Literature DB >> 36118132

Clinicopathologic Characteristics and Outcomes for Patients With KRAS G12D-Mutant NSCLC.

Alissa J Cooper1, Alona Muzikansky2, Jochen Lennerz3, Farhaana Narinesingh3, Mari Mino-Kenudson3, Yin P Hung3, Zofia Piotrowska1, Ibiayi Dagogo-Jack1, Lecia V Sequist1, Justin F Gainor1, Jessica J Lin1, Rebecca S Heist1.   

Abstract

Introduction: Co-occurring mutations in KRAS-mutant NSCLC are associated with discrete biological properties and modulate therapeutic susceptibilities. As G12D-specific inhibitors are expected to enter the clinic, we sought to investigate the characteristics and outcomes of patients with KRAS G12D-mutant NSCLC.
Methods: This was a retrospective single-institution study. Patients with NSCLC and KRAS G12D mutations detected by the Massachusetts General Hospital SNaPshot next-generation sequencing assay were identified. Clinical and pathologic characteristics were collected by chart review.
Results: A total of 107 patients with KRAS G12D-mutant NSCLC were identified. Most patients were former smokers (80, 74.8%) and had tumors with adenocarcinoma pathologic subtype (93, 86.9%). Among 56 patients evaluated for programmed death-ligand 1 expression, tumor proportion score was less than 50% in 43 (76.8%). Concomitant mutations were identified in STK11 (17 of 107, 15.9%), KEAP1 (10 of 58, 17.2%), TP53 (36 of 107, 33.6%), and SMARCA4 (11 of 107, 10.3%). Among 57 patients treated with first-line therapy, patients with STK11 co-mutations had shorter progression-free survival (1.2 mo, 95% confidence interval [CI]: 0.6-2.9 versus 4.1 mo, 95% CI: 2.5-6.0, p = 0.0235) and overall survival (4.3 mo, 95% CI: 1.2-10.6 versus 17.9 mo, 95% CI: 8.6-31.1, p = 0.0018) compared with wild type. Patients with KEAP1 co-mutations had shorter overall survival (4.6 mo, 95% CI: 1.2-10.6 versus 17.9 mo, 95% CI: 7.1-30.1, p = 0.0125) than those without. TP53 co-mutations exerted no influence on survival. Conclusions: Co-occurring mutations were common in patients with KRAS G12D-mutant NSCLC. STK11 and KEAP1 co-mutations were associated with worse clinical outcomes, whereas co-occurring TP53 did not affect survival.
© 2022 The Authors.

Entities:  

Keywords:  Co-mutations; KRAS mutation; Non–small cell lung cancer; Targeted therapies

Year:  2022        PMID: 36118132      PMCID: PMC9471201          DOI: 10.1016/j.jtocrr.2022.100390

Source DB:  PubMed          Journal:  JTO Clin Res Rep        ISSN: 2666-3643


Introduction

The ability to identify and therapeutically target oncogenic driver alterations is a cornerstone of the current treatment paradigm for NSCLC., Mutations in the KRAS gene are among the most often identified oncogenic drivers in patients with NSCLC, with G12C, G12V, and G12D representing the most frequently occurring mutations. RAS-mediated pathways regulate signaling cascades involved in cell proliferation and survival. KRAS missense mutations drive constitutive activation of the RAS protein and promote cancer cell growth and survival. KRAS G12D inhibitors are currently have promising efficacy in preclinical studies and are expected to soon enter clinical trials. This article aims to describe the clinicopathologic characteristics of KRAS G12D lung cancer and outcomes within this population by co-mutation status. Though recent work has compared outcomes for patients across KRAS mutation subtypes,7, 8, 9, 10, 11 or in comparison with KRAS wild-type NSCLC, relatively little is known about the specific characteristics and outcomes for patients with KRAS G12D-mutant NSCLC. This is a considerable gap in the literature, and an understanding of how patients with G12D lung cancer fared before the advent of G12D-specific inhibitors will be needed. Previous literature has revealed an association with never or minimal smoking status,13, 14, 15, 16 including the potential for a poor prognosis compared with other KRAS mutation subtypes., The co-mutational profile, which has emerged as a considerable modulator of prognostic and predictive effect in KRAS-mutated NSCLC, is of particular interest, as co-occurring alterations such as STK11/LKB1, KEAP1, TP53, and SMARCA4 have been associated with discrete biological properties and therapeutic susceptibilities in KRAS-mutant lung cancer.18, 19, 20 In anticipation of cohorts of patients with KRAS G12D-mutant NSCLC soon to be treated with targeted inhibitors, we aimed to investigate the clinical characteristics and outcomes of these patients with particular attention to associated co-mutational profile.

