They need more information — like '... since I saw him three years ago'/'... in the last five years'/'... since my last MRI' (though a few more millimetres would be a more plausible growth rate for a tumour).
1) David has grown three more inches since I last saw him. :tick:
2) That tree has grown one more foot in the last five years. :tick:
3) The tumor has grown a few more millimeters since your last MRI. :tick: