Taeyun Kim, Tae Won Jang, Chang Min Choi, Mi-Hyun Kim, Sung Yong Lee, Yoon Soo Chang, Kye Young Lee, Seung Joon Kim, Sei Hoon Yang, Jeong Seon Ryu, Jeong Eun Lee, Shin Yup Lee, Chan Kwon Park, Sang Hoon Lee, Seung Hun Jang, Seong Hoon Yoon, Hyung-Joo Oh
Cancer Res Treat. 2023;55(4):1152-1170. Published online May 19, 2023
Purpose This study aimed to report the final analysis of time-on-treatment (TOT) and overall survival (OS) in patients with advanced-stage epidermal growth factor receptor (EGFR)+ non–small cell lung cancer (NSCLC) who received sequential afatinib and osimertinib and to compare the outcomes with other second-line regimens (comparator group).
Materials and Methods In this updated report, the existing medical records were reviewed and rechecked. TOT and OS were updated and analyzed according to clinical features using the Kaplan-Meier method and log-rank test. TOT and OS were compared with those of the comparator group, in which most patients received pemetrexed-based treatments. A multivariable Cox proportional hazard model was used to evaluate features that could affect survival outcomes.
Results The median observation time was 31.0 months. The follow-up period was extended to 20 months. A total of 401 patients who received first-line afatinib were analyzed (166 with T790M+ and second-line osimertinib, and 235 with unproven T790M and other second-line agents). Median TOTs on afatinib and osimertinib were 15.0 months (95% confidence interval [CI], 14.0 to 16.1) and 11.9 months (95% CI, 8.9 to 14.6), respectively. The median OS in the osimertinib group was 54.3 months (95% CI, 46.7 to 61.9), much longer than that in the comparator group. In patients who received osimertinib, the OS was longest with Del19+ (median, 59.1; 95% CI, 48.7 to 69.5).
Conclusion This is one of the largest real-world studies reporting the encouraging activity of sequential afatinib and osimertinib in Asian patients with EGFR+ NSCLC who acquired the T790M mutation, particularly Del19+.
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Purpose The mammalian target of rapamycin complex 1 (mTORC1) regulates cell growth and proliferation by growth factor coordination and amino acid availability. Leucyl-tRNA synthetase 1 (LARS1) senses the intracellular leucine concentration and mediates amino acid-induced activation of mTORC1. Thus, LARS1 inhibition could be useful in cancer treatment. However, the fact that mTORC1 can be stimulated by various growth factors and amino acids suggests that LARS1 inhibition alone has limitations in inhibiting cell growth and proliferation. We investigated the combined effects of BC-LI-0186, a LARS1 inhibitor, and trametinib, an MEK inhibitor, on non–small cell lung cancer (NSCLC).
Materials and Methods Protein expression and phosphorylation were observed by immunoblotting, and genes differentially expressed between BC-LI-0186–sensitive and –resistant cells were identified by RNA sequencing. The combined effect of the two drugs was inferred from the combination index values and a xenograft model.
Results LARS1 expression was positively correlated with mTORC1 in NSCLC cell lines. BC-LI-0186 treatment of A549 and H460 cells maintained in media supplemented with fetal bovine serum revealed paradoxical phosphorylation of S6 and activation of mitogen- activated protein kinase (MAPK) signaling. Compared with BC-LI-0186–sensitive cells, –resistant cells showed enrichment of the MAPK gene set. The combination of trametinib and BC-LI-0186 inhibited the phosphorylation of S6, MEK, and extracellular signal-regulated kinase and their synergistic effects were confirmed in a mouse xenograft model.
Conclusion The combination of BC-LI-0186 and trametinib inhibited the non-canonical mTORC1-activating function of LARS1. Our study demonstrated a new therapeutic approach for NSCLC without targetable driver mutations.
