I had the same procedure in May 2023 for a stage 3 adenocarcinoma diagnosis. My A1c was borderline prior to surgery (5.6). I underwent 12 rounds of Fulfirinox over 6 months. During the six months of chemo my glucose and A1c levels increased slightly. By the time I completed treatment my A1c rose to 5.8. Trying to find food that was tolerable during treatment was never easy. I tended to find sweets most satisfying which probably led to the higher levels. I always found comfort eating Worthers caramels!. Since completing treatment I have tried to be more careful with my diet cutting back on sweets. My most recent A1c level was 5.5. Routine exercise is also important. I am 72 years old and my doc also indicated that the 5.8 level was not unusual for my age but I was determined to try and bring it down. More importantly, hopefully your husbands cancer is under control.