Materials and Methods

Patients

We conducted a retrospective study to evaluate the clinicopathologic characteristics and clinical outcomes of patients with NSCLC harboring KRAS G12D. Patients with NSCLC at the Massachusetts General Hospital (MGH) undergo tumor genotyping using the SNaPshot next-generation sequencing assay. This test uses anchored multiplex polymerase chain reaction technology on DNA and RNA for calling of single-nucleotide variants, insertions, deletions, copy number changes, and fusion transcripts. We identified patients whose SNaPshot testing results revealed KRAS G12D mutation by systematically querying the molecular database. We excluded one patient with a concomitant sensitizing EGFR mutation. We conducted chart review to evaluate clinical, demographic, and pathologic characteristics including co-mutation status. Programmed death-ligand 1 (PD-L1) immunohistochemistry was performed using the clone E1L3N (Cell Signaling Technology) in all cases except one, in which testing was done at an outside institution and antibody clone could not be verified. PD-L1 expression was assessed by means of tumor proportion score. Treatment history was obtained by review of clinical notes. Co-occurring molecular alterations were classified within pathways by searching for each alteration’s pathway in cBioPortal for Cancer Genomics. The study was performed in accordance with an MGH institutional review board-approved protocol.

Treatment Outcomes

Progression-free survival (PFS) was calculated for patients with metastatic disease from time of treatment initiation to date of progression, death, or last known date without progression, with progression defined by the treating physician’s assessment. Overall survival (OS) was calculated for patients with metastatic disease from time of treatment initiation for metastatic disease to date of death or last known date alive. Time-to-event analysis (PFS and OS) was performed with the Kaplan-Meier method. The log-rank test was used for the comparison between survival curves. SAS 4.0 was used for all statistical analyses. We stratified survival analyses by the status of co-mutations in STK11, KEAP1, TP53, and SMARCA4 given previous data revealing differential outcomes in patients with these co-mutational profiles.18, 19, 20

Results

Clinical, Pathologic, and Molecular Characteristics

Among all patients at MGH who underwent SNaPshot testing between May 2014 and August 2021, 665 had cancers with KRAS G12D mutations, including 107 patients with NSCLC (16.1%) (Supplementary Fig. 1). Clinical, demographic, histologic, and molecular characteristics of patients with NSCLC are summarized in Table 1. Median age was 68 (range: 29–90) years, and 59.8% were of female sex. Most patients were former smokers (80, 74.8%) with median pack-years of 25. Many patients presented with stage IV disease at initial diagnosis (51, 47.7%), and another 24 patients eventually developed metastatic disease for a total of 75 (70.1%). Furthermore, 27 of 75 patients had central nervous system metastases at any time. Histology for most patients was adenocarcinoma (93, 86.9%). Analysis of co-mutation status revealed that 17 patients (15.9%) had co-occurring STK11 mutations and 36 patients (33.6%) had TP53 mutations. Among 58 patients with KEAP1 testing, 10 (17.2%) were positive. Co-occurrence of these mutations was uncommon (Table 1). Other notable mutations are displayed in Figure 1 and are listed in detail in Supplementary Table 1. In brief, 20 patients had co-occurring mutations in the RTK/RAS/MAPK pathway (18.7%), 12 in the PI3K/AKT/mTOR pathway (11.2%), 17 in cell-cycle–related genes (15.9%), 11 in the WNT pathway (10.3%), 11 in SMARCA4 (10.3%), two in SMARCB1 (1.9%), and four in ARID1A (3.7%). Of the 51 patients whose NSCLC samples had mutations in STK11, KEAP1, and TP53, 35 had at least one other mutation. PD-L1 level was assessed in 56 patients; PD-L1 level was less than 1% in 24 patients (22.4%), 1% to 49% in 19 patients (17.8%), and greater than or equal to 50% in 13 patients (12.2%). Figure 2 illustrates a scattergram of PD-L1 expression by co-mutation. PD-L1 expression was similar among wild-type and mutant for TP53 and SMARCA4 mutations, but relatively lower in STK11- and KEAP1-mutant samples compared with wild type. Variant allele frequencies for KRAS G12D for each patient’s tumor samples are enumerated in Supplementary Table 2.
Table 1

