It marks the finish of Steve's chemotherapy regime with Alimta/pemetrexed and carboplatin, his second chemo treatment since the Velcade/cisplatin drug trial back in 2009 when he was diagnosed with mesothelioma.
In some ways, I feel we should be marking the significance of this day. It's been quite a grueling five months during which time we have more or less gone into hibernation - although the awful weather is probably just as much to blame for that as the chemo!
However, in other ways today doesn't feel significant. The side effects of treatment won't come to an abrupt end simply because we've reached day 21 of cycle 6. Things will get better over time, but it's baby steps forward at present...
We have no idea what effect the treatment has had on Steve's mesothelioma - that will have to wait until the follow up meeting after the scan, when we will have the opportunity to talk through the results with the doctor in March.
So...treatment is officially over, but the side effects linger on and the outcome is unknown. The waiting game continues on both fronts.
With so much still in the pipeline, it feels a bit of an anti-climax in some ways. However, at least we don't have the prospect of another day in hospital looming over us tomorrow. The sun is shining today. And we are both still here to enjoy it together, 44 months almost to the day when Steve heard his diagnosis. That's got to be worth celebrating!