Among the entire 21-gene assay sample, they found that men were significantly older than women at the time of diagnosis, at a mean age of 64.2 vs. 59.1 years (P less than .001).
Both men and women had infiltrating ductal carcinoma as the most common histology; the prevalence was slightly higher among men at 87.6% versus 81.3% for women.
The average recurrence score in men was 16.8 versus 17.0 in women, a difference that was not statistically significant. A majority of both men and women had RS scores below 18 (65.8% and 58.2%, respectively), although significantly more men than women had RS scores of 31 or higher (12.4% vs. 7.4%; P less than .001).
“This relative predominance of high RS results in men was encountered across age groups but was most prominent in men younger than 40 years of age,” the investigators wrote.