What stage colon cancer is it if 9 out of 16 lymph nodes involved and is it curable with chemotherapy?

Stage 3c. Distant metastasis has to be ruled-out because otherwise it will become stage 4.
Stage lll. In general, regional lymph node involvement is stage 3. There are subclassifications that occasionally change. Check the american cancer society website for colorectal cancer staging for the latest info. Sorry you or your family/friends have this, and best of luck with the treatment. Remember, statistics can help, but you are not a statistic, hence there is always hope.