Characteristics of Patients With KRAS G12D-Mutant NSCLC

CharacteristicsOverall (N = 107)
Age at diagnosis, median (range)68 (29–90)
Sex
 Male43 (40.2)
 Female64 (59.8)
Race
 White93 (86.9)
 Black3 (2.8)
 Asian3 (2.8)
 Hispanic4 (3.7)
 Unavailable4 (3.7)
Smoking status
 Never17 (15.9)
 Former80 (74.8)
 Current10 (9.4)
Pack-years, median (range)25 (0–150)
Initial stage
 Stage I27 (25.2)
 Stage II8 (7.5)
 Stage III21 (19.6)
 Stage IV51 (47.7)
Ever metastatic75 (70.1)
 CNS mets27 (36.0)
 At initial diagnosis14 (18.7)
 Extrathoracic mets51 (68.0)
 At initial diagnosis37 (49.3)
Histology
 Adenocarcinoma93 (86.9)
 Squamous cell2 (1.9)
 Adenosquamous1 (0.9)
 Other11 (10.3)
PD-L1
 <1%24 (22.4)
 1%–49%19 (17.8)
 >50%13 (12.2)
 Not evaluated51 (47.7)
Co-mutation present
 STK1117 (15.9)
 KEAP1a10 (9.4)
 TP5336 (33.6)
 STK11/KEAP17 (6.5)
 STK11/TP533 (2.8)
 KEAP1/TP532 (1.9)
 STK11/KEAP1/TP531 (0.9)
Metastatic (n = 57)
First-line systemic treatment received
 Chemotherapy alone29 (50.9)
 Platinum + pemetrexed19 (33.3)
 Platinum + taxane2 (3.5)
 Pemetrexed alone3 (5.3)
 Included VEGF inhibitor5 (8.8)
 Immunotherapy alone17 (29.8)
 Pembrolizumab13 (22.8)
 Atezolizumab1 (1.8)
 Nivolumab1 (1.8)
 Ipilimumab + nivolumab2 (3.5)
 Chemotherapy + immunotherapy11 (19.3)
Treatment lines
 One24 (42.1)
 Two22 (38.6)
 Three4 (7.0)
 Four or more7 (12.3)

CNS, central nervous system; mets, metastases; PD-L1, programmed death-ligand 1; VEGF, vascular endothelial growth factor.

KEAP1 not evaluated in 49 patients (45.8%) with an earlier version of SNaPshot performed. Among 58 patients with KEAP1 testing, 10 (17.2%) were positive.

Figure 1

Summary of PD-L1 level and molecular alterations in patients with KRAS G12D-mutated NSCLC. This heatmap summarizes the findings of PD-L1 level (top) and molecular alterations (bottom) for each patient in the cohort, with never smokers (blue), former smokers (green), and current smokers (peach) delineated. Squares populated with gray in the PD-L1 and KEAP1 fields indicate that these tests, respectively, were not available for inclusion. PD-L1, programmed death-ligand 1.

Figure 2

Association of PD-L1 level with molecular alterations. Scatterplot of percent expression of PD-L1 (y axis) is illustrated in relationship to molecular wild-type (blue circles) or mutant (red triangles) status. PD-L1 expression was similar among wild-type and mutant for TP53 and SMARCA4 mutations, but relatively lower in STK11- and KEAP1-mutant samples compared with wild type. PD-L1, programmed death-ligand 1.

Characteristics of Patients With KRAS G12D-Mutant NSCLC CNS, central nervous system; mets, metastases; PD-L1, programmed death-ligand 1; VEGF, vascular endothelial growth factor. KEAP1 not evaluated in 49 patients (45.8%) with an earlier version of SNaPshot performed. Among 58 patients with KEAP1 testing, 10 (17.2%) were positive. Summary of PD-L1 level and molecular alterations in patients with KRAS G12D-mutated NSCLC. This heatmap summarizes the findings of PD-L1 level (top) and molecular alterations (bottom) for each patient in the cohort, with never smokers (blue), former smokers (green), and current smokers (peach) delineated. Squares populated with gray in the PD-L1 and KEAP1 fields indicate that these tests, respectively, were not available for inclusion. PD-L1, programmed death-ligand 1. Association of PD-L1 level with molecular alterations. Scatterplot of percent expression of PD-L1 (y axis) is illustrated in relationship to molecular wild-type (blue circles) or mutant (red triangles) status. PD-L1 expression was similar among wild-type and mutant for TP53 and SMARCA4 mutations, but relatively lower in STK11- and KEAP1-mutant samples compared with wild type. PD-L1, programmed death-ligand 1.

