Evaluating the role of FAMIly history of cancer and diagnosis of multiple neoplasms in cancer patients receiving PD-1/PD-L1 checkpoint inhibitors: the multicenter FAMI-L1 study.

Background: We investigate the role of family history of cancer (FHC) and diagnosis of metachronous and/or synchronous multiple neoplasms (MN), during anti-PD-1/PD-L1 immunotherapy. Design: This was a multicenter retrospective study of advanced cancer patients treated with anti-PD-1/PD-L1 immunotherapy. FHC was collected in lineal and collateral lines, and patients were categorized as follows: FHC-high (in case of cancer diagnoses in both the lineal and collateral family lines), FHC-low (in case of cancer diagnoses in only one family line), and FHC-negative. Patients were also categorized according to the diagnosis of MN as follows: MN-high (>2 malignancies), MN-low (two malignancies), and MN-negative. Objective response rate (ORR), progression-free survival (PFS), overall survival (OS), and incidence of immune-related adverse events (irAEs) of any grade were evaluated.
Results: 822 consecutive patients were evaluated. 458 patients (55.7%) were FHC-negative, 289 (35.2%) were FHC-low, and 75 (9.1%) FHC-high, respectively. 29 (3.5%) had a diagnosis of synchronous MN and 94 (11.4%) of metachronous MN. 108 (13.2%) and 15 (1.8%) patients were MN-low and MN-high, respectively. The median follow-up was 15.6 months. No significant differences were found regarding ORR among subgroups. FHC-high patients had a significantly longer PFS (hazard ratio [HR] = 0.69 [95% CI: 0.48-0.97], p = .0379) and OS (HR = 0.61 [95% CI: 0.39-0.93], p = .0210), when compared to FHC-negative patients. FHC-high was confirmed as an independent predictor for PFS and OS at multivariate analysis. No significant differences were found according to MN categories. FHC-high patients had a significantly higher incidence of irAEs of any grade, compared to FHC-negative patients (p = .0012). Conclusions: FHC-high patients seem to benefit more than FHC-negative patients from anti-PD-1/PD-L1 checkpoint inhibitors.

Introduction

After the advent of immune checkpoint inhibitors (ICIs), oncology clinical practice radically changed, leading to an unprecedented improvement of cancer patients' clinical outcomes. Nevertheless, we are still a long way from predicting ICI efficacy in each patient. PD-L1 (programmed death ligand-1) protein expression, evaluated in both tumor and immune cells, is the most investigated predictive biomarker[1]; on the other hand, other factors such as tumor mutational burden, body mass index, and gut microbiota, have been investigated as predictors of clinical benefit from immunotherapy across different tumor types.[2-5]

Mismatch repair (MMR) deficiency, which leads to the condition of genetic hypermutability known as microsatellite instability (MSI), is related to the number of somatic mutations (especially in MSI-high cases); many studies have already confirmed its positive predictive role (MSI-high) for ICI treatment, particularly with anti-PD-1 (programmed death-1) antibodies.[6,7] MSI is known to be the hallmark of Lynch syndrome (LS), a familial clustering of colorectal and endometrial cancers. LS is caused by several germline mutations, which result in a defective MMR and is inherited as dominant autosomal character. Similarly, BRCA 1 and 2 (Breast Cancer 1/2) mutations, which are associated with hereditary breast-ovarian cancer syndrome (HBOC), may correlate with the mutational landscape of the tumors, because of the homologous recombination repair deficiency.[8] Moreover, patients with inherited cancer susceptibility syndromes are more likely to develop multiple primary tumors during their life.[9] “BRCA-like” phenotype may be more sensitive to anti-PD-1/PD-L1 agents[10]; thus prospective clinical trials with anti-PD-1 for patients with germline BRCA 1/2 mutations are currently ongoing.[11] LS and HBOC syndrome are just two of the forms of inherited cancer susceptibility. Even though notoriously only about 5% to 10% of all cancers result directly from germline mutations,[12] we can hypothesize that much about family cancer syndromes and cancer predisposition is still unknown. Starting from this hypothesis and from the suggestion that tumors related to inherited cancer susceptibility syndromes seem to have an “immune sensitive phenotype,” we investigated if positive family history of cancer (FHC) and diagnosis of metachronous and/or synchronous multiple neoplasms (MN) could be somehow related to clinical outcomes with anti-PD-1/PD-L1 treatment.

