The invention relates to the field of biological
pharmacy and biological
medicine, in particular to application of ICAM1 or a coding
gene thereof in preparation of a product for treating or diagnosing inflammatory
breast cancer. The invention provides application of an ICAM1
antibody-
drug conjugate in preparation of a product. The product at least has one of the following effects: 1) treating inflammatory
breast cancer; 2) inhibiting
lymphatic vessel generation; and 3) the
curative effect of the
immune checkpoint inhibitor on the inflammatory
breast cancer is improved. According to the application, it is determined that ICAM1 can be used as a potential therapeutic target of inflammatory breast
cancer, and two ADCs, namely ICAM1-MMAE and ICAM1-DXd, related to ICAM1 are reasonably designed and developed. Experimental data confirm that ICAM1-DXd can be used as an optimal ADC for
targeted therapy of inflammatory breast
cancer, inhibits the generation of lymphatic vessels, and also shows a synergistic
therapeutic effect after being combined with an
immune checkpoint inhibitor PD1 for treatment. Finally, the application provides important basis and viewpoint for developing ADC drugs for treating inflammatory breast
cancer.