Treatment Characteristics of Patients With Metastases

Of the 75 patients who had metastatic disease, 57 were treated with frontline systemic therapy; this consisted chemotherapy (chemo) alone in 29 patients (50.9%), immunotherapy (IO) alone in 17 (29.8%), and combination chemo and IO (chemo/IO) in 11 (19.3%). Most patients received one (24, 42.1%) or two (22, 38.6%) lines of therapy (range: 1–7) (Table 1; Supplementary Figure 2). Treatment type by co-mutation status is displayed in Table 2. In our cohort, approximately half of the patients with each co-mutation were treated with chemo alone, with the remaining patients receiving an IO-containing regimen (IO alone or chemo-IO).
Table 2

First-Line Systemic Therapy Among Patients With Metastatic KRAS G12D-Mutant NSCLC by Presence or Absence of Co-Mutation

Co-MutationChemotherapy Alone, n (%)Immunotherapy Alone, n (%)Chemoimmunotherapy, n (%)Total n
STK11-mut4 (40.0)2 (20.0)4 (40.0)10
STK11-WT25 (53.2)15 (26.3)7 (14.9)47
KEAP1-mut3 (42.9)1 (14.3)3 (42.9)7
KEAP1-WT13 (40.1)11 (34.4)8 (13.3)32
KEAP1-unk13 (72.2)5 (27.8)0 (0)18
TP53-mut12 (57.1)9 (42.9)0 (0)21
TP53-WT17 (47.2)8 (22.2)11 (30.1)36
SMARCA4-mut4 (50.0)3 (37.5)1 (12.5)8
SMARCA4-WT25 (51.0)14 (28.6)10 (20.4)49

mut, mutated; unk, unknown; WT, wild type.

First-Line Systemic Therapy Among Patients With Metastatic KRAS G12D-Mutant NSCLC by Presence or Absence of Co-Mutation mut, mutated; unk, unknown; WT, wild type. First-line treatment was terminated for progression in 38 cases (66.7%) and for toxicity in eight cases (14%). Other reasons for termination were identified in five cases (8.8%), including two (3.5%) in which treatment was stopped owing to stable disease after two years of therapy. Information regarding reason for treatment termination was missing in three cases (5.3%), and treatment was ongoing at the time of this analysis for three patients (5.3%).

Progression-Free Survival

Median PFS among patients with metastatic disease treated with first-line therapy was 3.0 months (95% confidence interval [CI]: 2.1–5.1) with a median follow-up time of 2.84 months (Fig. 3A). Analysis by co-occurring mutational status suggested that STK11 and SMARCA4 mutations were associated with shorter PFS, whereas TP53 mutations had no effect. Median PFS for patients with co-occurring STK11 mutations (n = 10) was 1.2 months (95% CI: 0.6–2.9) compared with 4.1 months (95% CI: 2.5–6.0) for STK11 wild type (n = 47) (p = 0.0235) (Fig. 3B). Patients with SMARCA4 mutations (n = 8) also had shorter PFS than patients who had SMARCA4-wild type disease (n = 49) (median PFS 1.5 mo [95% CI: 0.6–2.1] versus 4.0 mo [95% CI: 2.5–6.0], p = 0.0039) (Fig. 3C). Median PFS for patients with co-occurring KEAP1 mutations (n = 7) was 2.1 months (95% CI: 0.6–no upper bound), compared with 2.8 months for KEAP1 wild type (n = 32) (95% CI: 1.5–6.0, p = 0.1087, Fig. 3D). Median PFS for patients with co-occurring TP53 mutations (n = 21) was not statistically different from TP53 wild type (n = 36) (median PFS 4.7 mo [95% CI: 1.5–6.9] versus 2.8 mo [95% CI: 1.5–5.1], p = 0.7253) (Fig. 3E).
Figure 3

Median PFS among patients with metastatic disease treated with first-line therapy. PFS of the overall population is illustrated (A) and stratified by STK11 mutation (B), SMARCA4 mutation (C), KEAP1 mutation (D), and TP53 mutation (E). Plus signs represent data censored at the last time the patient was known to be without progression. CI, confidence interval; PFS, progression-free survival.