In the preliminary analysis of the “FAMI-L1” study (211 patients), we found that patients with a positive FHC had higher objective response rate (ORR) and disease control rate (DCR), and prolonged time to treatment failure and overall survival (OS), while patients with diagnosis of MN only had a significantly higher DCR.[13] Our first hypothesis has been that the underlying mechanisms to our findings might be DNA damage repair (DDR) gene alterations.[14]

Here, we present the updated results of the FAMI-L1 study, implemented in the study population, in order to confirm our preliminary findings.[13]

Results

Patients’ characteristics

822 consecutive, stage IV cancer patients underwent a treatment with anti-PD-1/PD-L1. 458 patients (55.7%) were FHC-negative, while 364 (44.3%) were FCH-positive: 289 (35.2%) were FHC-low and 75 (9.1) were FHC-high patients, respectively. Among FHC-positive patients, 270 (32.8%) were lineal line positive and 167 (20.3%) were collateral line positive. 123 patients (14.9%) had diagnosis of MN: 29 (3.5%) synchronous MN and 94 (11.4%) metachronous MN. 108 patients (13.2%) were MN-low, while 15 (1.8%) were MN-high. All patient features are summarized in Table 1.

Table 1.

Patient features.

	N° (%)
	822
Age (years)
Median Range Elderly (≥ 70)	6821–92359 (43.7)
Sex
Male Female	552 (67.1)270 (32.9)
ECOG PS
0 – 1 ≥2	689 (83.8)133 (16.2)
Primary tumor
NSCLC Melanoma Renal cell carcinoma Others	475 (57.8)190 (23.1)133 (16.2)24 (2.9)
Number of metastatic sites
≤2 > 2	407 (49.5)415 (50.5)
Type of anti-PD-1/PD-L1 agent
Pembrolizumab Nivolumab Atezolizumab	239 (29.1)559 (68)24 (2.9)
Treatment line of immunotherapy
First Nonfirst	214 (26)608 (74)
FHC
Negative FHC-low FHC-high	458 (55.7)289 (35.2)75 (9.1)
FHC-straight line	270 (32.8)
FHC-collateral line	167 (20.3)
MN
Negative MN-low MN-high	699 (85.1)108 (13.1)15 (1.8)
MN-synchronous	29 (3.5)
MN-methacronous	94 (11.4)

Among FHC-positive and FHC-negative patients, 61 (16.8%) and 62 (13.5%) had a diagnosis of MN (p = .1987).

Efficacy analysis

Among 822 patients, 775 were evaluable for activity; the other 47 had not yet evaluated the disease at the time of the data cutoff analysis or were lost to follow-up/death without evaluation of clinical response. ORR in the overall population was 34.8% (95% CI: 30.8–39.2, 270 responses). As summarized in Table 2, no significant differences were found regarding ORR among subgroups.

Table 2.

Activity data for overall population and subgroups.

