Risks of ovarian, breast, and corpus uteri cancer in women treated with assisted reproductive technology in Great Britain, 1991-2010: data linkage study including 2.2 million person years of observation.

There was a highly significant trend of increasing risk with decreased parity (P<0.001), and a significantly decreased risk with women having a multiple birth (standardised incidence ratio 0.42 (0.14 to 0.99); table 3 ).

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There was a significant trend of decreasing risk with increasing number of live births (P=0.001), and women remaining nulliparous after treatment completion conferred the highest risk (standardised incidence ratio 1.57 (1.37 to 1.79); table 3 ).

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