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Relative cell number in primary culture of ovarian carcinoma. Fold decrease from simultaneous control in the number of cells recovered at the end of primary culture of endometrioid ovarian carcinoma treated with 10− 8 M progesterone. A) Values of samples separated by the presence of progesterone receptor, PR (−) n = 5, PR (+) n = 9, P = 0.002. B) Spearman’s correlation between relative cell number in PR (+) samples and the immunoreactive score (IRS) of each sample. R = − 0.62, P = 0.07