ORR analysis
Variable (comparator)	Response ratio	ORR (%) (95% CI)	p-value
Overall	270/775	34.8 (30.8–39.2)	-
FHC Positive Negative	130/347140/428	37.5 (31.3–44.5)32.7 (27.5–38.6)	0.1675
FHC-Straight line Positive Negative	101/256169/519	39.5 (32.1–47.9)32.6 (27.8–37.8)	0.0584
FHC-Collateral line Positive Negative	56/161214/614	34.8 (35.3–56.3)34.9 (26.3–45.2)	0.9866
FHC(FHC-negative) FHC-low FHC-high	101/27529/72	36.7 (29.9–44.6)40.3 (26.9–57.8)	0.3288
Multiple neoplasm Yes No	46/116224/659	39.7 (29.0–52.8)34.0 (29.6–38.7)	0.2380
MN(no MN) MN-low MN-high	41/1045/12	39.4 (28.2–53.4)41.7 (13.5–97.2)	0.4922
MN(no MN) MN-synchronous MN-metachronous	7/2739/89	25.9 (10.4–53.4)43.8 (31.2–59.9)	0.1156

The median follow-up was 15.6 months; in the overall population, median PFS was 9.2 months (95% CI: 8.2–10.6; 479 events) and median OS was 20.5 months (95% CI: 16.2–27.8; 477 censored patients). Tables 3 and 4 report univariate and multivariate analyses of PFS and OS in detail.

Table 3.

Univariate and multivariate analyses for PFS.

	Progression-free survival
	Univariate analysis	Multivariate analysis
Variable (comparator)	HR (95% CI); p-value	HR (95% CI); p-value
FHC Positive vs negative	0.92 (0.76–1.10); p = .3705	-
FHC-Straight line Positive vs negative	0.87 (0.72–1.06); p = .1790	-
FHC-Collateral line Positive vs negative	0.91 (0.73–1.15); p = .4722	-
FHC(FHC-negative) FHC-low FHC-high	0.98 (0.81–1.19); p = .91160.69 (0.48–0.97); p = .0379	0.94 (0.78–1.14); p = .58450.64 (0.45–0.91); p = .0148
Multiple neoplasm Yes vs no	0.78 (0.61–1.02); p = .0771	-
MN(MN-negative) MN-low MN-high	0.79 (0.60–1.04); p = .10600.73 (0.34–1.55); p = .4170	-
MN(MN-negative) MN-synchronous MN-metachronous	0.84 (0.51–1.38); p = .49390.77 (0.58–1.04); p = .0912	-
Primary tumor (NSCLC) Melanoma Kidney Others	0.60 (0.47–0.76); p < .00010.79 (0.62–1.02); p = .07161.34 (0.81–2.22); p = .2516	0.70 (0.54–0.90); p = .00530.65 (0.51–0.84); p = .00121.11 (0.66–1.84); p = .6911
Sex Male vs female	1.15 (0.95–1.40); p = .1309	-
Age Elderly vs nonelderly	1.02 (0.85–1.22); p = .7982	-
Treatment lineNonfirst vs first	1.46 (1.16–1.84); p = .0011	1.33 (1.03–1.71); p = .0261
N° of metastatic sites>2 vs ≤2	1.71 (1.43–2.06); p < .0001	1.62 (1.35–1.95); p < .0001
ECOG PS≥2 vs 0–1	2.14 (1.72–2.67); p < .0001	2.14 (1.72–2.69); p < .0001

Table 4.

Univariate and multivariate analyses for OS.