Median PFS among patients with metastatic disease treated with first-line therapy. PFS of the overall population is illustrated (A) and stratified by STK11 mutation (B), SMARCA4 mutation (C), KEAP1 mutation (D), and TP53 mutation (E). Plus signs represent data censored at the last time the patient was known to be without progression. CI, confidence interval; PFS, progression-free survival.

Overall Survival

Median OS in all 75 patients with metastatic disease was 11.9 (95% CI: 8.0–23.3) months with a median follow-up time of 10.64 months. Among the 57 patients treated with first-line systemic therapy, median OS was 10.6 (95% CI: 8.1–27.4) months (Fig. 4A). As observed in the PFS analyses, the presence of co-occurring STK11 mutation was associated with worse outcomes, with median OS for patients with co-occurring STK11 mutations of 4.3 months (n = 10) (95% CI: 1.2–10.6) compared with 17.9 months (95% CI: 8.6–31.1) in STK11 wild type (n = 47, p = 0.0018, Fig. 4B). For patients with KEAP1 mutations (n = 7), median OS was 4.6 months (95% CI: 1.2–10.6) compared with 17.9 months (95% CI: 7.1–30.1) in KEAP1 wild type (n = 32, p = 0.0125, Fig. 4D). Although OS was numerically longer for wild-type patients, presence of SMARCA4 or TP53 mutations did not have a statistically significant effect on OS. Median OS was 6.1 (95% CI: 1.2–27.4) months for patients with co-occurring SMARCA4 mutations (n = 8) versus 17.3 (95% CI: 8.6–29.1) months for patients with SMARCA4 wild type (n = 49, p = 0.4202, Fig. 4C), and for patients with TP53 mutations (n = 21), median OS was 10.6 (95% CI: 7.2–32.3) months compared with 17.3 (95% CI: 5.9–29.1) months for TP53 wild type (n = 36, p = 0.4175, Fig. 4E).
Figure 4

Median OS among patients with metastatic disease treated with first-line therapy. OS of the overall population is illustrated (A) and stratified by STK11 mutation (B), SMARCA4 mutation (C), KEAP1 mutation (D), and TP53 mutation (E). Plus signs represent data censored at the last time the patient was known to be alive. CI, confidence interval; OS, overall survival.

Median OS among patients with metastatic disease treated with first-line therapy. OS of the overall population is illustrated (A) and stratified by STK11 mutation (B), SMARCA4 mutation (C), KEAP1 mutation (D), and TP53 mutation (E). Plus signs represent data censored at the last time the patient was known to be alive. CI, confidence interval; OS, overall survival.

