apy ▁that ▁is ▁most ▁effective ▁for ▁their ▁patient . ▁With ▁personal ised ▁medicine , ▁these ▁treat ments ▁can ▁be ▁more ▁specifically ▁tail ored ▁to ▁an ▁individual ▁and ▁give ▁insight ▁into ▁how ▁their ▁body ▁will ▁respond ▁to ▁the ▁drug ▁and ▁if ▁that ▁drug ▁will ▁work ▁based ▁on ▁their ▁gen ome . ▁The ▁personal ▁gen ot ype ▁can ▁allow ▁phys icians ▁to ▁have ▁more ▁detailed ▁information ▁that ▁will ▁guide ▁them ▁in ▁their ▁decision ▁in ▁treatment ▁pres cri ptions , ▁which ▁will ▁be ▁more ▁cost - effect ive ▁and ▁accurate . ▁As ▁quoted ▁from ▁the ▁article ▁Ph arm ac ogen om ics : ▁The ▁Promise ▁of ▁Personal ised ▁Medicine , ▁“ ther apy ▁with ▁the ▁right ▁drug ▁at ▁the ▁right ▁do se ▁in ▁the ▁right ▁patient ” ▁is ▁a ▁description ▁of ▁how ▁personal ized ▁medicine ▁will ▁affect ▁the ▁future ▁of ▁treatment . ▁For ▁instance , ▁Tam ox ifen ▁used ▁to ▁be ▁a ▁drug ▁commonly ▁pres cribed ▁to ▁women ▁with ▁ER + ▁breast ▁cancer , ▁but ▁ 6 5 % ▁of ▁women ▁initially ▁taking ▁it ▁developed ▁resistance . ▁After ▁some ▁research ▁by ▁people ▁such ▁as ▁David ▁F lock hart , ▁it ▁was ▁discovered ▁that ▁women ▁with ▁certain ▁mut ation ▁in ▁their ▁C Y P 2 D 6 ▁gene , ▁a ▁gene ▁that ▁enc odes ▁the ▁met abol izing ▁en zym e , ▁were ▁not ▁able ▁to ▁efficiently ▁break ▁down ▁Tam ox ifen , ▁making ▁it ▁an ▁in effect ive ▁treatment ▁for ▁their ▁cancer . ▁Since ▁then , ▁women ▁are ▁now ▁gen ot yp ed ▁for ▁those ▁specific