PHILADELPHIA (AP) — Giving patients with advanced melanoma two Bristol-Myers drugs that work differently held the deadly skin cancer at bay far longer than just one, though the combination's considerable increase in serious side effects raises concerns about how much patients can endure. A study of 142 patients not treated previously found combining Yervoy and Opdivo, which mobilize the body's immune system to target cancer cells, greatly boosted survival over giving Yervoy alone.Read more on NewsOK.com