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Repros® Therapeutics Submits Data To The FDA Supporting Morning Assessment Of Testosterone For Men Treated With Androxal® As Indicative Of Average And Maximum Levels Attained

Repros Therapeutics Inc. ® (NasdaqCM:RPRX) today announced it has submitted to the FDA data collected from three different studies which the Company believes demonstrates that the assessment of testosterone levels between 8 and 10 in the morning is indicative of the maximum and average levels of the male hormone achieved during a particular day following the administration of Androxal ® . In the Type B meeting held on November 8, 2010, and reported in the Company‚Äôs press release of November 9, 2010, the FDA stated the preferred method to determine testosterone levels in treatments designed to replace the hormone is a 24 hour assessment.

Repros used the services of an outside statistician, Dr. Richard Trout, Professor Emeritus, Rutgers University, in arriving at the conclusions it has reached.

The Company has conducted three trials in which serial testosterone measurements were made over a 24 hour period. Two of the studies assessed 14 (ZA-002) and 11 (ZA-003 subset) time points over the 24 hour period in a total of 28 subjects. A third study (ZN-018) obtained measurements at six points in a total of 20 subjects.

Using the data from the 002 and 003 studies the sponsor has determined that a single total testosterone assessment made between 8 and 10 in the morning correlates to the average of the values of the testosterone measurements for a given subject on a given day (correlation coefficient roughly 0.9 for the times 8, 9 and 10, p value < 0.001).

Performing the same assessment for the maximum value of total testosterone recorded in a 24 hour period, the same single total testosterone assessment made between 8 and 10 in the morning correlates to the maximum value of testosterone for a given subject on a given day (correlation coefficient roughly 0.9 for the times 8, 9 and 10, p value < 0.001).

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