Because of its insidious onset, the diagnosis of this disease was usually delayed rendening treatment difficult.

此病起病隐匿，诊断时往往已是晚期，治疗困难。

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MDS treatment difficult, some patients can be converted into leukemia, so far there is no ideal method of prevention.

MDS治疗难度高，部分患者可转化为白血病，至今尚无理想的防治方法。

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The changes in my appearance as a result of my cancer treatment can be difficult for other people to understand.

由于癌症的治疗所引发的我外表上的变化，别人可能难以理解。

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STDs carry a stigma that makes surveillance and treatment difficult.

ECONOMIST: Going, going . . . gone?

The goal, Gilead said in its press release, is to create an all-oral treatment for hepatitis C that would replace the difficult treatment with injected interferon and ribavirin, an antiviral pill, along with the fatigue and other side effects they cause.

FORBES: Gilead Tries To Revive Itself With $11 Billion Purchase Of Pharmasset

As a consequence, trans-border correlations, which would have benefited from regional treatment, were difficult to establish.

UNESCO: EARTH SCIENCES FOR SOCIETY