Side effects are usually a minor concern when treating terminal diseases like cancer. If you're going to die not taking the drug, hair loss, anemia, seizures, or one of the other numerous side effects of cancer treatments are acceptable risks.
But as more drugs become available to treat a disease, the side effects become increasingly important if the increase in life expectancy is approximately the same.
Last November, Medivation
The improvement in survival was similar to Johnson & Johnson's
That meeting -- the 2012 Genitourinary Cancers Symposium -- is being held this week, which caused the jump today after Medivation and Astellas released additional data on the safety profile as well as some secondary endpoints. The message: All clear on the home front. The biggest concern -- potential for seizures -- doesn't seem to be a major concern, with just 0.6% of patients exhibiting the side effect.
In addition to helping MDV3100 compete with Zytiga for late-stage patients who have failed Sanofi's
Of course, efficacy is still king. The stock more than doubled when the top-line data were announced; it's only up a little more than 20% today.
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Fool contributor Brian Orelli holds no position in any company mentioned. Click here to see his holdings and a short bio. The Motley Fool owns shares of Dendreon and Johnson & Johnson. Motley Fool newsletter services have recommended buying shares of and creating a diagonal call position in Johnson & Johnson. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.