Discussion

Here, we present detailed clinical, pathologic, and molecular characteristics and survival outcomes of patients with KRAS G12D-mutant NSCLC. In general, the clinical characteristics of our patient population were concordant with what has been previously described, with one notable exception: in contrast to previous reports which identified KRAS G12D as more prevalent in never or minimal smokers,,,13, 14, 15, 16 our cohort had only 15.9% never smokers. The G12D amino acid change has not been associated with mutational signature traditionally associated with tobacco smoke, so the predominance of ever smokers in our cohort is somewhat surprising, but it may indicate that the manifold contributions to tumorigenesis do not hinge simply on the presence or absence of tobacco smoke as a carcinogen exposure. Nevertheless, the prevalence of co-occurring STK11, KEAP1, and TP53 mutations in our data set is similar to what has been reported elsewhere,,, suggesting our patient population, although small, is likely representative. In addition, the relatively low level of PD-L1 expression found in the KRAS G12D/STK11-mutated cohort recapitulates what has been revealed with other cohorts.,, Analysis with attention to co-mutational profile lends greater insight into patient outcomes in KRAS G12D NSCLC. We found that patients with KRAS G12D-mutant NSCLC with co-occurring STK11 mutation had worse PFS and OS on first-line systemic treatment than STK11 wild type, whereas TP53 mutations exerted no influence. Patients with co-occurring KEAP1 mutations had worse OS; a statistically significant difference in PFS was not found, although the numbers are small. Patients with SMARCA4 mutations had poorer PFS, though this difference was not borne out in OS analyses. These results must be contextualized within what is currently known about co-mutations in both KRAS-mutant and KRAS wild-type NSCLC. Co-occurring alterations are key contributors to the tumor heterogeneity that is found in KRAS-mutated lung cancer, with alterations in STK11, TP53, and KEAP1 defining distinct subtypes. A number of studies have revealed shorter survival times for patients with STK11 mutations; some have indicated that the presence of this alteration may be prognostic without consideration of treatment history,,, and others have revealed poorer response to treatment.,, Similarly, KEAP1 mutations have been found to confer poorer outcomes both independent of and related to treatment history,,, and in NSCLC without concurrent KRAS mutations. As IO has emerged as the backbone of frontline treatment in NSCLC, special interest has developed in determining the impact of the co-mutational profile on treatment outcomes with immune checkpoint inhibitors. Inactivation of STK11 in particular has been associated with a “cold” or barren immunologic tumor microenvironment, with paucity of tumor-infiltrating lymphocytes in both murine models and human tumor samples. This has led to the hypothesis that these co-mutations may render IO treatment less effective, and indeed, several groups have revealed that co-mutations in STK11,,, and KEAP1 are associated with resistance to programmed cell death protein 1 blockade, worse PFS, and worse OS in KRAS-mutant lung cancer. Interestingly, when Ricciuti et al. evaluated the effect of co-mutations among patients treated with first-line platinum chemo, they found that STK11 and KEAP1 mutations were associated with shorter PFS among KRAS-mutant lung cancer, but not wild type, in that setting as well. Our data are generally concordant with these results, though small sample size of the patients with KEAP1-mutant disease limited our ability to detect a statistically significant difference in PFS for this population. In our data set, we did not have sufficient power to separate the first-line treatment by IO alone or chemo with IO. The findings of Ricciuti et al. though, where STK11 and KEAP1 mutations were also noted to be associated with worse outcomes in the platinum-treated setting, suggest that the effect of these co-mutations might not be confined to the IO setting alone. Mutations in STK11, a tumor suppressor gene also known as LKB1, enable alterations in cell growth and polarity that facilitate tumorigenesis and promote metastasis, and decrease tolerance to oxidative stress. The KEAP1-NFE2L2 pathway regulates metabolic homeostasis and oxidative damage response; mutations in this pathway have been found to confer tumor survival advantage and promote an aggressive tumor subtype. Preclinical studies have revealed important differences in downstream signaling and inflammatory microenvironment on the basis of STK11 and TP53 status, including on metabolic programming on the basis of STK11 and KEAP1 mutations., KEAP1 mutations have been found to confer chemoresistance to NSCLC cells in both in vitro and murine model experiments, which may translate to a shorter duration of chemo in patients with KEAP1-mutated tumors. Therefore, these alterations may affect clinical outcomes regardless of specific treatment type. In contrast to the poorer outcomes found with traditional chemo or IO modalities, there has been a suggestion that targeted therapies may be especially beneficial for some co-mutant profiles. A preliminary exploratory analysis of patients with KRAS G12C treated with adagrasib in the KRYSTAL-1 study revealed that the objective response rate was higher in patients with co-mutations in STK11, though there were no differences in patients who harbored KEAP1 or TP53 co-mutations. This effect was not replicated in the evaluation of response by co-mutation in studies of sotorasib, and indeed it seemed that there was a numerically lower response rate in patients with KEAP1-mutant cancer compared with wild type (20% versus 44%). Although it is unknown whether such differences would also be found in patients with KRAS G12D treated with G12D-specific therapy, the differential survival outcomes found with standard first-line treatment suggest that these are indeed different populations with potentially different responses to therapy. Interestingly, several groups have found that despite its significance as a co-mutation in other oncogene-driven tumor types, or in non–KRAS-driven cancers,,, TP53 as a concurrent alteration in KRAS NSCLC does not seem to drive outcomes,,,,, a finding recapitulated by the data presented here. When studied in more granular detail, it seems that there may be differential effects between missense and truncating alterations and that concomitant missense TP53 mutations may lead to a paradoxical survival benefit when accompanied by STK11 or KEAP1 mutations., The mechanism underlying this interesting finding is not yet well described, but it may involve complex interactions between mutant p53 and the NRF2 pathway. Other groups have indicated that a combination of co-mutations including TP53 may confer a poorer risk than single co-mutations alone. Because of low numbers of multiply occurring co-mutations, we were not able to investigate further the precise effect of TP53 in combination with STK11 or KEAP1 mutations, but it is clear that this complex interplay requires further study. Last, we explored the outcomes of patients with SMARCA4 co-mutations given their significant prevalence in our sample. These alterations have been less studied in the context of KRAS-mutant NSCLC. On a molecular level, SMARCA4 is involved in transcriptional regulation of gene expression promoting NSCLC development, and independently has been found to portend shorter OS both with and without treatment effect.,,, In KRAS-mutant NSCLC, one group had poorer response to IO, though another exhibited improved survival with IO, perhaps related to higher TMB (though lower PD-L1 was often present). In our cohort, patients with SMARCA4 mutations had poorer PFS than wild type, though OS was not significantly different. Interestingly, Schoenfeld et al. found that the deleterious effects of SMARCA4 mutations persisted even if the mutation was nontruncating. Therefore, despite the fact that most our sample comprised nontruncating mutations, it seems possible that we could have captured the detrimental effect of SMARCA4 mutations even in this small cohort. The limitations of the study are chiefly that as a single-center retrospective study, we did not have sufficient power to stratify our analysis by treatment type. In addition, in analyzing real-world outcomes outside of the context of clinical trials, judgment of disease progression or stability was based on treating physician’s judgment rather than from Response Evaluation Criteria in Solid Tumors data, though we reviewed radiographic reports to ensure concordance with the treating physician’s judgment. Nevertheless, this study is significant in that it reveals the differential outcomes on the basis of co-mutational pattern in patients with KRAS G12D-mutant NSCLC. The implications are clinically relevant and may affect how we counsel patients, how we select individualized treatment plans, and how we design studies. It is imperative that we understand as much as possible regarding the specific genomic landscape of individual tumors in the context of new drug development and in predicting potential response. Within the limitations of this single-center retrospective study, we found that the detrimental outcomes in patients with KRAS G12D-mutant NSCLC may be largely driven by co-mutational pattern, which may in turn indicate aggressiveness of disease and potential resistance to available standard chemotherapies and immunotherapies. Further validation is warranted in larger cohorts as we seek to further clarify the way forward for patients with KRAS G12D-mutated cancers.