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Cancer Res Treat. 2023;55(1):112-122. Published online July 19, 2022
Purpose Although osimertinib is the standard-of-care treatment of epidermal growth factor receptor (EGFR) T790M mutation–positive non–small cell lung cancer, real-world evidence on the efficacy of osimertinib is not enough to reflect the complexity of the entire course of treatment. Herein, we report on the use of osimertinib in patients with EGFR T790M mutation–positive non–small cell lung cancer who had previously received EGFR tyrosine kinase inhibitor (TKI) treatment in Korea.
Materials and Methods Patients with confirmed EGFR T790M after disease progression of prior EGFR-TKI were enrolled and administered osimertinib 80 mg daily. The primary effectiveness outcome was progression-free survival, with time-to-treatment discontinuation, treatment and adverse effects leading to treatment discontinuation, and overall survival being the secondary endpoints.
Results A total of 558 individuals were enrolled, and 55.2% had investigator-assessed responses. The median progression-free survival was 14.2 months (95% confidence interval [CI], 13.0 to 16.4), and the median time-to-treatment discontinuation was 15.0 months (95% CI, 14.1 to 15.9). The median overall survival was 36.7 months (95% CI, 30.9 to not reached). The benefit with osimertinib was consistent regardless of the age, sex, smoking history, and primary EGFR mutation subtype. However, hepatic metastases at the time of diagnosis, the presence of plasma EGFR T790M, and the shorter duration of prior EGFR-TKI treatment were poor predictors of osimertinib treatment. Ten patients (1.8%), including three with pneumonitis, had to discontinue osimertinib due to severe adverse effects.
Conclusion Osimertinib demonstrated its clinical effectiveness and survival benefit for EGFR T790M mutation–positive in Korean patients with no new safety signals.
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PURPOSE This study was performed to determine the outcome after treatment of osteosarcoma with intraarterial cisplatin as a preoperative chematherapy regimen. MATERIALS AND METHODS Twenty five patients with extremity osteosarcoma were treated with intraarterial cisplatin at Seoul National University Children's Hospital from January 1987 to April 1996. The dose of cisplatin was 130 mg/m2 and three to six courses were repeated two- to three-week intervals, Systemic doxorubicin was added to six of these patients. This was followed by surgical resection(limb salvage or amputation) and postoperative adjuvant chemotherapy. RESULTS Limb-salvage was possible in twenty of these twenty five patients. Pulmonary metastasis was present in five patients at diagnosis and developed later in three patients.
In six patients treated with systemic doxorubicin, pulmonary metastasis was absent at diagnosis and during follow-up period. Local recurrence after limb salvage was occurred in one patient and treated with amputation and systemic chemotherapy. Seven patients died from pulmonary metastssis and one from unknown cause. The follow-up duration of these patients was three to eighty eight months(median twenty two months) and the overall five-year survival and event free survival rate were 62.1% and 57.5%, respectively. CONCLUSION These data demonstrate that intraarterial cisplatin can be used as an effective regimen preoperatively for pediatric patients with extremity osteosarcoma. The combined use of systemic doxorubicin is expected to improve survival in patients with pulmonary metastasis.
Jae Gahb Park, Nam Sook Kwon, Jin Pok Kim, Seung Keun Oh, Kuhn Uk Lee, Kuk Jin Choe, Soo Tae Kim, Yung Jue Bang, Noe Kyeong Kim, Soon Beom Kang, Myon Woo Shin, Sang Hoon Lee, Joo Hyun Kim, Chong Wook
Serum-free, defined medium ACL-4 has proven to be useful for the establishment and maintenance of human colorectal carcinoma and lung adenocarcinoma cell lines. To determine the general usefulness of ACL-4 as a medium for establishing cell lines, we compared the growth of cells from many different tumor specimens in R10, ACL-4 and AR5 (ACL-4 plus 5% FBS). From June 1987 to July 1988, 69 specimens from a wide variety of human tumors were cultured in R10 and ACL-4 or AR5. Eleven cancer cell lines were established ...... seven cell lines (4 stomach carcinoma, 1 rectal carcinoma, 1 ovarian carcinoma, 1 osteosarcoma) in R10; two cell lines (1 uterine cervical cancer, 1 laryngeal carcinoma) in ACL-4; and two cell lines in AR5 (1 colon carcinoma, 1 rectal carcinoma) (Table I & 2). Of interest, two B lymphoblastoid (non-neoplastic) cell iines were established from a stomach cancer and an acute myeloblastic leukemia specimen grown in ACL-4. We have found that sodium pyruvate, transferrin, and insulin were very important for the growth of uterine cervical cancer cells. Early in this study, we also found that fibroblast growth was effectively suppressed by culturing tumor cells in the serum free medium ACL-4. Therefore, in later attempts, when possible loss of cultures by fibroblast overgrowth was observed, serum containing media were replaced by ACL-4 to suppress and eventually eliniinate the fibroblast contamination. Although we were able tu establish only 11 new cancer cell lines from 69 specimens, our study has extended the use of ACL-4 medium with or without serum for the growth of uterine cervical and laryngeal cancer cells.