	Overall survival
	Univariate analysis	Multivariate analysis
Variable (comparator)	HR (95% CI); p-value	HR (95% CI); p-value
FHC Positive vs negative	0.81 (0.65–1.01); p = .0612	-
FHC-Straight line Positive vs negative	0.79 (0.63–1.01); p = .0572	-
FHC-Collateral line Positive vs negative	0.82 (0.62–1.08); p = .8207	-
FHC (FHC-negative) FHC-low FHC-high	0.87 (0.69–1.10); p = .26520.61 (0.39–0.93); p = .0210	0.84 (0.67–1.06); p = .16000.57 (0.37–0.88); p = .0114
MN Yes vs no	0.86 (0.63–1.17); p = .3403	-
MN(MN-negative) MN-low MN-high	0.83 (0.62–1.15); p = .28371.05 (0.49–2.23); p = .8909	-
MN(MN-negative) MN-synchronous MN-metachronous	1.01 (0.57–1.75); p = .97530.82 (0.58–1.16); p = .2624	-
Primary tumor (NSCLC) Melanoma Kidney Others	0.46 (0.35–0.62); p < .00010.56 (0.44–0.82); p = .00141.34 (0.75–2.39); p = .3239	0.54 (0.40–0.74); p = .00010.49 (0.36–0.68); p < .00011.03 (0.57–1.85); p = .9233
Sex Male vs female	1.51 (1.19–1.92); p = .0006	1.30 (1.02–1.65); p = .0317
AgeElderly vs nonelderly	1.15 (0.93–1.42); p = .1972	-
Treatment lineNonfirst vs first	1.41 (1.07–1.84); p = .0129	1.19 (0.88–1.61); p = .2361
N° of metastatic sites>2 vs ≤2	1.66 (1.34–2.06); p < .0001	1.52 (1.22–1.89); p = .0001
ECOG PS≥2 vs 0–1	3.09 (2.43–3.92); p < .0001	3.05 (2.39–3.89); p < .0001

Median PFS in FHC-negative, FHC-low, and FHC-high patients was 9.3 months (95% CI: 7.5–10.6; 277 events), 8.4 months (95% CI: 7–11.4; 166 events), and 20.5 months (95% CI: 8.7–26.4; 36 events), respectively (Figure 1). As reported in Table 3, FHC-high patients had a significantly longer PFS when compared to FHC-negative patients (HR = 0.69 [95% CI: 0.48–0.97], p = .0379); at multivariate analysis, FHC-high was confirmed an independent predictor for PFS (compared to FHC-negative).

Figure 1.

Kaplan–Meier survival curves according to FHC. (a) Progression-free survival. FHC-negative: 9.3 months (95% CI: 7.5–10.6; 277 events); FHC-low: 8.4 months (95% CI: 7–11.4; 166 events); FHC-high: 20.5 months (95% CI: 8.7–26.4; 36 events). (b) Overall survival. FHC-negative: 18.2 months (95% CI: 14.9–23.9; 250 censored patients); FHC-low: 20.8 months (95% CI: 15.4–20.9; 176 censored patients); FHC-high: 31.6 months (95% CI: 26.2–31.6; 51 censored patients).

Median OS in FHC-negative, FHC-low, and FHC-high patients was 18.2 months (95% CI: 14.9–23.9; 250 censored patients), 20.8 months (95% CI: 15.4–20.9; 176 censored patients), and 31.6 months (95% CI: 26.2–31.6; 51 censored patients), respectively (Figure 1). As reported in Table 4, FHC-high patients had a significantly longer OS when compared to FHC-negative patients (HR = 0.61 [95% CI: 0.39–0.93], p = .0210); at multivariate analysis, FHC-high was confirmed an independent predictor for OS (compared to FHC-negative).

Median PFS in MN-negative, MN-low, and MN-high patients was 8.7 months (95% CI: 7.6–10.2; 414 events), 12.3 months (95% CI: 8.3–28.9; 58 events), and 14.4 months (95% CI: 3.6–14.5; 7 events), respectively (Figure 2). As reported in Table 3, no significant differences were found regarding PFS, according to MN categories.

Figure 2.

Kaplan–Meier survival curves according to MN. (a) Progression-free survival. MN-negative: 8.7 months (95% CI: 7.6–10.2; 414 events); MN-low: 12.3 months (95% CI: 8.3–28.9; 58 events); MN-high: 14.4 months (95% CI: 3.6–14.5; 7 events). (b) Overall survival. MN-negative: 20.5 months (95% CI: 15.7–27.1; 43 censored patients); MN-low: 26.2 months (95% CI: 18.7–48.9; 66 censored patients); MN-high: 15.9 months (95% CI: 10.5–15.9; 8 censored patients).

