Time frame on cancer - I know drs say... no... it won't move that quickly. That's crap. We are highly metabolic creatures... daily cells die, multiply, and grow. The speed at which all this happens is determined by many things. Biology, DNA, diet, exercise, age, overall health etc...
Why do younger people diagnosed with cancer tend to have more of a fight on their hands and have a more aggressive cancer? Because they generally function at a higher metabolic rate.

Some forms of the same cancer can also be more aggressive.
So despite what they say... yes. things can change in a month.
The older members of this forum have heard this story from me before.

Had my Biopsy - dec 10. - diagnosis - cancer - dec 20 - CT - head, neck and chest dec 21 (no spread - the cancer was localized) I was away after christmas - sitting at a table in a restaurant just before new years (dec 28th) I felt a lump under my chin. It was the size of a small egg. MRI Jan 6. still clear - even though I could feel the lump. Feb 4 surgery day. they removed my tumor (tongue) and 40 lymphnodes - one - was positive for cancer (the lump under my chin) and it had broken through the node into the surrounding tissue.

ANYTHING CAN HAPPEN... and time is always important when you think you are dealing with cancer...

hugs.