Gilead Sciences (NASDAQ:GILD) is a long-standing leader in HIV treatment, but its sales of its hepatitis C drug Sovaldi that's driving the company's revenue surge.

While Sovaldi's sales are soaring, investors are right to wonder if the drug's break neck revenue pace can continue. If it can't, then investors will need Gilead to maintain its dominance in HIV treatment.

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In the following slideshow, you'll read three quotes from Gilead's top management that offer insight into the company's hepatitis C and HIV business and learn why those quotes may matter to investors.

Todd Campbell owns shares of Gilead Sciences. Todd owns E.B. Capital Markets, LLC. E.B. Capital's clients may or may not have positions in the companies mentioned. Todd owns Gundalow Advisors, LLC. Gundalow's clients do not have positions in the companies mentioned.The Motley Fool recommends Gilead Sciences. The Motley Fool owns shares of Gilead Sciences. 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.