Median OS in MN-negative, MN-low, and MN-high patients was 20.5 months (95% : 15.7–27.1; 43 censored patients), 26.2 months (95% CI: 18.7–48.9; 66 censored patients), and 15.9 months (95% CI: 10.5–15.9; 8 censored patients), respectively (Figure 2). As reported in Table 4, no significant differences were found regarding OS, according to MN categories.

Immune-related adverse events

In the overall population, 329 patients experienced any grade immune-related adverse events (irAEs) (40%). Table 5 summarizes the univariate and multivariate analysis of irAEs of any grade. Overall, FHC-positive patients had a significantly higher incidence of irAEs of any grade (p = .0132) compared to FHC-negative patients; this also occurs when considering lineal line exclusively (p = .0015), but not when considering collateral line exclusively (p = .1491). FHC-high patients had a significantly higher incidence of irAEs of any grade, compared to FHC-negative patients (p = .0012), while FHC-low did not (p = .1240). FHC overall (positive vs negative) and FHC-high (vs negative) were confirmed as independent predictors for higher incidence of irAEs of any grade at the multivariate analysis.

Table 5.

Univariate and multivariate analysis for incidence of irAEs of any grade.

Variable (comparator)	Events ratio	Incidence (95% CI)	p-value
irAEs of any grade – Univariate analysis
Overall	329/822	40.0 (35.8–44.6)
FHC Positive Negative	163/364166/458	44.8 (38.1–52.2)36.2 (30.9–42.2)	0.0132
FHC-Straight line Positive Negative	129/270200/552	47.8 (39.8–56.7)36.2 (31.3–41.6)	0.0015
FHC-Collateral line Positive Negative	75/167254/655	44.9 (35.3–56.3)38.8 (34.1–43.8)	0.1491
FHC (FHC-negative) FHC-low FHC-high	121/28942/75	41.9 (34.7–50.0)56.0 (40.3–75.7)	0.12400.0012
Multiple neoplasm Yes No	49/123280/699	39.8 (46.8–86.0)40.1 (46.8–86.0)	0.9634
MN (MN-negative) MN-low MN-high	43/1086/15	39.8 (28.8–53.6)40 (14.7–87.1)	0.96190.9964
MN (MN-negative) MN-synchronous MN-metachronous	15/2934/94	51.7 (28.9–85.3)36.2 (25.1–50.5)	0.21010.4697
Primary tumor (NSCLC) Melanoma Kidney Others	170/47595/19062/1332/24	35.8 (30.6–41.6)50.0 (40.4–61.1)46.6 (35.7–59.7)8.3 (1.0–30.1)	0.00070.02320.0050
Sex Male Female	196/552133/270	35.5 (30.7–40.8)49.3 (41.2–58.3)	0.0002
Age Elderly Non-elderly	186/463143/359	40.2 (34.6–46.3)39.8 (33.6–46.9)	0.9215
Treatment line First Nonfirst	92/214237/608	43.0 (34.6–52.7)39.0 (34.1–44.2)	0.3034
N° of metastatic sites >2 ≤2	150/415179/407	36.1 (30.6–42.4)43.9 (37.7–50.9)	0.0203
ECOG PS ≥2 0–1	34/133295/689	25.6 (17.7–35.7)42.8 (38.1–47.9)	0.0002
irAEs of any grade – Multivariate analysis
Variable (comparator)	Coefficient	Std. Error	p-value
FHC (yes vs no)	0.3870	0.1498	0.0098
Primary tumor (NSCLC) Melanoma Kidney Others	-0.54560.6012–1.7464	-0.17980.20500.7519	-0.00240.00340.0202
Sex	−0.4783	0.1563	0.0022
N° of metastatic sites	−0.2747	0.1497	0.0666
ECOG-PS	−0.6687	0.2213	0.0025
Nagelkerke R2: 0.0945
irAEs of any grade – Multivariate analysis
Variable (comparator)	Coefficient	Std. Error	p-value
FHC (FHC-negative) FHC-low FHC-high	0.27950.7989	0.16020.2624	0.08100.0023
Primary tumor (NSCLC) Melanoma Kidney Others	-0.56140.6176–1.6780	-0.18030.20580.7520	0.00190.00270.0257
Sex	−0.4594	0.1571	0.0034
N° of metastatic sites	−0.2526	0.1505	0.0932
ECOG-PS	−0.6865	0.2222	0.0020
Nagelkerke R2: 0.1003

