Effective in improving the general knowledge about breast cancer of health staffs Time Knowledge Before (n=120) After (n=90) p Efficiency index% Good general knowledge 54 (45, 0) 75 (83, 3) <0, 001 +85, 1 Total knowledge score (Mean ± SD) 26, 0 ±5, 42 29, 1 ±3, 02 <0, 001 * +11, 9 * Mann Whitney test Interpret: After the intervention, the percentage of health staffs with satisfactory general knowledge about cancer and the average score of knowledge increased compared to before the intervention (p<0.05).