Alpha, your control arm has 21 alive as of 105 months (about 9 years).
Next, you list the mean OS as 34 months for control and 22 for treatment. That would be a huge win for the control arm if true (thanks to the control arm huge tail).
That should be enough to make clear that this is way off.
More fundamentally, your really do not describe how you got the two curves past some had waving.