Discussion

It is well known that a small percentage (5 – 10%) of cancers are related to inherited mutations, which usually occurs with typical familial patterns.[11] Syndromes of inherited cancer predisposition are also one of the underlying mechanisms of MN development.[9] In our population, 44.3% and 14.9% of the patients had a positive FHC and diagnosis of MN, respectively; these findings are quite aligned to what was previously reported among cancer patients.[9,15,16]

In the preliminary analysis of the FAMI-L1 study, including the first 211 patients, FHC-positive patients had significantly higher ORR/DCR and significantly longer time to treatment failure and OS, when compared to FHC-negative patients.[13] No significant association was found between diagnosis of MN (all metachronous tumors) and clinical outcomes, with the exception of a higher DCR compared to MN-negative patients.[13] In this update, no significant associations were found between FHC, MN, and ORR; however from a speculative point of view, looking at the ORRs for FHC-negative, FHC-low, and FHC-high (32.7%, 36.7%, and 40.3%, respectively), we can notice that there is a trend to a direct proportionality, between the number of the positive familial lines and the ORR. Moreover, we can now confirm that MN does not affect PFS and OS, even considering the different analyses according to “burden of MN” and to synchronous/metachronous diagnosis of MN. Interestingly, only FHC-high patients had a significantly longer PFS and OS, when compared to FHC-negative patients, while no significant differences were found between FHC-low and FHC-negative, nor between FHC-positive and FHC-negative patients (analyzed overall, for lineal line only and for collateral line only, see Tables 3 and 4). The aim of the preliminary analysis was exploratory and purely descriptive. We did not compute the sample size nor performed subgroup analyses according to the “FHC burden.” In our opinion, the present results are more reliable, thanks to the bigger sample size and to the more appropriate analysis.

Although our preliminary results seem now mitigated,[13] this update seems to confirm our hypothesis that there is at least an association between the “FHC burden” and immunotherapy clinical outcomes, as if the more positive family lines, the greater the benefits. Looking at the hazard ratios, it is noticeable that they are concordantly higher in each comparison between FHC-high and FHC-negative patients than in those between FHC-low and FHC-negative. Intriguingly, adding the irAE analysis, we found a significantly higher incidence of any grade irAEs among FHC-positive patients (overall and for lineal line only) when compared to FHC-negative patients. Moreover, FHC-high patients had a significantly higher incidence of irAEs of any grade, when compared to FHC-negative patients, while FHC-low patients did not. It is also noticeable that the highest incidence of irAEs of any grade was reported among FHC-high patients (56%). In light of the emerging association between the development of irAEs and improved clinical outcomes with ICIs across different tumor types,[17-20] these findings would bear our hypothesis.

As previously stated, a history of MN is one of the clinical hallmarks of inherited cancer susceptibility, just as a positive FHC. Despite that, in our population, FHC and diagnosis of MN are not significantly related, and this is reflected in the different correlations that they have with clinical outcomes. Nevertheless, it is noticeable that patients with metachronous MN and MN-high ones had the highest ORRs (43.8% and 41.5%, respectively, see Table 2). Moreover, MN-high patients had at the same time the longest PFS and the shortest OS (compared to MN-negative and MN-low). We can thus speculate that a history of MN may underlie a kind of “immune sensitiveness,” demonstrated by good ORR and PFS to treatment, which is, however, outclassed by the prognostic weight that further malignancies have. We could assume that underlying mechanisms of MN and FHC are the same and lead to the same “immune sensitiveness,” but, on the other hand, patients developing MN surely have some negative prognostic features compared to FHC-positive patients.