CRediT Authorship Contribution Statement

Alissa J. Cooper: Conceptualization, Data curation, Investigation, Writing—original draft, Writing—review and editing. Alona Muzikansky: Formal analysis, Methodology, Writing—review and editing. Jochen Lennerz: Resources, Data curation, Writing—review and editing. Farhaana Narinesingh: Data curation, Writing—review and editing. Mari Mino-Kenudson, Yin P. Hung, Zofia Piotrowska, Ibiayi Dagogo-Jack, Lecia V. Sequist, Jessica J. Lin, Justin F. Gainor: Writing—review and editing. Rebecca S. Heist: Conceptualization, Methodology, Investigation, Supervision, Writing—review and editing.
  46 in total

1.  Impact of KRAS and TP53 Co-Mutations on Outcomes After First-Line Systemic Therapy Among Patients With STK11-Mutated Advanced Non-Small-Cell Lung Cancer.

Authors:  Erin Bange; Melina E Marmarelis; Wei-Ting Hwang; Yu-Xiao Yang; Jeffrey C Thompson; Jason Rosenbaum; Joshua M Bauml; Christine Ciunci; Evan W Alley; Roger B Cohen; Corey J Langer; Erica Carpenter; Charu Aggarwal
Journal:  JCO Precis Oncol       Date:  2019-05-10

2.  Characteristics and Outcomes of Patients With Metastatic KRAS-Mutant Lung Adenocarcinomas: The Lung Cancer Mutation Consortium Experience.

