take women off medication – or too slow to put them back on it. “MS should not be undertreated due to a desire for pregnancy, as there are several options that are possible and compatible with pregnancy,” she said. As for after pregnancy, when women face a well-known high risk of MS rebound, “we can reasonably assume that women with active MS need to be advised to restart rapid, highly effective DMT [disease-modifying therapy] soon after delivery,” she said.
Women are more likely than men to develop MS, and they often do so during child-bearing years. Pregnancy among women with MS has become more common over the years: A 2018 Neurology study examined U.S. data from 2006 to 2014 and reported that the annual adjusted proportion of women with MS and pregnancy increased from 7.91% to 9.47%.
While it appears that women with MS get pregnant less often than the age-matched general population, that “doesn’t mean that fertility is impaired. It probably rather reflects the impact of an early diagnosis of MS on associated consequences regarding psychological and physical impact,” Dr. Leray said. “Regarding pregnancy outcomes, there is no evidence of an increased risk of prematurity or adverse neonatal outcomes. That’s why we can assume that multiple sclerosis will not impact the course of pregnancy and does not make a pregnancy at-risk.”
But some treatments may be harmful to the fetus, she said. Teriflunomide must be stopped before pregnancy. Natalizumab and fingolimod-siponimod raise the risk of rebound, and alternate drugs should be considered before pregnancy. However, anti–CD 20 drugs and cladribine “may be a relevant option because their use before pregnancy may provide effective disease control without exposing the fetus or the baby.”
Should women be on MS drugs at all during pregnancy, a period when MS typically wanes? “The recommendation is to discontinue disease-modifying therapy before conception,” Dr. Leray said. “However, we know now that some DMTs can be used safely during pregnancy, especially injectables.” Specifically, beta interferon and glatiramer acetate can be used safely during pregnancy, she said.
The biggest hurdle comes after pregnancy, when women face a high risk of MS rebound. The relapse rate has fallen in recent years from about 30% to 11%-14%, Dr. Leray said, possibly because of the rise of more effective treatment. But the risk, she said, is still significant.
What can clinicians do to avert relapse? According to Dr. Leray, research has failed to support several possible alternatives to DMTs – high-dose corticosteroids, intravenous immunoglobulin, and hormonal treatment. “There was no evidence of efficacy of any of these strategies, both in randomized clinical trials and in real-world studies.”
For now, it seems best to restart DMTs as soon as possible after delivery, Dr. Leray said. She urged colleagues to keep in mind that it takes about 3 months for DMTs to reach full efficacy – and research suggests the highest risk of relapse is during the first 3 months after delivery. “That has to be taken into account in the therapeutic strategy,” she said.
Dr. Leray reports consulting/lecture/travel grants from Biogen, Genzyme, MedDay, Merck, Novartis, and Roche.