The possible relationships between somatic alterations of genes belonging to DNA repair systems (such as homologous recombination, MMR, nucleotide excision repair, cell cycle checkpoints, Fanconi anemia DNA repair pathway, and others), “immune-sensitiveness,” and ICI clinical outcomes have been already explored.[21,22] Teo et al. reported a significant association between better clinical outcomes and somatic DDR gene alterations in a cohort of advanced urothelial cancer patients treated with atezolizumab.[23] Importantly, a higher response rate was found not only in patients whose tumors harbored known or likely deleterious DDR gene alterations but also in patients with DDR alterations of unknown significance when compared to patients whose tumors were wild-type for DDR genes.[23] In a study of single-agent pembrolizumab in docetaxel-refractory metastatic castration-resistant prostate cancer patients (mCRP), those with somatic mutations in BRCA1/2 or ATM (ataxia telangiectasia mutated) had higher response rates.[24]

That being said, if we are demonstrating that there is a proportional relationship between better clinical outcomes with anti-PD-1/PD-L1 inhibitors and “burden of familiarity,” we are allowed to think that DDR gene alterations (even of unknown clinical significance) might represent the underlying mechanism, which would make the cancer more “immune-sensitive,” maybe throughout an increased production of neo-antigens. However, assuming that FHC is a surrogate of DDR gene alterations, such alterations should not be found exclusively with somatic assays (on the tumor specimen), but also with germline assays. In a recent study of mCRP patients, treated with Durvalumab (an anti-PD-L1 checkpoint inhibitor) and olaparib, patients harboring somatic DDR gene alterations were more likely to benefit from the treatment.[25] Interestingly, four out of nine responders harbored germline alterations in DDR genes: one had a known deleterious mutation in NBN (nibrin) and 3 had frameshift BRCA2 indels.[25] We must, however, recognize that prostate cancer might be associated with specific syndromes of inherited cancer susceptibility;[26] thus it does not represent the most appropriate model to be extended to all other cancers. Nevertheless, it is conceivable that in case of a nonspecific high “burden of familiarity,” even without a peculiar familial pattern of cancers (as in the LS and HBOC syndrome), germline DDR gene alterations might be the substrate which explains the better outcomes with immunotherapy.

Among the limitations of the present study, we must cite the retrospective design, which exposes to selection biases, and the lack of centralized data review (imaging and toxicities). Our cohort was made of patients who received anti-PD-1/PD-L1 as different treatment lines; thus, we are not able to balance the expected immunosuppression induced by previous treatments. Even if the discussion about LS and HBOC syndrome was only a presupposition for our study, which “generated the hypothesis,” we must recognize that our patients were not affected by breast/ovarian cancers nor by colorectal cancer. Moreover, we do not have sufficient data for a proper counseling (e.g., age at diagnosis and type/number of malignancies among the relatives), nor regarding inherited cancer predisposition syndrome diagnosis and DDR gene alteration (including germline BRCA mutations or LS diagnosis).

Collecting family history is one of the first steps in filling each patient medical record. Even though the role of this information is often underestimated, it should be taken into consideration to properly evaluate the development risk of a wide range of diseases, including cancer.[27,28] We are a long way from saying that FHC could be used as a selection method for anti-PD-1/PD-L1 treatments. However, our study gives rise to interesting insights, which we intend to validate prospectively.

Conclusion

Thanks to the great sample size, this update confirms our preliminary findings. Particularly, FHC-high patients seem to benefit more than FHC-negative patients from PD-1/PD-L1 checkpoint inhibitors, suggesting that FHC might be the surrogate of some biological features related to the immune-sensitiveness. However, further investigations on the topic are still required.

