It is wordy. But how to make it shorter?

"Significantly higher" isn't a sentence.

I mean:

The survival rate is 30% in the virus group, 89% and 97% respectively in the two paclitaxel and its analogue groups with difference concentration (180mg/kg、70 mg/kg). The survival rate of the latter is significantly higher than the that of the former.

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The survival rate is 30% in the virus group, 89% and 97% respectively in the two paclitaxel and its analogue groups with difference concentration (180mg/kg、70 mg/kg), significantly higher.

Just saying 'significantly higher" is ambiguous as to what you are referring to. If you want to be more concise, you should consider leaving out the second sentence entirely, because the first sentence makes the survival rate of the latter group abundantly clear, and makes the second sentence superfluous.

Thank you.
But if we are to stress the importance of the difference, how?

The survival rate of the latter is significantly higher than that of the former.
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I would keep it as written. I would prefer wordy to lack of clarity.

Thank you Roger.

It's not wordy, it's fine as it is.

It could be "dumbed down" into something like "Group A do much better than Group B", but that's not an improvement.

Why do you want to make it less wordy in the first place? It isn't, particularly.

Thank you, McTag and Jack.