Lung adenocarcinoma stage IA and stage IB are distinguished mainly by the size of the tumor, clinical manifestations, and whether postoperative adjuvant treatment is needed.
Although both lung adenocarcinoma stage IA and stage IB belong to early stage lung cancer, there are differences in tumor size and postoperative adjuvant treatment.
1. Tumor size: the main difference between lung adenocarcinoma stage IA and stage IB is that the size of tumor is not the same, the tumor in stage IA is smaller, with maximal diameter ≤3cm, and the maximal diameter of tumor in stage IB is >3cm and ≤4cm, for the maximal diameter of tumor <3cm.
2. Clinical manifestations: lung adenocarcinoma stage IA is mainly confined to the lungs and the visceral pleura, without involving the main bronchus; lung adenocarcinoma stage IB can involve the visceral pleura and the main bronchus, but it does not encroach on the rhabdoid process and is accompanied by pneumonitis and pulmonary atelectasis in all or part of the lungs.
3. Whether postoperative adjuvant therapy is needed: postoperative adjuvant therapy is not recommended for stage IA lung adenocarcinoma, while stage IB lung adenocarcinoma is recommended to "consider" chemotherapy for stage IB patients with high-risk factors, which include: below 45 years of age, poorly differentiated, postoperative pathology suggests that there is cancer embolism in the vasculature, and pathology suggests that the pleura of the dirty layer is involved, The number of lymph nodes detected is too low, and the pathologic subtype is micropapillary.
If lung adenocarcinoma is diagnosed, early and standardized treatment is recommended to reduce the adverse effects of the disease.