Materials and methods

Patient eligibility

This multicenter retrospective observational study evaluated advanced cancer patients consecutively treated with single-agent anti-PD-1/PD-L1 immunotherapy from April 2015 to July 2018, regardless of the treatment line, at 17 Italian institutions (Supplementary file 1). Patients were eligible if they had histologically confirmed diagnosis of measurable stage IV cancer, with availability of records about FHC and history of eventual metachronous or synchronous MN. All patients provided written informed consent to the treatment with immunotherapy.

Study design

The primary endpoint of this analysis was to confirm the correlations between FHC and clinical outcomes; the secondary endpoint was to further investigate the relationships between diagnosis of MN and clinical outcomes. ORR, progression-free survival (PFS), OS, and incidence of any grade irAEs were evaluated. Patients were assessed with radiological imaging every 8–12 weeks using the RECIST (v. 1.0) criteria[29] according to the local clinical practice and national guidelines required by the Agenzia Italiana del Farmaco (AIFA). ORR was defined as the portion of patients experiencing an objective response (complete or partial response) as best response to immunotherapy. PFS was defined as the time from ICI treatment’s start to disease progression or death whichever occurred first; OS as the time from the beginning of treatment to death. For PFS as well as for OS, patients without events were considered as censored at the time of the last follow-up.

On the basis of our previous results,[13] and what was reported in other studies,[15,16,30] we hypothesized that 48% of the evaluated patients were FHC-positive, and 52% were FHC-negative. With a probability of Type I error of 0.05 and of Type II error of 0.20 and assuming a possible survival benefit for FHC-positive patients with a reduction of the risk of death by 70%, 247 total events were necessary and at least 712 patients had to be included. Univariate and multivariate analyses were performed using the following covariates: age (<70 vs ≥70 years old),[31-34] sex (male vs. female), primary tumor (NSCLC, melanoma, renal cell carcinoma, and others), Eastern Cooperative Oncology Group Performance Status (ECOG-PS) (0–1 vs ≥2), number of metastatic sites (≤2 vs >2), and treatment line (first vs nonfirst). χ2 test was used to correlate ORR and incidence of any grade irAEs with patient features.[35] χ2 test was also used to evaluate the correlation between FHC (yes vs no) and diagnosis of MN (yes vs no). Logistic regression was used for the multivariate analysis of ORR and incidence of irAEs of any grade.[36] Median PFS and median OS were evaluated using the Kaplan–Meier method.[37] The median period of follow-up was computed according to the reverse Kaplan–Meier method.[38] Cox proportional hazards model[39] was used to evaluate predictor variables in univariate and multivariate analysis for median PFS and median OS. Data cutoff period was October 2018. All statistical analyses were performed using MedCalc Statistical Software version 18.11.3 (MedCalc Software bvba, Ostend, Belgium; https://www.medcalc.org; 2019).

Definition of FHC and MNs

Given the lack of data availability in medical records, we did not use the traditional designations of first and second degree of relatedness for family history. Family history was collected in lineal (descendants or ascendants) and collateral lines (not-descentants/ascendants) till the second degree of relatedness (grandparents for lineal line and brothers/sisters for the collateral line). FHC was defined as “positive” with at least one diagnosis of cancer among the considered relatives. Patients were also categorized according to their FHC as follows: FHC-high (in case of cancer diagnoses in both the lineal and collateral family lines), FHC-low (in case of cancer diagnoses in only one family lines, lineal or collateral), and FHC-negative. Diagnosis of metachronous and/or synchronous MN was defined according to the international association of cancer registry (IARC/IACR) rules.[40] Patients were also categorized according to the diagnosis of MN as follows: MN-high (in case of more than two cancer diagnoses in their medical history), MN-low (in case of two cancer diagnoses in their medical history), and MN-negative. A further analysis was performed categorizing patients into synchronous MN, metachronous MN, and MN-negative.