A biological marker, strongly associated with early oral contraceptive use, for the selection of a high risk group for premenopausal breast cancer
In a population-based group of women, consecutively diagnosed, with premenopausal breast cancer there was a significant correlation between tumour size and plasma prolactin (r=0.30;P<0.004). The concentration of estrogen receptor was negatively correlated to tumour size (r=-0.17;P<0.09). There were no substantial correlations between tumour size and progesterone receptor, plasma progesterone or es
