The doctors concluded that NA-1 was safe, with only two patients having mild side effects.

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Moreover, the company argues that given Iressa's mild side effects, why not give it to all lung cancer patients in search of the one-tenth who will do well on it?

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Modern HIV treatment is powerful, can consist of just one pill once-daily, and often causes only mild side-effects.

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The researchers said side effects were mild in the study, whose duration for participants averaged 1.2 years.

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But side effects can include mild flu-like symptoms, including a runny nose or sore throat.

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Side effects reported were generally mild, and included dry mouth and loss of appetite.

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So far, side effects from Benlysta have been mild, but the drug works by dulling the immune system, so doctors and investors will be watching closely to see if it raises the risk of infection.

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Side effects have been limited to nausea and mild skin reactions to the injection.

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