Authors:  Badi El Osta; Madhusmita Behera; Sungjin Kim; Lynne D Berry; Gabriel Sica; Rathi N Pillai; Taofeek K Owonikoko; Mark G Kris; Bruce E Johnson; David J Kwiatkowski; Lynette M Sholl; Dara L Aisner; Paul A Bunn; Fadlo R Khuri; Suresh S Ramalingam
Journal:  J Thorac Oncol       Date:  2019-02-05       Impact factor: 15.609

3.  Prognostic impact of KRAS mutation subtypes in 677 patients with metastatic lung adenocarcinomas.

Authors:  Helena A Yu; Camelia S Sima; Ronglai Shen; Samantha Kass; Justin Gainor; Alice Shaw; Megan Hames; Wade Iams; Jonathan Aston; Christine M Lovly; Leora Horn; Christine Lydon; Geoffrey R Oxnard; Mark G Kris; Marc Ladanyi; Gregory J Riely
Journal:  J Thorac Oncol       Date:  2015-03       Impact factor: 15.609

4.  Identification of MRTX1133, a Noncovalent, Potent, and Selective KRASG12D Inhibitor.

Authors:  Xiaolun Wang; Shelley Allen; James F Blake; Vickie Bowcut; David M Briere; Andrew Calinisan; Joshua R Dahlke; Jay B Fell; John P Fischer; Robin J Gunn; Jill Hallin; Jade Laguer; J David Lawson; James Medwid; Brad Newhouse; Phong Nguyen; Jacob M O'Leary; Peter Olson; Spencer Pajk; Lisa Rahbaek; Mareli Rodriguez; Christopher R Smith; Tony P Tang; Nicole C Thomas; Darin Vanderpool; Guy P Vigers; James G Christensen; Matthew A Marx
Journal:  J Med Chem       Date:  2021-12-10       Impact factor: 7.446

5.  Diminished Efficacy of Programmed Death-(Ligand)1 Inhibition in STK11- and KEAP1-Mutant Lung Adenocarcinoma Is Affected by KRAS Mutation Status.

Authors:  Biagio Ricciuti; Kathryn C Arbour; Jessica J Lin; Amir Vajdi; Natalie Vokes; Lingzhi Hong; Jianjun Zhang; Michael Y Tolstorukov; Yvonne Y Li; Liam F Spurr; Andrew D Cherniack; Gonzalo Recondo; Giuseppe Lamberti; Xinan Wang; Deepti Venkatraman; Joao V Alessi; Victor R Vaz; Hira Rizvi; Jacklynn Egger; Andrew J Plodkowski; Sara Khosrowjerdi; Subba Digumarthy; Hyesun Park; Nuno Vaz; Mizuki Nishino; Lynette M Sholl; David Barbie; Mehmet Altan; John V Heymach; Ferdinandos Skoulidis; Justin F Gainor; Matthew D Hellmann; Mark M Awad
Journal:  J Thorac Oncol       Date:  2021-11-02       Impact factor: 15.609

6.  A retrospective observational study of the natural history of advanced non-small-cell lung cancer in patients with KRAS p.G12C mutated or wild-type disease.

Authors:  Alexander I Spira; Huakang Tu; Shivani Aggarwal; Hil Hsu; Gillis Carrigan; Xuena Wang; Gataree Ngarmchamnanrith; Victoria Chia; Jhanelle E Gray
Journal:  Lung Cancer       Date:  2021-05-25       Impact factor: 5.705

7.  The LKB1-AMPK pathway: metabolism and growth control in tumour suppression.

Authors:  David B Shackelford; Reuben J Shaw
Journal:  Nat Rev Cancer       Date:  2009-08       Impact factor: 60.716

8.  Treatment Outcomes and Clinical Characteristics of Patients with KRAS-G12C-Mutant Non-Small Cell Lung Cancer.

Authors:  Kathryn C Arbour; Hira Rizvi; Andrew J Plodkowski; Matthew D Hellmann; Andrea Knezevic; Glenn Heller; Helena A Yu; Marc Ladanyi; Mark G Kris; Maria E Arcila; Charles M Rudin; Piro Lito; Gregory J Riely
Journal:  Clin Cancer Res       Date:  2021-02-08       Impact factor: 12.531

Review 9.  The Keap1-Nrf2 pathway: Mechanisms of activation and dysregulation in cancer.

Authors:  Emilia Kansanen; Suvi M Kuosmanen; Hanna Leinonen; Anna-Liisa Levonen
Journal:  Redox Biol       Date:  2013-01-18       Impact factor: 11.799

10.  Prognostic value of TP53 concurrent mutations for EGFR- TKIs and ALK-TKIs based targeted therapy in advanced non-small cell lung cancer: a meta-analysis.

Authors:  Kang Qin; Helei Hou; Yu Liang; Xiaochun Zhang
Journal:  BMC Cancer       Date:  2020-04-16       Impact factor: 4.430

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