Hi Welcome to HCM I Have gone thru your query regarding increase in growth of cancers while having high blood sugar . Dear though there is no such study has been reported But meanwhile, there s no reason not to get blood sugar under control . Doing so may help prevent diabetes and heart disease, besides possibly making cancer less likely . That will be like killing 2 birds w3ith 1 stone . Keeping blood sugar levels within the normal range may reduce cancer risk, write the researchers, who included Par Stattin, MD, PhD, of Sweden s Umea University Hospital. Illness or stress can trigger high blood sugars because hormones produced to combat illness or stress can also cause your blood sugar to rise. Same is the case with cancer . Constant stress ,illness ,worry , anger . lack of nutritious food & lack of exercise do cause cancer , The study doesn t prove that high blood sugar levels cause cancer or that normal blood sugar levels prevent it. And A freindly suggestion is if take care of life style and regular food habits - nutritious food containing all essential nutrients and supplements full of antioxidents -and regular ,walk , exercise ,yoga ,pranayam -deep breething proper rest , sound sleep , meditation and positive atitude towards life . and avoidance of fried , fast foods , tea ,coffee , alcohol , smoking , mental stress worry , anger and constipatin , all factors can help incease strength of your immune system , help resistance from dieseases (may it be diabetes ,heart , or cancer or any big or small) , paving way for happy ,healthy, diseasefree life Hope .this helps yousolve your query Take care .All the best Don t hesitate to get back for further query .