Von Hippel-Lindau(VHL) disease is an autosomal dominant disease characterized by development of different tumors in diverse organs, including hemangioblastoma of the central nervous system, renal cell carcinoma, pheochromocytoma, and pancreatic tumors. The gene responsible for this disease, the VHL gene, was recently cloned and germline mutations of this gene identified in patients with VHL. Using polymerase chain reaction(PCR)-single strand conformation polymorphism(SSCP) analysis followed by DNA sequencing, we were able to identify germline mutations of the VHL gene in two unrelated Korean patients exhibiting typical clinical features of the VHL disease. The mutations identified were 2 base pair deletion at codon l79 in one patient, and a missense mutation at codon 190 in the other. Identification of the germline mutation in VHL gene aids in the accurate presymptomatic diagnosis of the at-risk family members of these patients.
three non-metastatic osteosarcoma patients were treated with high-dose methotrexate, adriamycin, and cisplatin from October 1987 to May 1993. Median age was 18. The ratio of male to female was 16: 7. The patients received methotrexate 8g/§³ IV, day 1 and 8 with leucovorin rescue, adriamycin 25mg/§³ IV day 16~18, and cisplatin 75mg/§³ IV day 16, After two cycles of neoadjuvant chemotherapy, operation was done and then six cycles of adjuvant chemotherapy were given with the same regimen. One patient developed lung metastasis after two cycles of neoadjuvant chemotherapy, and the other patient died from sepsis associated with chemotherapy-induced neutropenia before operation. Therefore, 21 patients underwent operation. Among them, l9 patients underwent limb salvage operation. Of the five patients who relapsed, two patients had lung metastasis and another two patients had local recurrence, and one patient had both lung and brain metastasis. One year, three year, and five year disease-free survival rate were 84%, 68%, and 68%. One year, three year, and five year survival rate were 91%, 64%, and 53%, respectively. The site of the primary lesion was the only significant prognosis factor. Patients with the lesion of distal femur had poor prognosis.Histologic responses were assessed in 17 patients. Observed histologic responses were grade I necrosis in 35%, grade II necrosis in 65%. There was no grade III or IV necrosis. The disease-free survival rates and overall survival rates were not significantly different between grade I necrosis group and grade II necrosis group. Toxicities grade III or IV were as follows: leukopenia 32%, thrombocytopenia 9%, hepatotoxicity 14%, and infection 6% with one chemotherapy-related death. The pharmacokinetics of high-dose methotrexate with leucovorin rescue were studied in l0 patients. The highest concentration was achieved at the end of infusion(6 hour). The decay of the plasma concentration of methotrexate after completion of the infusion followed a two-compartment model with a T(1/2)¥a of 3.4¡¾1.9 hours and T(1/2)¥a of 8.0¡¾2.6 hours. The clearance was 55¡¾13ml/min/§³ and the volume of distribution was 8.2¡¾3.0 L/§³. In conclusion, neoadjuvant chemotherapy with high-dose methotrexate, adriamycin, and cisplatin is effective for treatment of the patients of osteosarcoma with preserving the limb function.