no response

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no response (NR)

the condition in which the maximum decrease in treated tumor volume is less than 50%.
References in classic literature ?
Groping along the wall until I found the communicating door I knocked loudly several times, but got no response, which I attributed to the uproar outside, for the wind was blowing a gale and dashing the rain against the thin walls in sheets.
He called wearily for help, but there was no response.
I received no response, though I finally pounded with all my strength; then I turned the knob and entered, only to find that she was not there.