While it may seem cliché, the fact is that successful people in any arena have increased challenges than "regular folks".
Although our understanding of the factors that influence the safety and efficacy of these therapies has increased, challenges for bringing genetically modified T-cell immunotherapy to many patients with different tumour types remain.
Hostage-taking has increased, challenging the new Iraqi government and reflecting an intensifying campaign against citizens whose countries provide troops or subcontracting work for the American-led military presence.
These three stages have increasing difficulty, and are extremely challenging in terms of estimation theories, methods, and technologies.
James Levine, the conductor, may have increased the challenges to the singers with the spacious tempos he took in Act I, especially the scene between Brünnhilde and Waltraute, her Valkyrie sister.
"As a result of closer integration within the EU and, more recently with the euro area crisis, this may have increased the challenges to UK economic and financial stability," he said.
The dwindling armamentarium of existing antimicrobial agents, a limited pharmaceutical pipeline of future therapies, and the emergence of antimicrobial-resistant bacteria have increased the challenge of treating cardiothoracic infections.
Penney and other department store chains have faced increasing challenges as shoppers worry about job security, declining home prices and tight credit.
Nosocomial infections and antimicrobial resistance have become increasing challenges in low-income countries.
But legal challenges have increased, and some critics refer to a court decision last year in San Diego as a possible turning point in the use of cameras.
